PROBLEM: USB keyboards works only 4 per PC host port

PROBLEM: USB keyboards works only 4 per PC host port

[Aivils Stoss]

Hello All!

PROBLEM: USB keyboards works only 4 per PC host port.

I work for project which will use 15 - 25 keyboards for children teaching.
I discover current Linux 2.6.22 , 2.6.24, 2.6.26 dot not support more
than 4 keyboards per single PC host port. All plugged in keyboards
are listed as USB devices, listed as input devices, but capable to
send input events are only 4 keyboards, no matter where keyboards
are plugged in to HUB cascade. All plugged in keyboards switch LED's,
when i press NumLock.

I tested various usb-hub units and various host PC hardware, i even
replace hub power supplay units from 5V1A to 5V3A. All tested cases
give best results - 4 keyboards per PC host port and worstest - some PC
cannot do more than 8 keyboards at all.
I suppose this is Linux kernel bug because i test keyboards under
Windows, which support any schema of cascading of usb hubs.

I will send any log file if that is necessary, but trouble will pop up
in a row of kernels. 2.6.22 didn't have error messages. 2.6.24, 2.6.26
tend to total slow down with eternal reset messages:
Jul 25 07:16:00 awork kernel: input,hiddev97: USB HID v1.10 Mouse 
[USB-compliant keyboard] on usb-0000:00:1d.0-1.1.2
Jul 25 07:16:01 awork kernel: usb 2-1.1.1: reset low speed USB device using 
uhci_hcd and address 17
Jul 25 07:16:01 awork kernel: usb 2-1.1.2: reset low speed USB device using 
uhci_hcd and address 18
Jul 25 07:16:02 awork kernel: usb 2-1.1.1: reset low speed USB device using 
uhci_hcd and address 17


Best regards,
Aivils Stoss

Re: PROBLEM: USB keyboards works only 4 per PC host port

[Samuel Thibault]

Aivils Stoss, le Fri 08 Aug 2008 07:02:24 +0100, a écrit :
> I suppose this is Linux kernel bug because i test keyboards under
> Windows, which support any schema of cascading of usb hubs.

On the very same machine and hubs?

Samuel

Re: PROBLEM: USB keyboards works only 4 per PC host port

[Aivils Stoss]

On Saturday 09 August 2008 11:42:26 am Samuel Thibault wrote:
> Aivils Stoss, le Fri 08 Aug 2008 07:02:24 +0100, a écrit :
> > I suppose this is Linux kernel bug because i test keyboards under
> > Windows, which support any schema of cascading of usb hubs.
>
> On the very same machine and hubs?

Yes, on same machine. Under Windows i don't have evdev interface,
checked only how keypress go to console.
Of course to repeat a try You must have at least 5 keyboards and
1 7-port or 2 4-port hubs and kernel 2.6.22 and above. I allways
got result - 5th, 6th, 7th keyboard does not send events to console
or evdev.

>
> Samuel

Re: PROBLEM: USB keyboards works only 4 per PC host port

[Randy Dunlap]

[-- Attachment #1: Type: text/plain, Size: 1285 bytes --]

On Sun, 10 Aug 2008 04:08:37 +0100 Aivils Stoss wrote:

> On Saturday 09 August 2008 11:42:26 am Samuel Thibault wrote:
> > Aivils Stoss, le Fri 08 Aug 2008 07:02:24 +0100, a écrit :
> > > I suppose this is Linux kernel bug because i test keyboards under
> > > Windows, which support any schema of cascading of usb hubs.
> >
> > On the very same machine and hubs?
> 
> Yes, on same machine. Under Windows i don't have evdev interface,
> checked only how keypress go to console.
> Of course to repeat a try You must have at least 5 keyboards and
> 1 7-port or 2 4-port hubs and kernel 2.6.22 and above. I allways
> got result - 5th, 6th, 7th keyboard does not send events to console
> or evdev.


[adding linux-usb mailing list]

Hi,

I finally got 5 USB keyboards together along with 2 hubs.
I daisy-chained the hubs and connected 1 keyboard to the hub that is
on the notebook computer USB port, then I connected 4 keyboards to the
second hub.  They all worked for me, meaning that I can type on all of
them and have their characters show up on my console.

I'm testing with 2.6.7-rc2.
'usbtree' output of the USB subsystem is attached.


---
~Randy
Linux Plumbers Conference, 17-19 September 2008, Portland, Oregon USA
http://linuxplumbersconf.org/

[-- Attachment #2: usb-kbds.txt --]
[-- Type: text/plain, Size: 1890 bytes --]

/: Bus 05.Port 1: Dev 1, Class=root_hub, Drv=uhci_hcd/2p, 12M
/: Bus 04.Port 1: Dev 1, Class=root_hub, Drv=uhci_hcd/2p, 12M
    |_ Port 1: Dev 2, If 0, Prod=Microsoft IntelliMouse® Explorer, Class=HID, Drv=usbhid, 1.5M
    |_ Port 2: Dev 3, If 0, Prod=Generic USB Hub, Class=hub, Drv=hub/4p, 12M
        |_ Port 1: Dev 8, If 0, Prod=Mobility USB EasiDock 200, Class=hub, Drv=hub/9p, 12M
            |_ Port 1: Dev 17, If 0, Prod=API USB KB HUB, Class=hub, Drv=hub/3p, 12M
                |_ Port 1: Dev 18, If 0, Prod=API USB KB HUB, Class=HID, Drv=usbhid, 12M
                |_ Port 2: Dev 19, If 0, Prod=, Class=HID, Drv=usbhid, 1.5M
            |_ Port 2: Dev 14, If 0, Prod=USB Keyboard, Class=HID, Drv=usbhid, 1.5M
            |_ Port 2: Dev 14, If 1, Prod=, Class=HID, Drv=usbhid, 1.5M
            |_ Port 3: Dev 13, If 0, Prod=USB Multimedia Keyboard, Class=HID, Drv=usbhid, 1.5M
            |_ Port 3: Dev 13, If 1, Prod=, Class=HID, Drv=usbhid, 1.5M
            |_ Port 4: Dev 11, If 0, Prod=Dell USB Keyboard Hub, Class=hub, Drv=hub/3p, 12M
                |_ Port 1: Dev 12, If 0, Prod=Dell USB Keyboard, Class=HID, Drv=usbhid, 12M
                |_ Port 1: Dev 12, If 1, Prod=, Class=HID, Drv=usbhid, 12M
            |_ Port 8: Dev 9, If 0, Prod=Mobility PS/2 Keyboard And Mouse I/F, Class=HID, Drv=usbhid, 12M
            |_ Port 9: Dev 10, If 0, Prod=Mobility USB Serial Converter, Class=vend., Drv=none, 12M
        |_ Port 2: Dev 15, If 0, Prod=Multimedia Keyboard Hub, Class=hub, Drv=hub/3p, 12M
            |_ Port 1: Dev 16, If 0, Prod=Multimedia Keyboard Hub, Class=HID, Drv=usbhid, 12M
            |_ Port 1: Dev 16, If 1, Prod=, Class=HID, Drv=usbhid, 12M
/: Bus 03.Port 1: Dev 1, Class=root_hub, Drv=uhci_hcd/2p, 12M
/: Bus 02.Port 1: Dev 1, Class=root_hub, Drv=uhci_hcd/2p, 12M
/: Bus 01.Port 1: Dev 1, Class=root_hub, Drv=ehci_hcd/8p, 480M

Re: PROBLEM: USB keyboards works only 4 per PC host port

[Aivils Stoss]

On Friday 15 August 2008 7:19:48 am Randy Dunlap wrote:
> On Sun, 10 Aug 2008 04:08:37 +0100 Aivils Stoss wrote:
> > On Saturday 09 August 2008 11:42:26 am Samuel Thibault wrote:
> > > Aivils Stoss, le Fri 08 Aug 2008 07:02:24 +0100, a écrit :
> > > > I suppose this is Linux kernel bug because i test keyboards under
> > > > Windows, which support any schema of cascading of usb hubs.
> > >
> > > On the very same machine and hubs?
> >
> > Yes, on same machine. Under Windows i don't have evdev interface,
> > checked only how keypress go to console.
> > Of course to repeat a try You must have at least 5 keyboards and
> > 1 7-port or 2 4-port hubs and kernel 2.6.22 and above. I allways
> > got result - 5th, 6th, 7th keyboard does not send events to console
> > or evdev.
>
> [adding linux-usb mailing list]
>
> Hi,
>
> I finally got 5 USB keyboards together along with 2 hubs.
> I daisy-chained the hubs and connected 1 keyboard to the hub that is
> on the notebook computer USB port, then I connected 4 keyboards to the
> second hub.  They all worked for me, meaning that I can type on all of
> them and have their characters show up on my console.
>
> I'm testing with 2.6.7-rc2.
> 'usbtree' output of the USB subsystem is attached.

Yeah! 2.6.7 is a bit obsolete. At my end 2.6.15 support more than 4
keyboards per PC port , but mess up input when is plugged more than
9 keyboards. 10th is capable to send keypress events, but last pressed
key will be repeated until ctrl-c . 10th keyboard disturb an auto repeat of 
all keyboards.

Aivils

>
>
> ---
> ~Randy
> Linux Plumbers Conference, 17-19 September 2008, Portland, Oregon USA
> http://linuxplumbersconf.org/

Re: PROBLEM: USB keyboards works only 4 per PC host port

[Jiri Kosina]

On Mon, 18 Aug 2008, Aivils Stoss wrote:

>> I finally got 5 USB keyboards together along with 2 hubs. I 
>> daisy-chained the hubs and connected 1 keyboard to the hub that is on 
>> the notebook computer USB port, then I connected 4 keyboards to the 
>> second hub.  They all worked for me, meaning that I can type on all of 
>> them and have their characters show up on my console.
>> I'm testing with 2.6.7-rc2. 'usbtree' output of the USB subsystem is 
>> attached.
> Yeah! 2.6.7 is a bit obsolete.

I think that Randy really meant 2.6.27-rc2.

> At my end 2.6.15 support more than 4 keyboards per PC port , but mess up 
> input when is plugged more than 9 keyboards. 10th is capable to send 
> keypress events, but last pressed key will be repeated until ctrl-c . 
> 10th keyboard disturb an auto repeat of all keyboards.

Could you please verify with any more recent kernel than 2.6.15 and report 
back whether the issue is still present, please?

Also, is this bug specific to USB keyboards? i.e. if you for example plug 
in USB flash sticks instead of keyboards, do they all work correctly?

Thanks,

-- 
Jiri Kosina
SUSE Labs

Re: PROBLEM: USB keyboards works only 4 per PC host port

[Randy Dunlap]

On Mon, 18 Aug 2008 16:42:49 +0530 Aivils Stoss wrote:

> On Friday 15 August 2008 7:19:48 am Randy Dunlap wrote:
> > On Sun, 10 Aug 2008 04:08:37 +0100 Aivils Stoss wrote:
> > > On Saturday 09 August 2008 11:42:26 am Samuel Thibault wrote:
> > > > Aivils Stoss, le Fri 08 Aug 2008 07:02:24 +0100, a écrit :
> > > > > I suppose this is Linux kernel bug because i test keyboards under
> > > > > Windows, which support any schema of cascading of usb hubs.
> > > >
> > > > On the very same machine and hubs?
> > >
> > > Yes, on same machine. Under Windows i don't have evdev interface,
> > > checked only how keypress go to console.
> > > Of course to repeat a try You must have at least 5 keyboards and
> > > 1 7-port or 2 4-port hubs and kernel 2.6.22 and above. I allways
> > > got result - 5th, 6th, 7th keyboard does not send events to console
> > > or evdev.
> >
> > [adding linux-usb mailing list]
> >
> > Hi,
> >
> > I finally got 5 USB keyboards together along with 2 hubs.
> > I daisy-chained the hubs and connected 1 keyboard to the hub that is
> > on the notebook computer USB port, then I connected 4 keyboards to the
> > second hub.  They all worked for me, meaning that I can type on all of
> > them and have their characters show up on my console.
> >
> > I'm testing with 2.6.7-rc2.
> > 'usbtree' output of the USB subsystem is attached.
> 
> Yeah! 2.6.7 is a bit obsolete. At my end 2.6.15 support more than 4
> keyboards per PC port , but mess up input when is plugged more than
> 9 keyboards. 10th is capable to send keypress events, but last pressed
> key will be repeated until ctrl-c . 10th keyboard disturb an auto repeat of 
> all keyboards.

Sorry, my keyboard made a typo.  I'm testing with 2.6.27-rc2.

So the problem is now different from your original report, right?


What speed is the host port that the keyboards are connected to?
Could it be a USB bus bandwidth limitation?  (not that any code
checks for that)

I barely found 5 USB keyboards, so I surely can't test 10 or more.  ;)
I suppose that it will take some USB debug messages to attempt to see
what is going on...


---
~Randy
Linux Plumbers Conference, 17-19 September 2008, Portland, Oregon USA
http://linuxplumbersconf.org/

Re: PROBLEM: USB keyboards works only 4 per PC host port

[Aivils Stoss]

[-- Attachment #1: Type: text/plain, Size: 3643 bytes --]

On Monday 18 August 2008 8:44:32 pm Randy Dunlap wrote:
> On Mon, 18 Aug 2008 16:42:49 +0530 Aivils Stoss wrote:
> > On Friday 15 August 2008 7:19:48 am Randy Dunlap wrote:
> > > On Sun, 10 Aug 2008 04:08:37 +0100 Aivils Stoss wrote:
> > > > On Saturday 09 August 2008 11:42:26 am Samuel Thibault wrote:
> > > > > Aivils Stoss, le Fri 08 Aug 2008 07:02:24 +0100, a écrit :
> > > > > > I suppose this is Linux kernel bug because i test keyboards under
> > > > > > Windows, which support any schema of cascading of usb hubs.
> > > > >
> > > > > On the very same machine and hubs?
> > > >
> > > > Yes, on same machine. Under Windows i don't have evdev interface,
> > > > checked only how keypress go to console.
> > > > Of course to repeat a try You must have at least 5 keyboards and
> > > > 1 7-port or 2 4-port hubs and kernel 2.6.22 and above. I allways
> > > > got result - 5th, 6th, 7th keyboard does not send events to console
> > > > or evdev.
> > >
> > > [adding linux-usb mailing list]
> > >
> > > Hi,
> > >
> > > I finally got 5 USB keyboards together along with 2 hubs.
> > > I daisy-chained the hubs and connected 1 keyboard to the hub that is
> > > on the notebook computer USB port, then I connected 4 keyboards to the
> > > second hub.  They all worked for me, meaning that I can type on all of
> > > them and have their characters show up on my console.
> > >
> > > I'm testing with 2.6.7-rc2.
> > > 'usbtree' output of the USB subsystem is attached.
> >
> > Yeah! 2.6.7 is a bit obsolete. At my end 2.6.15 support more than 4
> > keyboards per PC port , but mess up input when is plugged more than
> > 9 keyboards. 10th is capable to send keypress events, but last pressed
> > key will be repeated until ctrl-c . 10th keyboard disturb an auto repeat
> > of all keyboards.
>
> Sorry, my keyboard made a typo.  I'm testing with 2.6.27-rc2.
>
> So the problem is now different from your original report, right?

No problem is same. Older kernels have another troubles.
2.6.22-1-mepis-smp
Quite stable. Have oops sometime inside evdev. Support up to 16 
USB keyboards, where 4 hubs are plugged into PC and 4 keyboards on
each hub. Any hub cascade support only 4 keyboards, where 5th or more
is registered but don't send input events. Oops inside evdev , when
USB keyboard unplugged. No slow down even all USB keyboards does
not work properly. My be this one support more than 16 keyboards, but
i don't have PC USB ports enough.

2.6.24-7
4 keyboards per port. If plug in 5th tend to total slow down with this one:
usb 2-1.1.1: reset low speed USB device using 
uhci_hcd and address 17
5th - means 5th keyboard in USB hub's cascade, which is plugged into
single PC USB port.

2.6.26
4 keyboards per port. If plug in 5th tend to total slow down.

2.6.27-rc3
Sorry Randy i cannot repeat Your achievement. This worse of all tested
kernels. I got working 3 USB keyboards, when i plug in 4th, all keyboards,
include PS/2 stop working. Kernel does not hung up. I can reach box
via net. dmesg , /proc/bus/input/devices attached. lsusb hung up.

Please notify me , if i should use 2.6.27-rc2 !

Aivils

>
>
> What speed is the host port that the keyboards are connected to?
> Could it be a USB bus bandwidth limitation?  (not that any code
> checks for that)
>
> I barely found 5 USB keyboards, so I surely can't test 10 or more.  ;)
> I suppose that it will take some USB debug messages to attempt to see
> what is going on...
>
>
> ---
> ~Randy
> Linux Plumbers Conference, 17-19 September 2008, Portland, Oregon USA
> http://linuxplumbersconf.org/



[-- Attachment #2: dmesg-2.6.27-rc3 --]
[-- Type: text/plain, Size: 30800 bytes --]

stem 00:12: iomem range 0xe0000-0xfffff could not be reserved
system 00:12: iomem range 0x100000-0x3f7fffff could not be reserved
pci 0000:00:1c.0: PCI bridge, secondary bus 0000:03
pci 0000:00:1c.0:   IO window: 0xe000-0xefff
pci 0000:00:1c.0:   MEM window: disabled
pci 0000:00:1c.0:   PREFETCH window: disabled
pci 0000:00:1c.1: PCI bridge, secondary bus 0000:02
pci 0000:00:1c.1:   IO window: 0xd000-0xdfff
pci 0000:00:1c.1:   MEM window: 0xdff00000-0xdfffffff
pci 0000:00:1c.1:   PREFETCH window: disabled
pci 0000:00:1e.0: PCI bridge, secondary bus 0000:01
pci 0000:00:1e.0:   IO window: 0xc000-0xcfff
pci 0000:00:1e.0:   MEM window: 0xdfe00000-0xdfefffff
pci 0000:00:1e.0:   PREFETCH window: disabled
pci 0000:00:1c.0: PCI INT A -> GSI 16 (level, low) -> IRQ 16
pci 0000:00:1c.0: setting latency timer to 64
pci 0000:00:1c.1: PCI INT B -> GSI 17 (level, low) -> IRQ 17
pci 0000:00:1c.1: setting latency timer to 64
pci 0000:00:1e.0: setting latency timer to 64
NET: Registered protocol family 2
IP route cache hash table entries: 32768 (order: 5, 131072 bytes)
TCP established hash table entries: 131072 (order: 8, 1048576 bytes)
TCP bind hash table entries: 65536 (order: 7, 524288 bytes)
TCP: Hash tables configured (established 131072 bind 65536)
TCP reno registered
NET: Registered protocol family 1
audit: initializing netlink socket (disabled)
type=2000 audit(1219146320.240:1): initialized
highmem bounce pool size: 64 pages
VFS: Disk quotas dquot_6.5.1
Dquot-cache hash table entries: 1024 (order 0, 4096 bytes)
NTFS driver 2.1.29 [Flags: R/W].
msgmni has been set to 1765
io scheduler noop registered
io scheduler anticipatory registered
io scheduler deadline registered
io scheduler cfq registered (default)
pci 0000:00:02.0: Boot video device
pci 0000:00:1d.0: uhci_check_and_reset_hc: cmd = 0x0000
pci 0000:00:1d.0: Performing full reset
pci 0000:00:1d.1: uhci_check_and_reset_hc: cmd = 0x0000
pci 0000:00:1d.1: Performing full reset
pci 0000:00:1d.2: uhci_check_and_reset_hc: cmd = 0x0000
pci 0000:00:1d.2: Performing full reset
pci 0000:00:1d.3: uhci_check_and_reset_hc: cmd = 0x0000
pci 0000:00:1d.3: Performing full reset
pcieport-driver 0000:00:1c.0: setting latency timer to 64
pcieport-driver 0000:00:1c.0: found MSI capability
pci_express 0000:00:1c.0:pcie00: allocate port service
pci_express 0000:00:1c.0:pcie02: allocate port service
pcieport-driver 0000:00:1c.1: setting latency timer to 64
pcieport-driver 0000:00:1c.1: found MSI capability
pci_express 0000:00:1c.1:pcie00: allocate port service
isapnp: Scanning for PnP cards...
Switched to high resolution mode on CPU 1
Switched to high resolution mode on CPU 0
isapnp: No Plug & Play device found
hpet_resources: 0xfed00000 is busy
Serial: 8250/16550 driver4 ports, IRQ sharing enabled
serial8250: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A
00:0e: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A
brd: module loaded
loop: module loaded
input: Macintosh mouse button emulation as /class/input/input0
Driver 'sd' needs updating - please use bus_type methods
Driver 'sr' needs updating - please use bus_type methods
ata_piix 0000:00:1f.1: version 2.12
ata_piix 0000:00:1f.1: PCI INT A -> GSI 22 (level, low) -> IRQ 22
ata_piix 0000:00:1f.1: setting latency timer to 64
scsi0 : ata_piix
scsi1 : ata_piix
ata1: PATA max UDMA/100 cmd 0x1f0 ctl 0x3f6 bmdma 0xffa0 irq 14
ata2: PATA max UDMA/100 cmd 0x170 ctl 0x376 bmdma 0xffa8 irq 15
ata1.00: ATA-7: ST3160215A, 3.AAD, max UDMA/100
ata1.00: 312581808 sectors, multi 16: LBA48 
ata1.00: configured for UDMA/100
scsi 0:0:0:0: Direct-Access     ATA      ST3160215A       3.AA PQ: 0 ANSI: 5
sd 0:0:0:0: [sda] 312581808 512-byte hardware sectors (160042 MB)
sd 0:0:0:0: [sda] Write Protect is off
sd 0:0:0:0: [sda] Mode Sense: 00 3a 00 00
sd 0:0:0:0: [sda] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
sd 0:0:0:0: [sda] 312581808 512-byte hardware sectors (160042 MB)
sd 0:0:0:0: [sda] Write Protect is off
sd 0:0:0:0: [sda] Mode Sense: 00 3a 00 00
sd 0:0:0:0: [sda] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
 sda: sda1 sda2 < > sda3 sda4
sd 0:0:0:0: [sda] Attached SCSI disk
sd 0:0:0:0: Attached scsi generic sg0 type 0
ata_piix 0000:00:1f.2: PCI INT B -> GSI 23 (level, low) -> IRQ 23
ata_piix 0000:00:1f.2: MAP [ P0 P2 P1 P3 ]
ata_piix 0000:00:1f.2: setting latency timer to 64
scsi2 : ata_piix
scsi3 : ata_piix
ata3: SATA max UDMA/133 cmd 0xb800 ctl 0xb400 bmdma 0xa400 irq 23
ata4: SATA max UDMA/133 cmd 0xb000 ctl 0xa800 bmdma 0xa408 irq 23
ata3.01: NODEV after polling detection
ata3.00: ATAPI: TSSTcorp CDDVDW SH-S203D, SB00, max UDMA/100
ata3.00: configured for UDMA/100
scsi 2:0:0:0: CD-ROM            TSSTcorp CDDVDW SH-S203D  SB00 PQ: 0 ANSI: 5
sr0: scsi3-mmc drive: 48x/48x writer dvd-ram cd/rw xa/form2 cdda tray
Uniform CD-ROM driver Revision: 3.20
sr 2:0:0:0: Attached scsi CD-ROM sr0
sr 2:0:0:0: Attached scsi generic sg1 type 5
ieee1394: raw1394: /dev/raw1394 device initialized
usbmon: debugfs is not available
ehci_hcd: block sizes: qh 128 qtd 96 itd 160 sitd 96
ehci_hcd 0000:00:1d.7: PCI INT A -> GSI 20 (level, low) -> IRQ 20
ehci_hcd 0000:00:1d.7: setting latency timer to 64
ehci_hcd 0000:00:1d.7: EHCI Host Controller
drivers/usb/core/inode.c: creating file 'devices'
drivers/usb/core/inode.c: creating file '001'
ehci_hcd 0000:00:1d.7: new USB bus registered, assigned bus number 1
ehci_hcd 0000:00:1d.7: reset hcs_params 0x104208 dbg=1 cc=4 pcc=2 ordered !ppc ports=8
ehci_hcd 0000:00:1d.7: reset hcc_params 6871 thresh 7 uframes 1024 64 bit addr
ehci_hcd 0000:00:1d.7: reset command 080002 (park)=0 ithresh=8 period=1024 Reset HALT
ehci_hcd 0000:00:1d.7: debug port 1
ehci_hcd 0000:00:1d.7: cache line size of 32 is not supported
ehci_hcd 0000:00:1d.7: supports USB remote wakeup
ehci_hcd 0000:00:1d.7: irq 20, io mem 0xdfdffc00
ehci_hcd 0000:00:1d.7: reset command 080002 (park)=0 ithresh=8 period=1024 Reset HALT
ehci_hcd 0000:00:1d.7: init command 010001 (park)=0 ithresh=1 period=1024 RUN
ehci_hcd 0000:00:1d.7: USB 2.0 started, EHCI 1.00, driver 10 Dec 2004
usb usb1: default language 0x0409
usb usb1: uevent
usb usb1: usb_probe_device
usb usb1: configuration #1 chosen from 1 choice
usb usb1: adding 1-0:1.0 (config #1, interface 0)
usb 1-0:1.0: uevent
hub 1-0:1.0: usb_probe_interface
hub 1-0:1.0: usb_probe_interface - got id
hub 1-0:1.0: USB hub found
hub 1-0:1.0: 8 ports detected
hub 1-0:1.0: standalone hub
hub 1-0:1.0: no power switching (usb 1.0)
hub 1-0:1.0: individual port over-current protection
hub 1-0:1.0: power on to power good time: 20ms
hub 1-0:1.0: local power source is good
hub 1-0:1.0: trying to enable port power on non-switchable hub
hub 1-0:1.0: state 7 ports 8 chg 0000 evt 0000
drivers/usb/core/inode.c: creating file '001'
usb usb1: New USB device found, idVendor=1d6b, idProduct=0002
usb usb1: New USB device strings: Mfr=3, Product=2, SerialNumber=1
usb usb1: Product: EHCI Host Controller
usb usb1: Manufacturer: Linux 2.6.27-rc3 ehci_hcd
usb usb1: SerialNumber: 0000:00:1d.7
Initializing USB Mass Storage driver...
usbcore: registered new interface driver usb-storage
USB Mass Storage support registered.
PNP: PS/2 Controller [PNP0303:PS2K,PNP0f03:PS2M] at 0x60,0x64 irq 1,12
serio: i8042 KBD port at 0x60,0x64 irq 1
serio: i8042 AUX port at 0x60,0x64 irq 12
mice: PS/2 mouse device common for all mice
usbcore: registered new interface driver appletouch
cpuidle: using governor ladder
cpuidle: using governor menu
TCP cubic registered
NET: Registered protocol family 17
Starting balanced_irq
Using IPI No-Shortcut mode
input: AT Translated Set 2 keyboard as /class/input/input1
EXT3-fs: mounted filesystem with ordered data mode.
VFS: Mounted root (ext3 filesystem) readonly.
Freeing unused kernel memory: 252k freed
kjournald starting.  Commit interval 5 seconds
usb usb1: uevent
usb 1-0:1.0: uevent
hub 1-0:1.0: hub_suspend
usb usb1: bus auto-suspend
ehci_hcd 0000:00:1d.7: suspend root hub
ACPI: SSDT 3F7AE0C0, 0214 (r1    AMI   CPU1PM        1 INTL 20060113)
processor ACPI0007:00: registered as cooling_device0
ACPI: Processor [CPU1] (supports 8 throttling states)
ACPI: SSDT 3F7AE2E0, 0143 (r1    AMI   CPU2PM        1 INTL 20060113)
processor ACPI0007:01: registered as cooling_device1
ACPI: Processor [CPU2] (supports 8 throttling states)
input: Power Button (FF) as /class/input/input2
ACPI: Power Button (FF) [PWRF]
input: Power Button (CM) as /class/input/input3
ACPI: Power Button (CM) [PWRB]
Linux agpgart interface v0.103
Atheros(R) L2 Ethernet Driver - version 2.0.4
Copyright (c) 2007 Atheros Corporation.
atl2 0000:02:00.0: PCI INT A -> GSI 17 (level, low) -> IRQ 17
atl2 0000:02:00.0: setting latency timer to 64
USB Universal Host Controller Interface driver v3.0
uhci_hcd 0000:00:1d.0: PCI INT A -> GSI 20 (level, low) -> IRQ 20
uhci_hcd 0000:00:1d.0: setting latency timer to 64
uhci_hcd 0000:00:1d.0: UHCI Host Controller
drivers/usb/core/inode.c: creating file '002'
uhci_hcd 0000:00:1d.0: new USB bus registered, assigned bus number 2
uhci_hcd 0000:00:1d.0: detected 2 ports
uhci_hcd 0000:00:1d.0: uhci_check_and_reset_hc: cmd = 0x0000
uhci_hcd 0000:00:1d.0: Performing full reset
uhci_hcd 0000:00:1d.0: supports USB remote wakeup
uhci_hcd 0000:00:1d.0: irq 20, io base 0x00009000
usb usb2: default language 0x0409
usb usb2: uevent
usb usb2: usb_probe_device
usb usb2: configuration #1 chosen from 1 choice
usb usb2: adding 2-0:1.0 (config #1, interface 0)
usb 2-0:1.0: uevent
hub 2-0:1.0: usb_probe_interface
hub 2-0:1.0: usb_probe_interface - got id
hub 2-0:1.0: USB hub found
hub 2-0:1.0: 2 ports detected
hub 2-0:1.0: standalone hub
hub 2-0:1.0: no power switching (usb 1.0)
hub 2-0:1.0: individual port over-current protection
hub 2-0:1.0: power on to power good time: 2ms
hub 2-0:1.0: local power source is good
hub 2-0:1.0: trying to enable port power on non-switchable hub
Floppy drive(s): fd0 is 1.44M
logips2pp: Detected unknown logitech mouse model 106
FDC 0 is a post-1991 82077
input: PC Speaker as /class/input/input4
drivers/usb/core/inode.c: creating file '001'
usb usb2: New USB device found, idVendor=1d6b, idProduct=0001
usb usb2: New USB device strings: Mfr=3, Product=2, SerialNumber=1
usb usb2: Product: UHCI Host Controller
usb usb2: Manufacturer: Linux 2.6.27-rc3 uhci_hcd
usb usb2: SerialNumber: 0000:00:1d.0
uhci_hcd 0000:00:1d.1: PCI INT B -> GSI 17 (level, low) -> IRQ 17
uhci_hcd 0000:00:1d.1: setting latency timer to 64
uhci_hcd 0000:00:1d.1: UHCI Host Controller
drivers/usb/core/inode.c: creating file '003'
uhci_hcd 0000:00:1d.1: new USB bus registered, assigned bus number 3
uhci_hcd 0000:00:1d.1: detected 2 ports
uhci_hcd 0000:00:1d.1: uhci_check_and_reset_hc: cmd = 0x0000
uhci_hcd 0000:00:1d.1: Performing full reset
uhci_hcd 0000:00:1d.1: supports USB remote wakeup
uhci_hcd 0000:00:1d.1: irq 17, io base 0x00009400
usb usb3: default language 0x0409
usb usb3: uevent
usb usb3: usb_probe_device
usb usb3: configuration #1 chosen from 1 choice
usb usb3: adding 3-0:1.0 (config #1, interface 0)
usb 3-0:1.0: uevent
hub 3-0:1.0: usb_probe_interface
hub 3-0:1.0: usb_probe_interface - got id
hub 3-0:1.0: USB hub found
hub 3-0:1.0: 2 ports detected
hub 3-0:1.0: standalone hub
hub 3-0:1.0: no power switching (usb 1.0)
hub 3-0:1.0: individual port over-current protection
hub 3-0:1.0: power on to power good time: 2ms
hub 3-0:1.0: local power source is good
hub 3-0:1.0: trying to enable port power on non-switchable hub
hub 2-0:1.0: state 7 ports 2 chg 0000 evt 0000
hub 3-0:1.0: state 7 ports 2 chg 0000 evt 0000
drivers/usb/core/inode.c: creating file '001'
usb usb3: New USB device found, idVendor=1d6b, idProduct=0001
usb usb3: New USB device strings: Mfr=3, Product=2, SerialNumber=1
usb usb3: Product: UHCI Host Controller
usb usb3: Manufacturer: Linux 2.6.27-rc3 uhci_hcd
usb usb3: SerialNumber: 0000:00:1d.1
agpgart-intel 0000:00:00.0: Intel 945G Chipset
agpgart-intel 0000:00:00.0: detected 7932K stolen memory
agpgart-intel 0000:00:00.0: AGP aperture is 256M @ 0xe0000000
uhci_hcd 0000:00:1d.2: PCI INT C -> GSI 18 (level, low) -> IRQ 18
uhci_hcd 0000:00:1d.2: setting latency timer to 64
uhci_hcd 0000:00:1d.2: UHCI Host Controller
drivers/usb/core/inode.c: creating file '004'
uhci_hcd 0000:00:1d.2: new USB bus registered, assigned bus number 4
uhci_hcd 0000:00:1d.2: detected 2 ports
uhci_hcd 0000:00:1d.2: uhci_check_and_reset_hc: cmd = 0x0000
uhci_hcd 0000:00:1d.2: Performing full reset
uhci_hcd 0000:00:1d.2: supports USB remote wakeup
uhci_hcd 0000:00:1d.2: irq 18, io base 0x00009800
usb usb4: default language 0x0409
usb usb4: uevent
usb usb4: usb_probe_device
usb usb4: configuration #1 chosen from 1 choice
usb usb4: adding 4-0:1.0 (config #1, interface 0)
usb 4-0:1.0: uevent
hub 4-0:1.0: usb_probe_interface
hub 4-0:1.0: usb_probe_interface - got id
hub 4-0:1.0: USB hub found
hub 4-0:1.0: 2 ports detected
hub 4-0:1.0: standalone hub
hub 4-0:1.0: no power switching (usb 1.0)
hub 4-0:1.0: individual port over-current protection
hub 4-0:1.0: power on to power good time: 2ms
hub 4-0:1.0: local power source is good
hub 4-0:1.0: trying to enable port power on non-switchable hub
hub 4-0:1.0: state 7 ports 2 chg 0000 evt 0000
drivers/usb/core/inode.c: creating file '001'
usb usb4: New USB device found, idVendor=1d6b, idProduct=0001
usb usb4: New USB device strings: Mfr=3, Product=2, SerialNumber=1
usb usb4: Product: UHCI Host Controller
usb usb4: Manufacturer: Linux 2.6.27-rc3 uhci_hcd
usb usb4: SerialNumber: 0000:00:1d.2
i801_smbus 0000:00:1f.3: PCI INT B -> GSI 23 (level, low) -> IRQ 23
uhci_hcd 0000:00:1d.3: PCI INT D -> GSI 19 (level, low) -> IRQ 19
uhci_hcd 0000:00:1d.3: setting latency timer to 64
uhci_hcd 0000:00:1d.3: UHCI Host Controller
drivers/usb/core/inode.c: creating file '005'
uhci_hcd 0000:00:1d.3: new USB bus registered, assigned bus number 5
uhci_hcd 0000:00:1d.3: detected 2 ports
uhci_hcd 0000:00:1d.3: uhci_check_and_reset_hc: cmd = 0x0000
uhci_hcd 0000:00:1d.3: Performing full reset
uhci_hcd 0000:00:1d.3: supports USB remote wakeup
uhci_hcd 0000:00:1d.3: irq 19, io base 0x0000a000
usb usb5: default language 0x0409
usb usb5: uevent
usb usb5: usb_probe_device
usb usb5: configuration #1 chosen from 1 choice
usb usb5: adding 5-0:1.0 (config #1, interface 0)
usb 5-0:1.0: uevent
hub 5-0:1.0: usb_probe_interface
hub 5-0:1.0: usb_probe_interface - got id
hub 5-0:1.0: USB hub found
hub 5-0:1.0: 2 ports detected
hub 5-0:1.0: standalone hub
hub 5-0:1.0: no power switching (usb 1.0)
hub 5-0:1.0: individual port over-current protection
hub 5-0:1.0: power on to power good time: 2ms
hub 5-0:1.0: local power source is good
hub 5-0:1.0: trying to enable port power on non-switchable hub
hub 5-0:1.0: state 7 ports 2 chg 0000 evt 0000
drivers/usb/core/inode.c: creating file '001'
usb usb5: New USB device found, idVendor=1d6b, idProduct=0001
usb usb5: New USB device strings: Mfr=3, Product=2, SerialNumber=1
usb usb5: Product: UHCI Host Controller
usb usb5: Manufacturer: Linux 2.6.27-rc3 uhci_hcd
usb usb5: SerialNumber: 0000:00:1d.3
ath5k_pci 0000:01:01.0: PCI INT A -> GSI 21 (level, low) -> IRQ 21
ath5k_pci 0000:01:01.0: registered as 'phy0'
phy0: Selected rate control algorithm 'pid'
ath5k phy0: Atheros AR2413 chip found (MAC: 0x78, PHY: 0x45)
udev: renamed network interface wlan0 to ath0
input: ImExPS/2 Logitech Explorer Mouse as /class/input/input5
EMU10K1X 0000:01:00.0: PCI INT A -> GSI 17 (level, low) -> IRQ 17
Model 1001 Rev 00000000 Serial 10011102
usb usb2: suspend_rh (auto-stop)
usb usb3: suspend_rh (auto-stop)
usb usb4: suspend_rh (auto-stop)
usb usb5: suspend_rh (auto-stop)
splashy[1466]: segfault at c ip b7fb73ce sp bfee7bd0 error 4 in libsplashy.so.1.0.0[b7fb5000+5000]
hub 2-0:1.0: hub_suspend
usb usb2: bus auto-suspend
usb usb2: suspend_rh
Adding 1959920k swap on /dev/sda3.  Priority:1 extents:1 across:1959920k
EXT3 FS on sda4, internal journal
hub 3-0:1.0: hub_suspend
usb usb3: bus auto-suspend
usb usb3: suspend_rh
hub 4-0:1.0: hub_suspend
usb usb4: bus auto-suspend
usb usb4: suspend_rh
hub 5-0:1.0: hub_suspend
usb usb5: bus auto-suspend
usb usb5: suspend_rh
device-mapper: ioctl: 4.14.0-ioctl (2008-04-23) initialised: dm-devel@redhat.com
Uniform Multi-Platform E-IDE driver
atl2: eth0 NIC Link is Up<100 Mbps Full Duplex>
NET: Registered protocol family 10
lo: Disabled Privacy Extensions
parport_pc 00:07: reported by Plug and Play ACPI
parport0: PC-style at 0x378 (0x778), irq 7, dma 3 [PCSPP,TRISTATE,COMPAT,EPP,ECP,DMA]
lp0: using parport0 (interrupt-driven).
ppdev: user-space parallel port driver
eth0: no IPv6 routers present
warning: `avahi-daemon' uses 32-bit capabilities (legacy support in use)
Bluetooth: Core ver 2.12
NET: Registered protocol family 31
Bluetooth: HCI device and connection manager initialized
Bluetooth: HCI socket layer initialized
Bluetooth: L2CAP ver 2.10
Bluetooth: L2CAP socket layer initialized
Bluetooth: HIDP (Human Interface Emulation) ver 1.2
usb usb5: usb auto-resume
usb usb5: wakeup_rh
hub 5-0:1.0: hub_resume
hub 5-0:1.0: state 7 ports 2 chg 0000 evt 0000
usb usb4: usb auto-resume
usb usb4: wakeup_rh
hub 4-0:1.0: hub_resume
hub 4-0:1.0: state 7 ports 2 chg 0000 evt 0000
usb usb2: usb auto-resume
usb usb2: wakeup_rh
hub 2-0:1.0: hub_resume
hub 2-0:1.0: state 7 ports 2 chg 0000 evt 0000
usb usb3: usb auto-resume
usb usb3: wakeup_rh
hub 3-0:1.0: hub_resume
hub 3-0:1.0: state 7 ports 2 chg 0000 evt 0000
usb usb1: usb auto-resume
ehci_hcd 0000:00:1d.7: resume root hub
hub 1-0:1.0: hub_resume
hub 1-0:1.0: state 7 ports 8 chg 0000 evt 0000
Bluetooth: RFCOMM socket layer initialized
Bluetooth: RFCOMM TTY layer initialized
Bluetooth: RFCOMM ver 1.10
powernow: This module only works with AMD K7 CPUs
usb usb5: suspend_rh (auto-stop)
ADDRCONF(NETDEV_UP): ath0: link is not ready
usb usb4: suspend_rh (auto-stop)
usb usb2: suspend_rh (auto-stop)
usb usb3: suspend_rh (auto-stop)
hub 5-0:1.0: hub_suspend
usb usb5: bus auto-suspend
usb usb5: suspend_rh
hub 4-0:1.0: hub_suspend
usb usb4: bus auto-suspend
usb usb4: suspend_rh
hub 2-0:1.0: hub_suspend
usb usb2: bus auto-suspend
usb usb2: suspend_rh
hub 3-0:1.0: hub_suspend
usb usb3: bus auto-suspend
usb usb3: suspend_rh
hub 1-0:1.0: hub_suspend
usb usb1: bus auto-suspend
ehci_hcd 0000:00:1d.7: suspend root hub
[drm] Initialized drm 1.1.0 20060810
pci 0000:00:02.0: PCI INT A -> GSI 16 (level, low) -> IRQ 16
pci 0000:00:02.0: setting latency timer to 64
[drm] Initialized i915 1.6.0 20060119 on minor 0
usb usb1: usb resume
ehci_hcd 0000:00:1d.7: resume root hub
hub 1-0:1.0: hub_resume
ehci_hcd 0000:00:1d.7: GetStatus port 4 status 001803 POWER sig=j CSC CONNECT
hub 1-0:1.0: port 4: status 0501 change 0001
hub 1-0:1.0: state 7 ports 8 chg 0010 evt 0000
hub 1-0:1.0: port 4, status 0501, change 0000, 480 Mb/s
ehci_hcd 0000:00:1d.7: port 4 full speed --> companion
ehci_hcd 0000:00:1d.7: GetStatus port 4 status 003801 POWER OWNER sig=j CONNECT
hub 1-0:1.0: port 4 not reset yet, waiting 50ms
usb usb3: usb resume
usb usb3: wakeup_rh
hub 3-0:1.0: hub_resume
uhci_hcd 0000:00:1d.1: port 2 portsc 0093,00
hub 3-0:1.0: port 2: status 0101 change 0001
ehci_hcd 0000:00:1d.7: GetStatus port 4 status 003002 POWER OWNER sig=se0 CSC
hub 1-0:1.0: state 7 ports 8 chg 0000 evt 0010
hub 3-0:1.0: state 7 ports 2 chg 0004 evt 0000
hub 3-0:1.0: port 2, status 0101, change 0000, 12 Mb/s
usb 3-2: new full speed USB device using uhci_hcd and address 2
usb 3-2: ep0 maxpacket = 8
usb 3-2: default language 0x0409
usb 3-2: uevent
usb 3-2: usb_probe_device
usb 3-2: configuration #1 chosen from 1 choice
usb 3-2: adding 3-2:1.0 (config #1, interface 0)
usb 3-2:1.0: uevent
hub 3-2:1.0: usb_probe_interface
hub 3-2:1.0: usb_probe_interface - got id
hub 3-2:1.0: USB hub found
hub 3-2:1.0: 4 ports detected
hub 3-2:1.0: standalone hub
hub 3-2:1.0: ganged power switching
hub 3-2:1.0: global over-current protection
hub 3-2:1.0: power on to power good time: 44ms
hub 3-2:1.0: local power source is good
hub 3-2:1.0: no over-current condition exists
hub 3-2:1.0: enabling power on all ports
hub 3-2:1.0: port 2: status 0101 change 0001
uhci_hcd 0000:00:1d.1: reserve dev 2 ep81-INT, period 128, phase 0, 12 us
drivers/usb/core/inode.c: creating file '002'
usb 3-2: New USB device found, idVendor=058f, idProduct=9254
usb 3-2: New USB device strings: Mfr=1, Product=2, SerialNumber=0
usb 3-2: Product: Generic USB Hub
usb 3-2: Manufacturer: ALCOR
hub 3-0:1.0: state 7 ports 2 chg 0000 evt 0004
hub 3-2:1.0: state 7 ports 4 chg 0004 evt 0000
hub 3-2:1.0: port 2, status 0101, change 0000, 12 Mb/s
usb 3-2.2: new full speed USB device using uhci_hcd and address 3
usb 3-2.2: ep0 maxpacket = 8
usb 3-2.2: default language 0x0409
usb 3-2.2: uevent
usb 3-2.2: usb_probe_device
usb 3-2.2: configuration #1 chosen from 1 choice
usb 3-2.2: adding 3-2.2:1.0 (config #1, interface 0)
usb 3-2.2:1.0: uevent
hub 3-2.2:1.0: usb_probe_interface
hub 3-2.2:1.0: usb_probe_interface - got id
hub 3-2.2:1.0: USB hub found
hub 3-2.2:1.0: 4 ports detected
hub 3-2.2:1.0: standalone hub
hub 3-2.2:1.0: individual port power switching
hub 3-2.2:1.0: individual port over-current protection
hub 3-2.2:1.0: power on to power good time: 44ms
hub 3-2.2:1.0: local power source is good
hub 3-2.2:1.0: enabling power on all ports
hub 3-2.2:1.0: port 1: status 0301 change 0001
hub 3-2.2:1.0: port 2: status 0301 change 0001
hub 3-2.2:1.0: port 3: status 0301 change 0001
hub 3-2.2:1.0: port 4: status 0301 change 0001
uhci_hcd 0000:00:1d.1: reserve dev 3 ep81-INT, period 128, phase 0, 12 us
drivers/usb/core/inode.c: creating file '003'
usb 3-2.2: New USB device found, idVendor=058f, idProduct=9254
usb 3-2.2: New USB device strings: Mfr=1, Product=2, SerialNumber=0
usb 3-2.2: Product: Generic USB Hub
usb 3-2.2: Manufacturer: ALCOR
hub 3-2:1.0: state 7 ports 4 chg 0000 evt 0004
hub 3-2.2:1.0: state 7 ports 4 chg 001e evt 0000
hub 3-2.2:1.0: port 1, status 0301, change 0000, 1.5 Mb/s
usb 3-2.2.1: new low speed USB device using uhci_hcd and address 4
usb 3-2.2.1: skipped 1 descriptor after interface
usb 3-2.2.1: skipped 1 descriptor after interface
usb 3-2.2.1: default language 0x0409
usb 3-2.2.1: uevent
usb 3-2.2.1: usb_probe_device
usb 3-2.2.1: configuration #1 chosen from 1 choice
usb 3-2.2.1: adding 3-2.2.1:1.0 (config #1, interface 0)
usb 3-2.2.1:1.0: uevent
usb 3-2.2.1: adding 3-2.2.1:1.1 (config #1, interface 1)
usb 3-2.2.1:1.1: uevent
drivers/usb/core/inode.c: creating file '004'
usb 3-2.2.1: New USB device found, idVendor=0a81, idProduct=0101
usb 3-2.2.1: New USB device strings: Mfr=1, Product=2, SerialNumber=0
usb 3-2.2.1: Product: USB Keyboard
usb 3-2.2.1: Manufacturer: CHESEN
hub 3-2.2:1.0: port 2, status 0301, change 0000, 1.5 Mb/s
usb 3-2.2.2: new low speed USB device using uhci_hcd and address 5
usb 3-2.2.2: skipped 1 descriptor after interface
usb 3-2.2.2: skipped 1 descriptor after interface
usb 3-2.2.2: default language 0x0409
usb 3-2.2.2: uevent
usb 3-2.2.2: usb_probe_device
usb 3-2.2.2: configuration #1 chosen from 1 choice
usb 3-2.2.2: adding 3-2.2.2:1.0 (config #1, interface 0)
usb 3-2.2.2:1.0: uevent
usb 3-2.2.2: adding 3-2.2.2:1.1 (config #1, interface 1)
usb 3-2.2.2:1.1: uevent
drivers/usb/core/inode.c: creating file '005'
usb 3-2.2.2: New USB device found, idVendor=0a81, idProduct=0101
usb 3-2.2.2: New USB device strings: Mfr=1, Product=2, SerialNumber=0
usb 3-2.2.2: Product: USB Keyboard
usb 3-2.2.2: Manufacturer: CHESEN
hub 3-2.2:1.0: port 3, status 0301, change 0000, 1.5 Mb/s
usb 3-2.2.3: new low speed USB device using uhci_hcd and address 6
usb 3-2.2.3: skipped 1 descriptor after interface
usb 3-2.2.3: skipped 1 descriptor after interface
usb 3-2.2.3: default language 0x0409
usb 3-2.2.3: uevent
usb 3-2.2.3: usb_probe_device
usb 3-2.2.3: configuration #1 chosen from 1 choice
usb 3-2.2.3: adding 3-2.2.3:1.0 (config #1, interface 0)
usb 3-2.2.3:1.0: uevent
usb 3-2.2.3: adding 3-2.2.3:1.1 (config #1, interface 1)
usb 3-2.2.3:1.1: uevent
drivers/usb/core/inode.c: creating file '006'
usb 3-2.2.3: New USB device found, idVendor=0a81, idProduct=0101
usb 3-2.2.3: New USB device strings: Mfr=1, Product=2, SerialNumber=0
usb 3-2.2.3: Product: USB Keyboard
usb 3-2.2.3: Manufacturer: CHESEN
hub 3-2.2:1.0: port 4, status 0301, change 0000, 1.5 Mb/s
usb 3-2.2.4: new low speed USB device using uhci_hcd and address 7
usb 3-2.2.4: skipped 1 descriptor after interface
usb 3-2.2.4: skipped 1 descriptor after interface
usb 3-2.2.4: default language 0x0409
usb 3-2.2.4: uevent
usb 3-2.2.4: usb_probe_device
usb 3-2.2.4: configuration #1 chosen from 1 choice
usb 3-2.2.4: adding 3-2.2.4:1.0 (config #1, interface 0)
usb 3-2.2.4:1.0: uevent
usb 3-2.2.4: adding 3-2.2.4:1.1 (config #1, interface 1)
usb 3-2.2.4:1.1: uevent
drivers/usb/core/inode.c: creating file '007'
usb 3-2.2.4: New USB device found, idVendor=0a81, idProduct=0101
usb 3-2.2.4: New USB device strings: Mfr=1, Product=2, SerialNumber=0
usb 3-2.2.4: Product: USB Keyboard
usb 3-2.2.4: Manufacturer: CHESEN
usbcore: registered new interface driver hiddev
usbhid 3-2.2.1:1.0: usb_probe_interface
usbhid 3-2.2.1:1.0: usb_probe_interface - got id
hub 3-2.2:1.0: state 7 ports 4 chg 0000 evt 0008
input: CHESEN USB Keyboard as /class/input/input6
uhci_hcd 0000:00:1d.1: reserve dev 4 ep81-INT, period 8, phase 4, 118 us
input: USB HID v1.10 Keyboard [CHESEN USB Keyboard] on usb-0000:00:1d.1-2.2.1
usbhid 3-2.2.1:1.1: usb_probe_interface
usbhid 3-2.2.1:1.1: usb_probe_interface - got id
input: CHESEN USB Keyboard as /class/input/input7
uhci_hcd 0000:00:1d.1: reserve dev 4 ep82-INT, period 8, phase 4, 118 us
input: USB HID v1.10 Device [CHESEN USB Keyboard] on usb-0000:00:1d.1-2.2.1
usbhid 3-2.2.2:1.0: usb_probe_interface
usbhid 3-2.2.2:1.0: usb_probe_interface - got id
input: CHESEN USB Keyboard as /class/input/input8
uhci_hcd 0000:00:1d.1: reserve dev 5 ep81-INT, period 8, phase 4, 118 us
input: USB HID v1.10 Keyboard [CHESEN USB Keyboard] on usb-0000:00:1d.1-2.2.2
usbhid 3-2.2.2:1.1: usb_probe_interface
usbhid 3-2.2.2:1.1: usb_probe_interface - got id
input: CHESEN USB Keyboard as /class/input/input9
uhci_hcd 0000:00:1d.1: reserve dev 5 ep82-INT, period 8, phase 4, 118 us
input: USB HID v1.10 Device [CHESEN USB Keyboard] on usb-0000:00:1d.1-2.2.2
usbhid 3-2.2.3:1.0: usb_probe_interface
usbhid 3-2.2.3:1.0: usb_probe_interface - got id
input: CHESEN USB Keyboard as /class/input/input10
uhci_hcd 0000:00:1d.1: reserve dev 6 ep81-INT, period 8, phase 4, 118 us
input: USB HID v1.10 Keyboard [CHESEN USB Keyboard] on usb-0000:00:1d.1-2.2.3
usbhid 3-2.2.3:1.1: usb_probe_interface
usbhid 3-2.2.3:1.1: usb_probe_interface - got id
input: CHESEN USB Keyboard as /class/input/input11
uhci_hcd 0000:00:1d.1: reserve dev 6 ep82-INT, period 8, phase 4, 118 us
input: USB HID v1.10 Device [CHESEN USB Keyboard] on usb-0000:00:1d.1-2.2.3
usbhid 3-2.2.4:1.0: usb_probe_interface
usbhid 3-2.2.4:1.0: usb_probe_interface - got id
input: CHESEN USB Keyboard as /class/input/input12
uhci_hcd 0000:00:1d.1: reserve dev 7 ep81-INT, period 8, phase 4, 118 us
input: USB HID v1.10 Keyboard [CHESEN USB Keyboard] on usb-0000:00:1d.1-2.2.4
usbhid 3-2.2.4:1.1: usb_probe_interface
usbhid 3-2.2.4:1.1: usb_probe_interface - got id
input: CHESEN USB Keyboard as /class/input/input13
uhci_hcd 0000:00:1d.1: bandwidth allocation failed: period 8, phase 4, 826 + 118 us
input: USB HID v1.10 Device [CHESEN USB Keyboard] on usb-0000:00:1d.1-2.2.4
usbcore: registered new interface driver usbhid
usbhid: v2.6:USB HID core driver
uhci_hcd 0000:00:1d.1: bandwidth allocation failed: period 8, phase 4, 826 + 118 us
uhci_hcd 0000:00:1d.1: bandwidth allocation failed: period 8, phase 4, 826 + 118 us
uhci_hcd 0000:00:1d.1: bandwidth allocation failed: period 8, phase 4, 826 + 118 us
uhci_hcd 0000:00:1d.1: bandwidth allocation failed: period 8, phase 4, 826 + 118 us
uhci_hcd 0000:00:1d.1: bandwidth allocation failed: period 8, phase 4, 826 + 118 us
uhci_hcd 0000:00:1d.1: bandwidth allocation failed: period 8, phase 4, 826 + 118 us
uhci_hcd 0000:00:1d.1: bandwidth allocation failed: period 8, phase 4, 826 + 118 us
uhci_hcd 0000:00:1d.1: bandwidth allocation failed: period 8, phase 4, 826 + 118 us
hub 1-0:1.0: hub_suspend
usb usb1: bus auto-suspend
ehci_hcd 0000:00:1d.7: suspend root hub
uhci_hcd 0000:00:1d.1: bandwidth allocation failed: period 8, phase 4, 826 + 118 us
uhci_hcd 0000:00:1d.1: bandwidth allocation failed: period 8, phase 4, 826 + 118 us
uhci_hcd 0000:00:1d.1: bandwidth allocation failed: period 8, phase 4, 826 + 118 us
uhci_hcd 0000:00:1d.1: bandwidth allocation failed: period 8, phase 4, 826 + 118 us
uhci_hcd 0000:00:1d.1: release dev 7 ep81-INT, period 8, phase 4, 118 us
hub 3-2.2:1.0: state 7 ports 4 chg 0000 evt 0010
hub 3-2.2:1.0: state 7 ports 4 chg 0000 evt 0010
usb 3-2.2.4: reset low speed USB device using uhci_hcd and address 7
hub 3-2.2:1.0: state 7 ports 4 chg 0000 evt 0010
uhci_hcd 0000:00:1d.1: reserve dev 7 ep82-INT, period 8, phase 4, 118 us
uhci_hcd 0000:00:1d.1: bandwidth allocation failed: period 8, phase 4, 826 + 118 us
usbhid 3-2.2.4:1.0: forced unbind
usbhid 3-2.2.4:1.0: usb_probe_interface
usbhid 3-2.2.4:1.0: usb_probe_interface - got id
input: CHESEN USB Keyboard as /class/input/input14
uhci_hcd 0000:00:1d.1: bandwidth allocation failed: period 8, phase 4, 826 + 118 us
input: USB HID v1.10 Keyboard [CHESEN USB Keyboard] on usb-0000:00:1d.1-2.2.4
uhci_hcd 0000:00:1d.1: bandwidth allocation failed: period 8, phase 4, 826 + 118 us
uhci_hcd 0000:00:1d.1: bandwidth allocation failed: period 8, phase 4, 826 + 118 us
uhci_hcd 0000:00:1d.1: bandwidth allocation failed: period 8, phase 4, 826 + 118 us
uhci_hcd 0000:00:1d.1: bandwidth allocation failed: period 8, phase 4, 826 + 118 us
uhci_hcd 0000:00:1d.1: bandwidth allocation failed: period 8, phase 4, 826 + 118 us
uhci_hcd 0000:00:1d.1: bandwidth allocation failed: period 8, phase 4, 826 + 118 us
uhci_hcd 0000:00:1d.1: bandwidth allocation failed: period 8, phase 4, 826 + 118 us
uhci_hcd 0000:00:1d.1: bandwidth allocation failed: period 8, phase 4, 826 + 118 us
uhci_hcd 0000:00:1d.1: bandwidth allocation failed: period 8, phase 4, 826 + 118 us
uhci_hcd 0000:00:1d.1: bandwidth allocation failed: period 8, phase 4, 826 + 118 us
uhci_hcd 0000:00:1d.1: bandwidth allocation failed: period 8, phase 4, 826 + 118 us
uhci_hcd 0000:00:1d.1: bandwidth allocation failed: period 8, phase 4, 826 + 118 us
uhci_hcd 0000:00:1d.1: release dev 7 ep82-INT, period 8, phase 4, 118 us
hub 3-2.2:1.0: state 7 ports 4 chg 0000 evt 0010
hub 3-2.2:1.0: state 7 ports 4 chg 0000 evt 0010
usb 3-2.2.4: reset low speed USB device using uhci_hcd and address 7
hub 3-2.2:1.0: state 7 ports 4 chg 0000 evt 0010
hub 3-2.2:1.0: state 7 ports 4 chg 0000 evt 0010
uhci_hcd 0000:00:1d.1: reserve dev 7 ep82-INT, period 8, phase 4, 118 us
uhci_hcd 0000:00:1d.1: bandwidth allocation failed: period 8, phase 4, 826 + 118 us
usbhid 3-2.2.4:1.0: forced unbind

[-- Attachment #3: input-devices.txt --]
[-- Type: text/plain, Size: 3425 bytes --]

I: Bus=0017 Vendor=0001 Product=0001 Version=0100
N: Name="Macintosh mouse button emulation"
P: Phys=
S: Sysfs=/class/input/input0
U: Uniq=
H: Handlers=mouse0 event0 
B: EV=7
B: KEY=70000 0 0 0 0 0 0 0 0
B: REL=3

I: Bus=0011 Vendor=0001 Product=0001 Version=ab41
N: Name="AT Translated Set 2 keyboard"
P: Phys=isa0060/serio0/input0
S: Sysfs=/class/input/input1
U: Uniq=
H: Handlers=kbd event1 
B: EV=120013
B: KEY=4 2000000 3803078 f800d001 feffffdf ffefffff ffffffff fffffffe
B: MSC=10
B: LED=7

I: Bus=0019 Vendor=0000 Product=0002 Version=0000
N: Name="Power Button (FF)"
P: Phys=LNXPWRBN/button/input0
S: Sysfs=/class/input/input2
U: Uniq=
H: Handlers=kbd event2 
B: EV=3
B: KEY=100000 0 0 0

I: Bus=0019 Vendor=0000 Product=0001 Version=0000
N: Name="Power Button (CM)"
P: Phys=PNP0C0C/button/input0
S: Sysfs=/class/input/input3
U: Uniq=
H: Handlers=kbd event3 
B: EV=3
B: KEY=100000 0 0 0

I: Bus=0010 Vendor=001f Product=0001 Version=0100
N: Name="PC Speaker"
P: Phys=isa0061/input0
S: Sysfs=/class/input/input4
U: Uniq=
H: Handlers=kbd event4 
B: EV=40001
B: SND=6

I: Bus=0011 Vendor=0002 Product=0006 Version=006a
N: Name="ImExPS/2 Logitech Explorer Mouse"
P: Phys=isa0060/serio1/input0
S: Sysfs=/class/input/input5
U: Uniq=
H: Handlers=mouse1 event5 
B: EV=7
B: KEY=1f0000 0 0 0 0 0 0 0 0
B: REL=143

I: Bus=0003 Vendor=0a81 Product=0101 Version=0110
N: Name="CHESEN USB Keyboard"
P: Phys=usb-0000:00:1d.3-2.4.1/input0
S: Sysfs=/class/input/input10
U: Uniq=
H: Handlers=kbd event6 
B: EV=120013
B: KEY=10000 7 ff9f207a c14057ff febeffdf ffefffff ffffffff fffffffe
B: MSC=10
B: LED=1f

I: Bus=0003 Vendor=0a81 Product=0101 Version=0110
N: Name="CHESEN USB Keyboard"
P: Phys=usb-0000:00:1d.3-2.4.1/input1
S: Sysfs=/class/input/input11
U: Uniq=
H: Handlers=kbd event7 
B: EV=13
B: KEY=2020000 3878 d801d001 1e0000 0 0 0
B: MSC=10

I: Bus=0003 Vendor=0a81 Product=0101 Version=0110
N: Name="CHESEN USB Keyboard"
P: Phys=usb-0000:00:1d.3-2.4.2/input0
S: Sysfs=/class/input/input12
U: Uniq=
H: Handlers=kbd event8 
B: EV=120013
B: KEY=10000 7 ff9f207a c14057ff febeffdf ffefffff ffffffff fffffffe
B: MSC=10
B: LED=1f

I: Bus=0003 Vendor=0a81 Product=0101 Version=0110
N: Name="CHESEN USB Keyboard"
P: Phys=usb-0000:00:1d.3-2.4.2/input1
S: Sysfs=/class/input/input13
U: Uniq=
H: Handlers=kbd event9 
B: EV=13
B: KEY=2020000 3878 d801d001 1e0000 0 0 0
B: MSC=10

I: Bus=0003 Vendor=0a81 Product=0101 Version=0110
N: Name="CHESEN USB Keyboard"
P: Phys=usb-0000:00:1d.3-2.4.3/input0
S: Sysfs=/class/input/input14
U: Uniq=
H: Handlers=kbd event10 
B: EV=120013
B: KEY=10000 7 ff9f207a c14057ff febeffdf ffefffff ffffffff fffffffe
B: MSC=10
B: LED=1f

I: Bus=0003 Vendor=0a81 Product=0101 Version=0110
N: Name="CHESEN USB Keyboard"
P: Phys=usb-0000:00:1d.3-2.4.3/input1
S: Sysfs=/class/input/input15
U: Uniq=
H: Handlers=kbd event11 
B: EV=13
B: KEY=2020000 3878 d801d001 1e0000 0 0 0
B: MSC=10

I: Bus=0003 Vendor=0a81 Product=0101 Version=0110
N: Name="CHESEN USB Keyboard"
P: Phys=usb-0000:00:1d.3-2.4.4/input1
S: Sysfs=/class/input/input17
U: Uniq=
H: Handlers=kbd event13 
B: EV=13
B: KEY=2020000 3878 d801d001 1e0000 0 0 0
B: MSC=10

I: Bus=0003 Vendor=0a81 Product=0101 Version=0110
N: Name="CHESEN USB Keyboard"
P: Phys=usb-0000:00:1d.3-2.4.4/input0
S: Sysfs=/class/input/input18
U: Uniq=
H: Handlers=kbd event12 
B: EV=120013
B: KEY=10000 7 ff9f207a c14057ff febeffdf ffefffff ffffffff fffffffe
B: MSC=10
B: LED=1f


[-- Attachment #4: lsusb_-v_2.6.22-mepis-smp --]
[-- Type: text/plain, Size: 27017 bytes --]


Bus 003 Device 001: ID 0000:0000  
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               1.10
  bDeviceClass            9 Hub
  bDeviceSubClass         0 Unused
  bDeviceProtocol         0 Full speed hub
  bMaxPacketSize0        64
  idVendor           0x0000 
  idProduct          0x0000 
  bcdDevice            2.06
  iManufacturer           3 Linux 2.6.22-1-mepis-smp uhci_hcd
  iProduct                2 UHCI Host Controller
  iSerial                 1 0000:00:1d.1
  bNumConfigurations      1
  Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength           25
    bNumInterfaces          1
    bConfigurationValue     1
    iConfiguration          0 
    bmAttributes         0xe0
      Self Powered
      Remote Wakeup
    MaxPower                0mA
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       0
      bNumEndpoints           1
      bInterfaceClass         9 Hub
      bInterfaceSubClass      0 Unused
      bInterfaceProtocol      0 Full speed hub
      iInterface              0 
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x81  EP 1 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0002  1x 2 bytes
        bInterval             255
Hub Descriptor:
  bLength               9
  bDescriptorType      41
  nNbrPorts             2
  wHubCharacteristic 0x000a
    No power switching (usb 1.0)
    Per-port overcurrent protection
  bPwrOn2PwrGood        1 * 2 milli seconds
  bHubContrCurrent      0 milli Ampere
  DeviceRemovable    0x00
  PortPwrCtrlMask    0xff
 Hub Port Status:
   Port 1: 0000.0100 power
   Port 2: 0000.0100 power
Device Status:     0x0003
  Self Powered
  Remote Wakeup Enabled

Bus 005 Device 007: ID 0a81:0101 Chesen Electronics Corp. Keyboard
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               1.10
  bDeviceClass            0 (Defined at Interface level)
  bDeviceSubClass         0 
  bDeviceProtocol         0 
  bMaxPacketSize0         8
  idVendor           0x0a81 Chesen Electronics Corp.
  idProduct          0x0101 Keyboard
  bcdDevice            1.10
  iManufacturer           1 CHESEN
  iProduct                2 USB Keyboard
  iSerial                 0 
  bNumConfigurations      1
  Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength           59
    bNumInterfaces          2
    bConfigurationValue     1
    iConfiguration          0 
    bmAttributes         0xa0
      (Bus Powered)
      Remote Wakeup
    MaxPower              100mA
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       0
      bNumEndpoints           1
      bInterfaceClass         3 Human Interface Devices
      bInterfaceSubClass      1 Boot Interface Subclass
      bInterfaceProtocol      1 Keyboard
      iInterface              0 
        HID Device Descriptor:
          bLength                 9
          bDescriptorType        33
          bcdHID               1.10
          bCountryCode           33 US
          bNumDescriptors         1
          bDescriptorType        34 Report
          wDescriptorLength      65
         Report Descriptors: 
           ** UNAVAILABLE **
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x81  EP 1 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0008  1x 8 bytes
        bInterval              10
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        1
      bAlternateSetting       0
      bNumEndpoints           1
      bInterfaceClass         3 Human Interface Devices
      bInterfaceSubClass      0 No Subclass
      bInterfaceProtocol      0 None
      iInterface              0 
        HID Device Descriptor:
          bLength                 9
          bDescriptorType        33
          bcdHID               1.10
          bCountryCode           33 US
          bNumDescriptors         1
          bDescriptorType        34 Report
          wDescriptorLength     102
         Report Descriptors: 
           ** UNAVAILABLE **
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x82  EP 2 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0008  1x 8 bytes
        bInterval              10
Device Status:     0x0000
  (Bus Powered)

Bus 005 Device 006: ID 0a81:0101 Chesen Electronics Corp. Keyboard
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               1.10
  bDeviceClass            0 (Defined at Interface level)
  bDeviceSubClass         0 
  bDeviceProtocol         0 
  bMaxPacketSize0         8
  idVendor           0x0a81 Chesen Electronics Corp.
  idProduct          0x0101 Keyboard
  bcdDevice            1.10
  iManufacturer           1 CHESEN
  iProduct                2 USB Keyboard
  iSerial                 0 
  bNumConfigurations      1
  Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength           59
    bNumInterfaces          2
    bConfigurationValue     1
    iConfiguration          0 
    bmAttributes         0xa0
      (Bus Powered)
      Remote Wakeup
    MaxPower              100mA
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       0
      bNumEndpoints           1
      bInterfaceClass         3 Human Interface Devices
      bInterfaceSubClass      1 Boot Interface Subclass
      bInterfaceProtocol      1 Keyboard
      iInterface              0 
        HID Device Descriptor:
          bLength                 9
          bDescriptorType        33
          bcdHID               1.10
          bCountryCode           33 US
          bNumDescriptors         1
          bDescriptorType        34 Report
          wDescriptorLength      65
         Report Descriptors: 
           ** UNAVAILABLE **
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x81  EP 1 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0008  1x 8 bytes
        bInterval              10
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        1
      bAlternateSetting       0
      bNumEndpoints           1
      bInterfaceClass         3 Human Interface Devices
      bInterfaceSubClass      0 No Subclass
      bInterfaceProtocol      0 None
      iInterface              0 
        HID Device Descriptor:
          bLength                 9
          bDescriptorType        33
          bcdHID               1.10
          bCountryCode           33 US
          bNumDescriptors         1
          bDescriptorType        34 Report
          wDescriptorLength     102
         Report Descriptors: 
           ** UNAVAILABLE **
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x82  EP 2 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0008  1x 8 bytes
        bInterval              10
Device Status:     0x0000
  (Bus Powered)

Bus 005 Device 005: ID 0a81:0101 Chesen Electronics Corp. Keyboard
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               1.10
  bDeviceClass            0 (Defined at Interface level)
  bDeviceSubClass         0 
  bDeviceProtocol         0 
  bMaxPacketSize0         8
  idVendor           0x0a81 Chesen Electronics Corp.
  idProduct          0x0101 Keyboard
  bcdDevice            1.10
  iManufacturer           1 CHESEN
  iProduct                2 USB Keyboard
  iSerial                 0 
  bNumConfigurations      1
  Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength           59
    bNumInterfaces          2
    bConfigurationValue     1
    iConfiguration          0 
    bmAttributes         0xa0
      (Bus Powered)
      Remote Wakeup
    MaxPower              100mA
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       0
      bNumEndpoints           1
      bInterfaceClass         3 Human Interface Devices
      bInterfaceSubClass      1 Boot Interface Subclass
      bInterfaceProtocol      1 Keyboard
      iInterface              0 
        HID Device Descriptor:
          bLength                 9
          bDescriptorType        33
          bcdHID               1.10
          bCountryCode           33 US
          bNumDescriptors         1
          bDescriptorType        34 Report
          wDescriptorLength      65
         Report Descriptors: 
           ** UNAVAILABLE **
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x81  EP 1 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0008  1x 8 bytes
        bInterval              10
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        1
      bAlternateSetting       0
      bNumEndpoints           1
      bInterfaceClass         3 Human Interface Devices
      bInterfaceSubClass      0 No Subclass
      bInterfaceProtocol      0 None
      iInterface              0 
        HID Device Descriptor:
          bLength                 9
          bDescriptorType        33
          bcdHID               1.10
          bCountryCode           33 US
          bNumDescriptors         1
          bDescriptorType        34 Report
          wDescriptorLength     102
         Report Descriptors: 
           ** UNAVAILABLE **
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x82  EP 2 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0008  1x 8 bytes
        bInterval              10
Device Status:     0x0000
  (Bus Powered)

Bus 005 Device 004: ID 0a81:0101 Chesen Electronics Corp. Keyboard
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               1.10
  bDeviceClass            0 (Defined at Interface level)
  bDeviceSubClass         0 
  bDeviceProtocol         0 
  bMaxPacketSize0         8
  idVendor           0x0a81 Chesen Electronics Corp.
  idProduct          0x0101 Keyboard
  bcdDevice            1.10
  iManufacturer           1 CHESEN
  iProduct                2 USB Keyboard
  iSerial                 0 
  bNumConfigurations      1
  Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength           59
    bNumInterfaces          2
    bConfigurationValue     1
    iConfiguration          0 
    bmAttributes         0xa0
      (Bus Powered)
      Remote Wakeup
    MaxPower              100mA
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       0
      bNumEndpoints           1
      bInterfaceClass         3 Human Interface Devices
      bInterfaceSubClass      1 Boot Interface Subclass
      bInterfaceProtocol      1 Keyboard
      iInterface              0 
        HID Device Descriptor:
          bLength                 9
          bDescriptorType        33
          bcdHID               1.10
          bCountryCode           33 US
          bNumDescriptors         1
          bDescriptorType        34 Report
          wDescriptorLength      65
         Report Descriptors: 
           ** UNAVAILABLE **
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x81  EP 1 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0008  1x 8 bytes
        bInterval              10
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        1
      bAlternateSetting       0
      bNumEndpoints           1
      bInterfaceClass         3 Human Interface Devices
      bInterfaceSubClass      0 No Subclass
      bInterfaceProtocol      0 None
      iInterface              0 
        HID Device Descriptor:
          bLength                 9
          bDescriptorType        33
          bcdHID               1.10
          bCountryCode           33 US
          bNumDescriptors         1
          bDescriptorType        34 Report
          wDescriptorLength     102
         Report Descriptors: 
           ** UNAVAILABLE **
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x82  EP 2 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0008  1x 8 bytes
        bInterval              10
Device Status:     0x0000
  (Bus Powered)

Bus 005 Device 003: ID 058f:9254 Alcor Micro Corp. Hub
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               1.10
  bDeviceClass            9 Hub
  bDeviceSubClass         0 Unused
  bDeviceProtocol         0 Full speed hub
  bMaxPacketSize0         8
  idVendor           0x058f Alcor Micro Corp.
  idProduct          0x9254 Hub
  bcdDevice            3.12
  iManufacturer           1 ALCOR
  iProduct                2 Generic USB Hub
  iSerial                 0 
  bNumConfigurations      1
  Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength           25
    bNumInterfaces          1
    bConfigurationValue     1
    iConfiguration          0 
    bmAttributes         0xe0
      Self Powered
      Remote Wakeup
    MaxPower              100mA
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       0
      bNumEndpoints           1
      bInterfaceClass         9 Hub
      bInterfaceSubClass      0 Unused
      bInterfaceProtocol      0 Full speed hub
      iInterface              0 
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x81  EP 1 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0001  1x 1 bytes
        bInterval             255
Hub Descriptor:
  bLength               9
  bDescriptorType      41
  nNbrPorts             4
  wHubCharacteristic 0x0009
    Per-port power switching
    Per-port overcurrent protection
  bPwrOn2PwrGood       22 * 2 milli seconds
  bHubContrCurrent    100 milli Ampere
  DeviceRemovable    0x00
  PortPwrCtrlMask    0xff
 Hub Port Status:
   Port 1: 0000.0303 lowspeed power enable connect
   Port 2: 0000.0303 lowspeed power enable connect
   Port 3: 0000.0303 lowspeed power enable connect
   Port 4: 0000.0303 lowspeed power enable connect
Device Status:     0x0001
  Self Powered

Bus 005 Device 002: ID 058f:9254 Alcor Micro Corp. Hub
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               1.10
  bDeviceClass            9 Hub
  bDeviceSubClass         0 Unused
  bDeviceProtocol         0 Full speed hub
  bMaxPacketSize0         8
  idVendor           0x058f Alcor Micro Corp.
  idProduct          0x9254 Hub
  bcdDevice            3.12
  iManufacturer           1 ALCOR
  iProduct                2 Generic USB Hub
  iSerial                 0 
  bNumConfigurations      1
  Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength           25
    bNumInterfaces          1
    bConfigurationValue     1
    iConfiguration          0 
    bmAttributes         0xe0
      Self Powered
      Remote Wakeup
    MaxPower              100mA
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       0
      bNumEndpoints           1
      bInterfaceClass         9 Hub
      bInterfaceSubClass      0 Unused
      bInterfaceProtocol      0 Full speed hub
      iInterface              0 
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x81  EP 1 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0001  1x 1 bytes
        bInterval             255
Hub Descriptor:
  bLength               9
  bDescriptorType      41
  nNbrPorts             4
  wHubCharacteristic 0x0009
    Per-port power switching
    Per-port overcurrent protection
  bPwrOn2PwrGood       22 * 2 milli seconds
  bHubContrCurrent    100 milli Ampere
  DeviceRemovable    0x00
  PortPwrCtrlMask    0xff
 Hub Port Status:
   Port 1: 0000.0100 power
   Port 2: 0000.0100 power
   Port 3: 0000.0100 power
   Port 4: 0000.0103 power enable connect
Device Status:     0x0001
  Self Powered

Bus 005 Device 001: ID 0000:0000  
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               1.10
  bDeviceClass            9 Hub
  bDeviceSubClass         0 Unused
  bDeviceProtocol         0 Full speed hub
  bMaxPacketSize0        64
  idVendor           0x0000 
  idProduct          0x0000 
  bcdDevice            2.06
  iManufacturer           3 Linux 2.6.22-1-mepis-smp uhci_hcd
  iProduct                2 UHCI Host Controller
  iSerial                 1 0000:00:1d.3
  bNumConfigurations      1
  Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength           25
    bNumInterfaces          1
    bConfigurationValue     1
    iConfiguration          0 
    bmAttributes         0xe0
      Self Powered
      Remote Wakeup
    MaxPower                0mA
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       0
      bNumEndpoints           1
      bInterfaceClass         9 Hub
      bInterfaceSubClass      0 Unused
      bInterfaceProtocol      0 Full speed hub
      iInterface              0 
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x81  EP 1 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0002  1x 2 bytes
        bInterval             255
Hub Descriptor:
  bLength               9
  bDescriptorType      41
  nNbrPorts             2
  wHubCharacteristic 0x000a
    No power switching (usb 1.0)
    Per-port overcurrent protection
  bPwrOn2PwrGood        1 * 2 milli seconds
  bHubContrCurrent      0 milli Ampere
  DeviceRemovable    0x00
  PortPwrCtrlMask    0xff
 Hub Port Status:
   Port 1: 0000.0100 power
   Port 2: 0000.0103 power enable connect
Device Status:     0x0003
  Self Powered
  Remote Wakeup Enabled

Bus 004 Device 001: ID 0000:0000  
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               1.10
  bDeviceClass            9 Hub
  bDeviceSubClass         0 Unused
  bDeviceProtocol         0 Full speed hub
  bMaxPacketSize0        64
  idVendor           0x0000 
  idProduct          0x0000 
  bcdDevice            2.06
  iManufacturer           3 Linux 2.6.22-1-mepis-smp uhci_hcd
  iProduct                2 UHCI Host Controller
  iSerial                 1 0000:00:1d.2
  bNumConfigurations      1
  Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength           25
    bNumInterfaces          1
    bConfigurationValue     1
    iConfiguration          0 
    bmAttributes         0xe0
      Self Powered
      Remote Wakeup
    MaxPower                0mA
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       0
      bNumEndpoints           1
      bInterfaceClass         9 Hub
      bInterfaceSubClass      0 Unused
      bInterfaceProtocol      0 Full speed hub
      iInterface              0 
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x81  EP 1 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0002  1x 2 bytes
        bInterval             255
Hub Descriptor:
  bLength               9
  bDescriptorType      41
  nNbrPorts             2
  wHubCharacteristic 0x000a
    No power switching (usb 1.0)
    Per-port overcurrent protection
  bPwrOn2PwrGood        1 * 2 milli seconds
  bHubContrCurrent      0 milli Ampere
  DeviceRemovable    0x00
  PortPwrCtrlMask    0xff
 Hub Port Status:
   Port 1: 0000.0100 power
   Port 2: 0000.0100 power
Device Status:     0x0003
  Self Powered
  Remote Wakeup Enabled

Bus 002 Device 001: ID 0000:0000  
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               1.10
  bDeviceClass            9 Hub
  bDeviceSubClass         0 Unused
  bDeviceProtocol         0 Full speed hub
  bMaxPacketSize0        64
  idVendor           0x0000 
  idProduct          0x0000 
  bcdDevice            2.06
  iManufacturer           3 Linux 2.6.22-1-mepis-smp uhci_hcd
  iProduct                2 UHCI Host Controller
  iSerial                 1 0000:00:1d.0
  bNumConfigurations      1
  Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength           25
    bNumInterfaces          1
    bConfigurationValue     1
    iConfiguration          0 
    bmAttributes         0xe0
      Self Powered
      Remote Wakeup
    MaxPower                0mA
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       0
      bNumEndpoints           1
      bInterfaceClass         9 Hub
      bInterfaceSubClass      0 Unused
      bInterfaceProtocol      0 Full speed hub
      iInterface              0 
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x81  EP 1 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0002  1x 2 bytes
        bInterval             255
Hub Descriptor:
  bLength               9
  bDescriptorType      41
  nNbrPorts             2
  wHubCharacteristic 0x000a
    No power switching (usb 1.0)
    Per-port overcurrent protection
  bPwrOn2PwrGood        1 * 2 milli seconds
  bHubContrCurrent      0 milli Ampere
  DeviceRemovable    0x00
  PortPwrCtrlMask    0xff
 Hub Port Status:
   Port 1: 0000.0100 power
   Port 2: 0000.0100 power
Device Status:     0x0003
  Self Powered
  Remote Wakeup Enabled

Bus 001 Device 001: ID 0000:0000  
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               2.00
  bDeviceClass            9 Hub
  bDeviceSubClass         0 Unused
  bDeviceProtocol         1 Single TT
  bMaxPacketSize0        64
  idVendor           0x0000 
  idProduct          0x0000 
  bcdDevice            2.06
  iManufacturer           3 Linux 2.6.22-1-mepis-smp ehci_hcd
  iProduct                2 EHCI Host Controller
  iSerial                 1 0000:00:1d.7
  bNumConfigurations      1
  Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength           25
    bNumInterfaces          1
    bConfigurationValue     1
    iConfiguration          0 
    bmAttributes         0xe0
      Self Powered
      Remote Wakeup
    MaxPower                0mA
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       0
      bNumEndpoints           1
      bInterfaceClass         9 Hub
      bInterfaceSubClass      0 Unused
      bInterfaceProtocol      0 Full speed hub
      iInterface              0 
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x81  EP 1 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0004  1x 4 bytes
        bInterval              12
Hub Descriptor:
  bLength              11
  bDescriptorType      41
  nNbrPorts             8
  wHubCharacteristic 0x000a
    No power switching (usb 1.0)
    Per-port overcurrent protection
    TT think time 8 FS bits
  bPwrOn2PwrGood       10 * 2 milli seconds
  bHubContrCurrent      0 milli Ampere
  DeviceRemovable    0x00 0x00
  PortPwrCtrlMask    0xff 0xff
 Hub Port Status:
   Port 1: 0000.0100 power
   Port 2: 0000.0100 power
   Port 3: 0000.0100 power
   Port 4: 0000.0100 power
   Port 5: 0000.0100 power
   Port 6: 0000.0100 power
   Port 7: 0000.0100 power
   Port 8: 0000.0100 power
Device Status:     0x0003
  Self Powered
  Remote Wakeup Enabled

Re: PROBLEM: USB keyboards works only 4 per PC host port

[Alan Stern]

On Tue, 19 Aug 2008, Aivils Stoss wrote:

> No problem is same. Older kernels have another troubles.
> 2.6.22-1-mepis-smp
> Quite stable. Have oops sometime inside evdev. Support up to 16 
> USB keyboards, where 4 hubs are plugged into PC and 4 keyboards on
> each hub. Any hub cascade support only 4 keyboards, where 5th or more
> is registered but don't send input events. Oops inside evdev , when
> USB keyboard unplugged. No slow down even all USB keyboards does
> not work properly. My be this one support more than 16 keyboards, but
> i don't have PC USB ports enough.
> 
> 2.6.24-7
> 4 keyboards per port. If plug in 5th tend to total slow down with this one:
> usb 2-1.1.1: reset low speed USB device using 
> uhci_hcd and address 17
> 5th - means 5th keyboard in USB hub's cascade, which is plugged into
> single PC USB port.
> 
> 2.6.26
> 4 keyboards per port. If plug in 5th tend to total slow down.
> 
> 2.6.27-rc3
> Sorry Randy i cannot repeat Your achievement. This worse of all tested
> kernels. I got working 3 USB keyboards, when i plug in 4th, all keyboards,
> include PS/2 stop working. Kernel does not hung up. I can reach box
> via net. dmesg , /proc/bus/input/devices attached. lsusb hung up.

Have you tried looking in your system log for error messages indicating 
the source of the problem?

uhci_hcd 0000:00:1d.1: bandwidth allocation failed: period 8, phase 4, 826 + 118 us
input: USB HID v1.10 Device [CHESEN USB Keyboard] on usb-0000:00:1d.1-2.2.4
usbcore: registered new interface driver usbhid
usbhid: v2.6:USB HID core driver
uhci_hcd 0000:00:1d.1: bandwidth allocation failed: period 8, phase 4, 826 + 118 us
uhci_hcd 0000:00:1d.1: bandwidth allocation failed: period 8, phase 4, 826 + 118 us
uhci_hcd 0000:00:1d.1: bandwidth allocation failed: period 8, phase 4, 826 + 118 us
uhci_hcd 0000:00:1d.1: bandwidth allocation failed: period 8, phase 4, 826 + 118 us
uhci_hcd 0000:00:1d.1: bandwidth allocation failed: period 8, phase 4, 826 + 118 us
uhci_hcd 0000:00:1d.1: bandwidth allocation failed: period 8, phase 4, 826 + 118 us
uhci_hcd 0000:00:1d.1: bandwidth allocation failed: period 8, phase 4, 826 + 118 us
uhci_hcd 0000:00:1d.1: bandwidth allocation failed: period 8, phase 4, 826 + 118 us

Those messages seem pretty clear.  Each keyboard requires two interrupt 
transfers occupying 118 us of bandwidth apiece.  That's 236 us per 
keyboard.

Since there is only 900 us total available for interrupt transfers in
any frame, and since uhci-hcd isn't smart enough to allocate different
interrupt endpoints to different frames, you run out of bandwidth after
four keyboards.

Now if you plugged some of these keyboards into different UHCI 
controllers on the computer, then the problem wouldn't arise.  Each of 
your four UHCI controllers has two ports.  So without using any hubs at 
all, you can plug 8 keyboards into the computer and they will all work.

If you use some extra hubs as well then you can plug four keyboards 
into each controller, allowing you to use 16 keyboards total.

Alan Stern

Re: PROBLEM: USB keyboards works only 4 per PC host port

[Randy Dunlap]

On Tue, 19 Aug 2008 15:27:06 +0530 Aivils Stoss wrote:

> On Monday 18 August 2008 8:44:32 pm Randy Dunlap wrote:
> > On Mon, 18 Aug 2008 16:42:49 +0530 Aivils Stoss wrote:
> > > On Friday 15 August 2008 7:19:48 am Randy Dunlap wrote:
> > > > On Sun, 10 Aug 2008 04:08:37 +0100 Aivils Stoss wrote:
> > > > > On Saturday 09 August 2008 11:42:26 am Samuel Thibault wrote:
> > > > > > Aivils Stoss, le Fri 08 Aug 2008 07:02:24 +0100, a écrit :
> > > > > > > I suppose this is Linux kernel bug because i test keyboards under
> > > > > > > Windows, which support any schema of cascading of usb hubs.
> > > > > >
> > > > > > On the very same machine and hubs?
> > > > >
> > > > > Yes, on same machine. Under Windows i don't have evdev interface,
> > > > > checked only how keypress go to console.
> > > > > Of course to repeat a try You must have at least 5 keyboards and
> > > > > 1 7-port or 2 4-port hubs and kernel 2.6.22 and above. I allways
> > > > > got result - 5th, 6th, 7th keyboard does not send events to console
> > > > > or evdev.
> > > >
> > > > [adding linux-usb mailing list]
> > > >
> > > > Hi,
> > > >
> > > > I finally got 5 USB keyboards together along with 2 hubs.
> > > > I daisy-chained the hubs and connected 1 keyboard to the hub that is
> > > > on the notebook computer USB port, then I connected 4 keyboards to the
> > > > second hub.  They all worked for me, meaning that I can type on all of
> > > > them and have their characters show up on my console.
> > > >
> > > > I'm testing with 2.6.7-rc2.
> > > > 'usbtree' output of the USB subsystem is attached.
> > >
> > > Yeah! 2.6.7 is a bit obsolete. At my end 2.6.15 support more than 4
> > > keyboards per PC port , but mess up input when is plugged more than
> > > 9 keyboards. 10th is capable to send keypress events, but last pressed
> > > key will be repeated until ctrl-c . 10th keyboard disturb an auto repeat
> > > of all keyboards.
> >
> > Sorry, my keyboard made a typo.  I'm testing with 2.6.27-rc2.
> >
> > So the problem is now different from your original report, right?
> 
> No problem is same. Older kernels have another troubles.
> 2.6.22-1-mepis-smp
> Quite stable. Have oops sometime inside evdev. Support up to 16 
> USB keyboards, where 4 hubs are plugged into PC and 4 keyboards on
> each hub. Any hub cascade support only 4 keyboards, where 5th or more
> is registered but don't send input events. Oops inside evdev , when
> USB keyboard unplugged. No slow down even all USB keyboards does
> not work properly. My be this one support more than 16 keyboards, but
> i don't have PC USB ports enough.

Has the evdev oops been reported and/or fixed?
I think that we would prefer to fix that soonish.


> 2.6.24-7
> 4 keyboards per port. If plug in 5th tend to total slow down with this one:
> usb 2-1.1.1: reset low speed USB device using 
> uhci_hcd and address 17
> 5th - means 5th keyboard in USB hub's cascade, which is plugged into
> single PC USB port.
> 
> 2.6.26
> 4 keyboards per port. If plug in 5th tend to total slow down.
> 
> 2.6.27-rc3
> Sorry Randy i cannot repeat Your achievement. This worse of all tested
> kernels. I got working 3 USB keyboards, when i plug in 4th, all keyboards,
> include PS/2 stop working. Kernel does not hung up. I can reach box
> via net. dmesg , /proc/bus/input/devices attached. lsusb hung up.

Please try to include full dmesg (kernel boot log) in the future.
This was was truncated at the front (early messages).

> Please notify me , if i should use 2.6.27-rc2 !

It doesn't seem preferable for you yet.

Looks like it could be a problem just to put N low-speed devices on one root hub/port:

uhci_hcd 0000:00:1d.1: bandwidth allocation failed: period 8, phase 4, 826 + 118 us
uhci_hcd 0000:00:1d.1: bandwidth allocation failed: period 8, phase 4, 826 + 118 us
uhci_hcd 0000:00:1d.1: bandwidth allocation failed: period 8, phase 4, 826 + 118 us
etc etc.

Alan (Stern), could you look at this one, please?


> Aivils
> 
> >
> >
> > What speed is the host port that the keyboards are connected to?
> > Could it be a USB bus bandwidth limitation?  (not that any code
> > checks for that)
> >
> > I barely found 5 USB keyboards, so I surely can't test 10 or more.  ;)
> > I suppose that it will take some USB debug messages to attempt to see
> > what is going on...


---
~Randy
Linux Plumbers Conference, 17-19 September 2008, Portland, Oregon USA
http://linuxplumbersconf.org/

Re: PROBLEM: USB keyboards works only 4 per PC host port

[Jiri Kosina]

On Tue, 19 Aug 2008, Randy Dunlap wrote:

> > 2.6.22-1-mepis-smp
> > Quite stable. Have oops sometime inside evdev. Support up to 16 
> > USB keyboards, where 4 hubs are plugged into PC and 4 keyboards on
> > each hub. Any hub cascade support only 4 keyboards, where 5th or more
> > is registered but don't send input events. Oops inside evdev , when
> > USB keyboard unplugged. No slow down even all USB keyboards does
> > not work properly. My be this one support more than 16 keyboards, but
> > i don't have PC USB ports enough.
> Has the evdev oops been reported and/or fixed? I think that we would 
> prefer to fix that soonish.

We haven't seen the respective oops yet, or have I missed it?

I'd bet it is fixed in newer kernels by patches that introduce proper 
locking into evdev code.

-- 
Jiri Kosina
SUSE Labs

Re: PROBLEM: USB keyboards works only 4 per PC host port

[Dmitry Torokhov]

On Tue, Aug 19, 2008 at 05:23:07PM +0200, Jiri Kosina wrote:
> On Tue, 19 Aug 2008, Randy Dunlap wrote:
> 
> > > 2.6.22-1-mepis-smp
> > > Quite stable. Have oops sometime inside evdev. Support up to 16 
> > > USB keyboards, where 4 hubs are plugged into PC and 4 keyboards on
> > > each hub. Any hub cascade support only 4 keyboards, where 5th or more
> > > is registered but don't send input events. Oops inside evdev , when
> > > USB keyboard unplugged. No slow down even all USB keyboards does
> > > not work properly. My be this one support more than 16 keyboards, but
> > > i don't have PC USB ports enough.
> > Has the evdev oops been reported and/or fixed? I think that we would 
> > prefer to fix that soonish.
> 
> We haven't seen the respective oops yet, or have I missed it?
> 
> I'd bet it is fixed in newer kernels by patches that introduce proper 
> locking into evdev code.
> 

If evdev (or any other part of the input sybsystem) still oopses in
2.6.26 and 2.6.27 I would like to see that oops very much.

-- 
Dmitry

Re: PROBLEM: USB keyboards works only 4 per PC host port

[Aivils Stoss]

On Tuesday 19 August 2008 8:53:07 pm Jiri Kosina wrote:
> On Tue, 19 Aug 2008, Randy Dunlap wrote:
> > > 2.6.22-1-mepis-smp
> > > Quite stable. Have oops sometime inside evdev. Support up to 16
> > > USB keyboards, where 4 hubs are plugged into PC and 4 keyboards on
> > > each hub. Any hub cascade support only 4 keyboards, where 5th or more
> > > is registered but don't send input events. Oops inside evdev , when
> > > USB keyboard unplugged. No slow down even all USB keyboards does
> > > not work properly. My be this one support more than 16 keyboards, but
> > > i don't have PC USB ports enough.
> >
> > Has the evdev oops been reported and/or fixed? I think that we would
> > prefer to fix that soonish.
>
> We haven't seen the respective oops yet, or have I missed it?
>
> I'd bet it is fixed in newer kernels by patches that introduce proper
> locking into evdev code.

I don't know exists this one in the 2.6.26 and above :o(

Aivils Stoss

# cat /proc/version
Linux version 2.6.22-1-mepis-smp (root@mepis-pro) (gcc version 4.1.2 20061115 
(prerelease) (Debian 4.1.1-21)) #1 SMP PREEMPT Sun Dec 2 19:15:40 EST 2007

# dmesg
input: CHESEN USB Keyboard as /class/input/input41
input: USB HID v1.10 Device [CHESEN USB Keyboard] on usb-0000:00:1d.3-2.4.4
hub 5-0:1.0: port 2 disabled by hub (EMI?), re-enabling...
usb 5-2: USB disconnect, address 8
usb 5-2.1: USB disconnect, address 14
usb 5-2.1.2: USB disconnect, address 23
BUG: unable to handle kernel paging request at virtual address 00100100
 printing eip:
f8832664
*pde = 00000000
Oops: 0000 [#1]
PREEMPT SMP
Modules linked in: i915 drm evdev binfmt_misc cpufreq_ondemand 
cpufreq_userspace cpufreq_powersave acpi_cpufreq speedstep_lib freq_table 
rfcomm hidp l2cap bluetooth ppdev lp thermal fan button processor ac battery 
ipv6 snd_emu10k1_synth snd_emux_synth snd_seq_virmidi snd_seq_midi_emul 
snd_emu10k1 snd_util_mem snd_hwdep piix ide_core fuse ndiswrapper dm_crypt 
dm_snapshot dm_mirror dm_mod usbhid hid sworks_agp amd_k7_agp ali_agp sis_agp 
ati_agp nvidia_agp via_agp wlan_scan_sta ath_rate_sample snd_emu10k1x 
snd_seq_dummy snd_seq_oss snd_seq_midi snd_seq_midi_event snd_seq snd_rawmidi 
snd_seq_device snd_ac97_codec snd_pcm_oss snd_mixer_oss snd_pcm snd_timer snd 
soundcore intel_agp agpgart ac97_bus i2c_i801 i2c_core snd_page_alloc 
parport_pc parport floppy ath_pci wlan ath_hal(P) serio_raw psmouse uhci_hcd 
atl2 pcspkr
CPU:    0
EIP:    0060:[<f8832664>]    Tainted: P       VLI
EFLAGS: 00010206   (2.6.22-1-mepis-smp #1)
EIP is at evdev_disconnect+0x73/0xb1 [evdev]
eax: 00000000   ebx: 000ffcf0   ecx: f73d5540   edx: 01329000
esi: f6c31340   edi: cf00c000   ebp: d2a56800   esp: c1a59e48
ds: 007b   es: 007b   fs: 00d8  gs: 0000  ss: 0068
Process khubd (pid: 168, ti=c1a58000 task=c1aaf030 task.ti=c1a58000)
Stack: c368c800 c368c800 c368cecc c0321be7 00000000 c048f02c c18de420 d2a56800
       f6f98ba0 cf00cc58 f8a51354 caf8501c caf85000 cf00c000 f8a4129d d2a56800
       d2a56818 f8a45dc0 e4ef2800 c030715f 00000000 d2a56818 f8a45df4 00000000
Call Trace:
 [<c0321be7>] input_unregister_device+0x67/0xfc
 [<f8a51354>] hidinput_disconnect+0x2e/0x47 [hid]
 [<f8a4129d>] hid_disconnect+0x70/0xc1 [usbhid]
 [<c030715f>] usb_unbind_interface+0x44/0x85
 [<c02b16a4>] __device_release_driver+0x71/0x8e
 [<c02b1a2c>] device_release_driver+0x1e/0x34
 [<c02b108e>] bus_remove_device+0x5e/0x6c
 [<c02afb7d>] device_del+0x1a4/0x218
 [<c0304c75>] usb_disable_device+0x5c/0xbb
 [<c0301773>] usb_disconnect+0x83/0x11b
 [<c0301761>] usb_disconnect+0x71/0x11b
 [<c0301761>] usb_disconnect+0x71/0x11b
 [<c0301e5e>] hub_thread+0x365/0xa67
 [<c0392677>] __sched_text_start+0x6f7/0x793
 [<c0133e60>] autoremove_wake_function+0x0/0x35
 [<c0301af9>] hub_thread+0x0/0xa67
 [<c0133d93>] kthread+0x38/0x5d
 [<c0133d5b>] kthread+0x0/0x5d
 [<c01049d7>] kernel_thread_helper+0x7/0x10
 =======================
Code: e8 07 e4 ae c7 8b 5e 54 eb 1b 8d 83 08 04 00 00 b9 06 00 02 00 ba 1d 00 
00 00 e8 40 11 94 c7 8b 9b 10 04 00 00 81 eb 10 04 00 00 <8b> 83 10 04 00 00 
0f 18 00 90 8d 93 10 04 00 00 8d 46 54 39 c2
EIP: [<f8832664>] evdev_disconnect+0x73/0xb1 [evdev] SS:ESP 0068:c1a59e48
hid-debug: input LED.CapsLock = 1
/home/aivils/works/kernel/hid/usbhid/hid-core.c: usb_submit_urb(ctrl) failed
hid-debug: input LED.CapsLock = 1
/home/aivils/works/kernel/hid/usbhid/hid-core.c: usb_submit_urb(ctrl) failed
hid-debug: input LED.CapsLock = 1
/home/aivils/works/kernel/hid/usbhid/hid-core.c: usb_submit_urb(ctrl) failed
hid-debug: input LED.CapsLock = 1
/home/aivils/works/kernel/hid/usbhid/hid-core.c: usb_submit_urb(ctrl) failed
hid-debug: input LED.CapsLock = 1
/home/aivils/works/kernel/hid/usbhid/hid-core.c: usb_submit_urb(ctrl) failed
hid-debug: input LED.CapsLock = 0
/home/aivils/works/kernel/hid/usbhid/hid-core.c: usb_submit_urb(ctrl) failed
hid-debug: input LED.CapsLock = 0
/home/aivils/works/kernel/hid/usbhid/hid-core.c: usb_submit_urb(ctrl) failed
hid-debug: input LED.CapsLock = 0
/home/aivils/works/kernel/hid/usbhid/hid-core.c: usb_submit_urb(ctrl) failed
hid-debug: input LED.CapsLock = 0
/home/aivils/works/kernel/hid/usbhid/hid-core.c: usb_submit_urb(ctrl) failed
hid-debug: input LED.CapsLock = 0
/home/aivils/works/kernel/hid/usbhid/hid-core.c: usb_submit_urb(ctrl) failed


# cat /proc/modules
i915 21120 2 - Live 0xf8d13000
drm 67092 3 i915, Live 0xf8d21000
evdev 7936 5 - Live 0xf8832000
binfmt_misc 9224 1 - Live 0xf8cc5000
cpufreq_ondemand 7436 2 - Live 0xf8cb0000
cpufreq_userspace 4256 0 - Live 0xf8cb3000
cpufreq_powersave 2560 0 - Live 0xf8c10000
acpi_cpufreq 7624 0 - Live 0xf8c92000
speedstep_lib 4740 0 - Live 0xf8cad000
freq_table 4512 2 cpufreq_ondemand,acpi_cpufreq, Live 0xf8c95000
rfcomm 31256 0 - Live 0xf8cb8000
hidp 15232 2 - Live 0xf8c86000
l2cap 19712 10 rfcomm,hidp, Live 0xf8c9a000
bluetooth 42724 5 rfcomm,hidp,l2cap, Live 0xf8ca1000
ppdev 7684 0 - Live 0xf8c8f000
lp 9476 0 - Live 0xf8c8b000
thermal 11784 0 - Live 0xf8c1a000
fan 4612 0 - Live 0xf8c21000
button 7056 0 - Live 0xf8c1e000
processor 25928 2 acpi_cpufreq,thermal, Live 0xf8c12000
ac 4740 0 - Live 0xf8bfc000
battery 9220 0 - Live 0xf8bf8000
ipv6 217380 12 - Live 0xf8cc9000
snd_emu10k1_synth 6784 0 - Live 0xf8bf5000
snd_emux_synth 29568 1 snd_emu10k1_synth, Live 0xf8bff000
snd_seq_virmidi 6144 1 snd_emux_synth, Live 0xf8bf2000
snd_seq_midi_emul 6016 1 snd_emux_synth, Live 0xf8a7d000
snd_emu10k1 119232 1 snd_emu10k1_synth, Live 0xf8c67000
snd_util_mem 4352 2 snd_emux_synth,snd_emu10k1, Live 0xf8a7a000
snd_hwdep 7556 2 snd_emux_synth,snd_emu10k1, Live 0xf8a77000
piix 8708 0 [permanent], Live 0xf8a66000
ide_core 100036 1 piix, Live 0xf8c4d000
fuse 36756 1 - Live 0xf89f6000
ndiswrapper 162396 0 - Live 0xf8c24000
dm_crypt 11272 0 - Live 0xf884f000
dm_snapshot 14888 0 - Live 0xf8a5c000
dm_mirror 18304 0 - Live 0xf8a48000
dm_mod 43840 3 dm_crypt,dm_snapshot,dm_mirror, Live 0xf8a6b000
usbhid 22240 0 - Live 0xf8a41000
hid 41344 2 hidp,usbhid, Live 0xf8a50000
sworks_agp 8096 0 - Live 0xf89f3000
amd_k7_agp 7436 0 - Live 0xf89f0000
ali_agp 6144 0 - Live 0xf89d3000
sis_agp 7556 0 - Live 0xf89d0000
ati_agp 7564 0 - Live 0xf89cd000
nvidia_agp 7068 0 - Live 0xf89ca000
via_agp 8960 0 - Live 0xf882e000
wlan_scan_sta 11776 1 - Live 0xf89c6000
ath_rate_sample 11776 1 - Live 0xf8959000
snd_emu10k1x 15268 0 - Live 0xf8991000
snd_seq_dummy 3844 0 - Live 0xf8960000
snd_seq_oss 28800 0 - Live 0xf8996000
snd_seq_midi 6944 0 - Live 0xf897c000
snd_seq_midi_event 6656 3 snd_seq_virmidi,snd_seq_oss,snd_seq_midi, Live 
0xf895d000
snd_seq 42576 9 
snd_emux_synth,snd_seq_virmidi,snd_seq_midi_emul,snd_seq_dummy,snd_seq_oss,snd_seq_midi,snd_seq_midi_event, 
Live 0xf89ba000
snd_rawmidi 18208 4 snd_seq_virmidi,snd_emu10k1,snd_emu10k1x,snd_seq_midi, 
Live 0xf8856000
snd_seq_device 7308 8 
snd_emu10k1_synth,snd_emux_synth,snd_emu10k1,snd_seq_dummy,snd_seq_oss,snd_seq_midi,snd_seq,snd_rawmidi, 
Live 0xf88f1000
snd_ac97_codec 90788 2 snd_emu10k1,snd_emu10k1x, Live 0xf89d8000
snd_pcm_oss 34976 0 - Live 0xf89b0000
snd_mixer_oss 14592 1 snd_pcm_oss, Live 0xf8977000
snd_pcm 62084 4 snd_emu10k1,snd_emu10k1x,snd_ac97_codec,snd_pcm_oss, Live 
0xf899f000
snd_timer 17668 3 snd_emu10k1,snd_seq,snd_pcm, Live 0xf8971000
snd 41316 15 
snd_emux_synth,snd_seq_virmidi,snd_emu10k1,snd_hwdep,snd_emu10k1x,snd_seq_dummy,snd_seq_oss,snd_seq,snd_rawmidi,snd_seq_device,snd_ac97_codec,snd_pcm_oss,snd_mixer_oss,snd_pcm,snd_timer, 
Live 0xf897f000
soundcore 6880 1 snd, Live 0xf887d000
intel_agp 21012 1 - Live 0xf896a000
agpgart 25804 10 
drm,sworks_agp,amd_k7_agp,ali_agp,sis_agp,ati_agp,nvidia_agp,via_agp,intel_agp, 
Live 0xf8962000
ac97_bus 3072 1 snd_ac97_codec, Live 0xf8866000
i2c_i801 8208 0 - Live 0xf8860000
i2c_core 19456 1 i2c_i801, Live 0xf8877000
snd_page_alloc 8328 3 snd_emu10k1,snd_emu10k1x,snd_pcm, Live 0xf885c000
parport_pc 30116 1 - Live 0xf8950000
parport 29512 3 ppdev,lp,parport_pc, Live 0xf88d6000
floppy 50052 0 - Live 0xf8869000
ath_pci 81440 0 - Live 0xf88c1000
wlan 170180 4 wlan_scan_sta,ath_rate_sample,ath_pci, Live 0xf8925000
ath_hal 190544 3 ath_rate_sample,ath_pci, Live 0xf88f5000 (P)
serio_raw 6020 0 - Live 0xf8853000
psmouse 34320 0 - Live 0xf8837000
uhci_hcd 20364 0 - Live 0xf8849000
atl2 24216 0 - Live 0xf8842000
pcspkr 3456 0 - Live 0xf8835000


# objdump -D evdev.ko

evdev.ko:     file format elf32-i386

Disassembly of section .text:

00000000 <evdev_poll>:
   0:	57                   	push   %edi
   1:	56                   	push   %esi
   2:	53                   	push   %ebx
   3:	89 d3                	mov    %edx,%ebx
   5:	8b b0 80 00 00 00    	mov    0x80(%eax),%esi
   b:	85 db                	test   %ebx,%ebx
   d:	8b be 0c 04 00 00    	mov    0x40c(%esi),%edi
  13:	8d 57 40             	lea    0x40(%edi),%edx
  16:	74 08                	je     20 <evdev_poll+0x20>
  18:	85 d2                	test   %edx,%edx
  1a:	74 04                	je     20 <evdev_poll+0x20>
  1c:	89 d9                	mov    %ebx,%ecx
  1e:	ff 13                	call   *(%ebx)
  20:	8b 96 00 04 00 00    	mov    0x400(%esi),%edx
  26:	31 c0                	xor    %eax,%eax
  28:	3b 96 04 04 00 00    	cmp    0x404(%esi),%edx
  2e:	ba 41 00 00 00       	mov    $0x41,%edx
  33:	5b                   	pop    %ebx
  34:	0f 45 c2             	cmovne %edx,%eax
  37:	83 3f 01             	cmpl   $0x1,(%edi)
  3a:	5e                   	pop    %esi
  3b:	19 d2                	sbb    %edx,%edx
  3d:	5f                   	pop    %edi
  3e:	83 e2 18             	and    $0x18,%edx
  41:	09 d0                	or     %edx,%eax
  43:	c3                   	ret    

00000044 <evdev_fasync>:
  44:	53                   	push   %ebx
  45:	83 ec 04             	sub    $0x4,%esp
  48:	8b 9a 80 00 00 00    	mov    0x80(%edx),%ebx
  4e:	81 c3 08 04 00 00    	add    $0x408,%ebx
  54:	89 1c 24             	mov    %ebx,(%esp)
  57:	e8 fc ff ff ff       	call   58 <evdev_fasync+0x14>
  5c:	89 c2                	mov    %eax,%edx
  5e:	31 c0                	xor    %eax,%eax
  60:	85 d2                	test   %edx,%edx
  62:	0f 4e c2             	cmovle %edx,%eax
  65:	5a                   	pop    %edx
  66:	5b                   	pop    %ebx
  67:	c3                   	ret    

00000068 <evdev_free>:
  68:	8b 50 08             	mov    0x8(%eax),%edx
  6b:	c7 04 95 00 00 00 00 	movl   $0x0,0x0(,%edx,4)
  72:	00 00 00 00 
  76:	e9 fc ff ff ff       	jmp    77 <evdev_free+0xf>

0000007b <evdev_flush>:
  7b:	89 c2                	mov    %eax,%edx
  7d:	8b 80 80 00 00 00    	mov    0x80(%eax),%eax
  83:	8b 80 0c 04 00 00    	mov    0x40c(%eax),%eax
  89:	83 38 00             	cmpl   $0x0,(%eax)
  8c:	74 08                	je     96 <evdev_flush+0x1b>
  8e:	83 c0 1c             	add    $0x1c,%eax
  91:	e9 fc ff ff ff       	jmp    92 <evdev_flush+0x17>
  96:	b8 ed ff ff ff       	mov    $0xffffffed,%eax
  9b:	c3                   	ret    

0000009c <str_to_user>:
  9c:	57                   	push   %edi
  9d:	85 c0                	test   %eax,%eax
  9f:	56                   	push   %esi
  a0:	bf fe ff ff ff       	mov    $0xfffffffe,%edi
  a5:	53                   	push   %ebx
  a6:	89 ce                	mov    %ecx,%esi
  a8:	89 c3                	mov    %eax,%ebx
  aa:	74 29                	je     d5 <str_to_user+0x39>
  ac:	31 c0                	xor    %eax,%eax
  ae:	83 c9 ff             	or     $0xffffffff,%ecx
  b1:	89 df                	mov    %ebx,%edi
  b3:	f2 ae                	repnz scas %es:(%edi),%al
  b5:	f7 d1                	not    %ecx
  b7:	49                   	dec    %ecx
  b8:	8d 79 01             	lea    0x1(%ecx),%edi
  bb:	89 f0                	mov    %esi,%eax
  bd:	39 d7                	cmp    %edx,%edi
  bf:	0f 47 fa             	cmova  %edx,%edi
  c2:	89 da                	mov    %ebx,%edx
  c4:	89 f9                	mov    %edi,%ecx
  c6:	e8 fc ff ff ff       	call   c7 <str_to_user+0x2b>
  cb:	85 c0                	test   %eax,%eax
  cd:	b8 f2 ff ff ff       	mov    $0xfffffff2,%eax
  d2:	0f 45 f8             	cmovne %eax,%edi
  d5:	5b                   	pop    %ebx
  d6:	89 f8                	mov    %edi,%eax
  d8:	5e                   	pop    %esi
  d9:	5f                   	pop    %edi
  da:	c3                   	ret    

000000db <bits_to_user>:
  db:	53                   	push   %ebx
  dc:	c1 ea 05             	shr    $0x5,%edx
  df:	8d 1c 95 04 00 00 00 	lea    0x4(,%edx,4),%ebx
  e6:	89 c2                	mov    %eax,%edx
  e8:	8b 44 24 08          	mov    0x8(%esp),%eax
  ec:	39 cb                	cmp    %ecx,%ebx
  ee:	0f 47 d9             	cmova  %ecx,%ebx
  f1:	89 d9                	mov    %ebx,%ecx
  f3:	e8 fc ff ff ff       	call   f4 <bits_to_user+0x19>
  f8:	85 c0                	test   %eax,%eax
  fa:	b8 f2 ff ff ff       	mov    $0xfffffff2,%eax
  ff:	0f 45 d8             	cmovne %eax,%ebx
 102:	89 d8                	mov    %ebx,%eax
 104:	5b                   	pop    %ebx
 105:	c3                   	ret    

00000106 <evdev_ioctl>:
 106:	55                   	push   %ebp
 107:	57                   	push   %edi
 108:	89 cf                	mov    %ecx,%edi
 10a:	56                   	push   %esi
 10b:	53                   	push   %ebx
 10c:	89 d3                	mov    %edx,%ebx
 10e:	83 ec 54             	sub    $0x54,%esp
 111:	89 44 24 08          	mov    %eax,0x8(%esp)
 115:	8b 80 80 00 00 00    	mov    0x80(%eax),%eax
 11b:	89 44 24 0c          	mov    %eax,0xc(%esp)
 11f:	8b a8 0c 04 00 00    	mov    0x40c(%eax),%ebp
 125:	b8 ed ff ff ff       	mov    $0xffffffed,%eax
 12a:	83 7d 00 00          	cmpl   $0x0,0x0(%ebp)
 12e:	8b 75 28             	mov    0x28(%ebp),%esi
 131:	0f 84 b2 04 00 00    	je     5e9 <evdev_ioctl+0x4e3>
 137:	81 fa 80 45 2c 40    	cmp    $0x402c4580,%edx
 13d:	0f 84 98 01 00 00    	je     2db <evdev_ioctl+0x1d5>
 143:	77 3c                	ja     181 <evdev_ioctl+0x7b>
 145:	81 fa 90 45 04 40    	cmp    $0x40044590,%edx
 14b:	0f 84 08 02 00 00    	je     359 <evdev_ioctl+0x253>
 151:	77 11                	ja     164 <evdev_ioctl+0x5e>
 153:	81 fa 81 45 04 40    	cmp    $0x40044581,%edx
 159:	0f 85 42 02 00 00    	jne    3a1 <evdev_ioctl+0x29b>
 15f:	e9 c0 01 00 00       	jmp    324 <evdev_ioctl+0x21e>
 164:	81 fa 03 45 08 40    	cmp    $0x40084503,%edx
 16a:	0f 84 9d 00 00 00    	je     20d <evdev_ioctl+0x107>
 170:	81 fa 04 45 08 40    	cmp    $0x40084504,%edx
 176:	0f 85 25 02 00 00    	jne    3a1 <evdev_ioctl+0x29b>
 17c:	e9 24 01 00 00       	jmp    2a5 <evdev_ioctl+0x19f>
 181:	81 fa 02 45 08 80    	cmp    $0x80084502,%edx
 187:	74 43                	je     1cc <evdev_ioctl+0xc6>
 189:	77 19                	ja     1a4 <evdev_ioctl+0x9e>
 18b:	81 fa 01 45 04 80    	cmp    $0x80044501,%edx
 191:	74 2a                	je     1bd <evdev_ioctl+0xb7>
 193:	81 fa 84 45 04 80    	cmp    $0x80044584,%edx
 199:	0f 85 02 02 00 00    	jne    3a1 <evdev_ioctl+0x29b>
 19f:	e9 92 01 00 00       	jmp    336 <evdev_ioctl+0x230>
 1a4:	81 fa 03 45 08 80    	cmp    $0x80084503,%edx
 1aa:	74 2d                	je     1d9 <evdev_ioctl+0xd3>
 1ac:	81 fa 04 45 08 80    	cmp    $0x80084504,%edx
 1b2:	0f 85 e9 01 00 00    	jne    3a1 <evdev_ioctl+0x29b>
 1b8:	e9 b4 00 00 00       	jmp    271 <evdev_ioctl+0x16b>
 1bd:	b8 00 00 01 00       	mov    $0x10000,%eax
 1c2:	e8 fc ff ff ff       	call   1c3 <evdev_ioctl+0xbd>
 1c7:	e9 1d 04 00 00       	jmp    5e9 <evdev_ioctl+0x4e3>
 1cc:	8d 56 10             	lea    0x10(%esi),%edx
 1cf:	b9 08 00 00 00       	mov    $0x8,%ecx
 1d4:	e9 7f 03 00 00       	jmp    558 <evdev_ioctl+0x452>
 1d9:	8b 46 18             	mov    0x18(%esi),%eax
 1dc:	a9 00 00 10 00       	test   $0x100000,%eax
 1e1:	0f 84 ef 03 00 00    	je     5d6 <evdev_ioctl+0x4d0>
 1e7:	8b 86 c4 01 00 00    	mov    0x1c4(%esi),%eax
 1ed:	e8 fc ff ff ff       	call   1ee <evdev_ioctl+0xe8>
 1f2:	85 c0                	test   %eax,%eax
 1f4:	0f 85 d5 03 00 00    	jne    5cf <evdev_ioctl+0x4c9>
 1fa:	8b 86 c8 01 00 00    	mov    0x1c8(%esi),%eax
 200:	8d 4f 04             	lea    0x4(%edi),%ecx
 203:	e8 fc ff ff ff       	call   204 <evdev_ioctl+0xfe>
 208:	e9 52 03 00 00       	jmp    55f <evdev_ioctl+0x459>
 20d:	8b 46 18             	mov    0x18(%esi),%eax
 210:	a9 00 00 10 00       	test   $0x100000,%eax
 215:	0f 84 bb 03 00 00    	je     5d6 <evdev_ioctl+0x4d0>
 21b:	89 c8                	mov    %ecx,%eax
 21d:	e8 fc ff ff ff       	call   21e <evdev_ioctl+0x118>
 222:	85 c0                	test   %eax,%eax
 224:	89 d1                	mov    %edx,%ecx
 226:	0f 85 a3 03 00 00    	jne    5cf <evdev_ioctl+0x4c9>
 22c:	8d 47 04             	lea    0x4(%edi),%eax
 22f:	e8 fc ff ff ff       	call   230 <evdev_ioctl+0x12a>
 234:	85 c0                	test   %eax,%eax
 236:	0f 85 93 03 00 00    	jne    5cf <evdev_ioctl+0x4c9>
 23c:	8d 5d 1c             	lea    0x1c(%ebp),%ebx
 23f:	89 d8                	mov    %ebx,%eax
 241:	89 54 24 50          	mov    %edx,0x50(%esp)
 245:	ba 14 00 00 00       	mov    $0x14,%edx
 24a:	89 0c 24             	mov    %ecx,(%esp)
 24d:	31 c9                	xor    %ecx,%ecx
 24f:	e8 fc ff ff ff       	call   250 <evdev_ioctl+0x14a>
 254:	b9 01 00 00 00       	mov    $0x1,%ecx
 259:	ba 14 00 00 00       	mov    $0x14,%edx
 25e:	8b 44 24 50          	mov    0x50(%esp),%eax
 262:	89 04 24             	mov    %eax,(%esp)
 265:	89 d8                	mov    %ebx,%eax
 267:	e8 fc ff ff ff       	call   268 <evdev_ioctl+0x162>
 26c:	e9 0e 01 00 00       	jmp    37f <evdev_ioctl+0x279>
 271:	89 c8                	mov    %ecx,%eax
 273:	e8 fc ff ff ff       	call   274 <evdev_ioctl+0x16e>
 278:	85 c0                	test   %eax,%eax
 27a:	0f 85 4f 03 00 00    	jne    5cf <evdev_ioctl+0x4c9>
 280:	8d 4c 24 50          	lea    0x50(%esp),%ecx
 284:	89 f0                	mov    %esi,%eax
 286:	ff 96 98 00 00 00    	call   *0x98(%esi)
 28c:	85 c0                	test   %eax,%eax
 28e:	0f 85 55 03 00 00    	jne    5e9 <evdev_ioctl+0x4e3>
 294:	8b 44 24 50          	mov    0x50(%esp),%eax
 298:	8d 4f 04             	lea    0x4(%edi),%ecx
 29b:	e8 fc ff ff ff       	call   29c <evdev_ioctl+0x196>
 2a0:	e9 ba 02 00 00       	jmp    55f <evdev_ioctl+0x459>
 2a5:	89 c8                	mov    %ecx,%eax
 2a7:	e8 fc ff ff ff       	call   2a8 <evdev_ioctl+0x1a2>
 2ac:	85 c0                	test   %eax,%eax
 2ae:	89 d3                	mov    %edx,%ebx
 2b0:	0f 85 19 03 00 00    	jne    5cf <evdev_ioctl+0x4c9>
 2b6:	8d 41 04             	lea    0x4(%ecx),%eax
 2b9:	e8 fc ff ff ff       	call   2ba <evdev_ioctl+0x1b4>
 2be:	85 c0                	test   %eax,%eax
 2c0:	0f 85 09 03 00 00    	jne    5cf <evdev_ioctl+0x4c9>
 2c6:	89 d1                	mov    %edx,%ecx
 2c8:	89 f0                	mov    %esi,%eax
 2ca:	89 54 24 50          	mov    %edx,0x50(%esp)
 2ce:	89 da                	mov    %ebx,%edx
 2d0:	ff 96 94 00 00 00    	call   *0x94(%esi)
 2d6:	e9 0e 03 00 00       	jmp    5e9 <evdev_ioctl+0x4e3>
 2db:	8d 5c 24 10          	lea    0x10(%esp),%ebx
 2df:	b9 2c 00 00 00       	mov    $0x2c,%ecx
 2e4:	89 fa                	mov    %edi,%edx
 2e6:	89 d8                	mov    %ebx,%eax
 2e8:	e8 fc ff ff ff       	call   2e9 <evdev_ioctl+0x1e3>
 2ed:	85 c0                	test   %eax,%eax
 2ef:	0f 85 da 02 00 00    	jne    5cf <evdev_ioctl+0x4c9>
 2f5:	8b 4c 24 08          	mov    0x8(%esp),%ecx
 2f9:	89 da                	mov    %ebx,%edx
 2fb:	89 f0                	mov    %esi,%eax
 2fd:	e8 fc ff ff ff       	call   2fe <evdev_ioctl+0x1f8>
 302:	8d 4f 02             	lea    0x2(%edi),%ecx
 305:	66 8b 54 24 12       	mov    0x12(%esp),%dx
 30a:	89 c3                	mov    %eax,%ebx
 30c:	89 d0                	mov    %edx,%eax
 30e:	e8 fc ff ff ff       	call   30f <evdev_ioctl+0x209>
 313:	89 c2                	mov    %eax,%edx
 315:	89 d8                	mov    %ebx,%eax
 317:	85 d2                	test   %edx,%edx
 319:	0f 84 ca 02 00 00    	je     5e9 <evdev_ioctl+0x4e3>
 31f:	e9 ab 02 00 00       	jmp    5cf <evdev_ioctl+0x4c9>
 324:	8b 4c 24 08          	mov    0x8(%esp),%ecx
 328:	89 fa                	mov    %edi,%edx
 32a:	89 f0                	mov    %esi,%eax
 32c:	e8 fc ff ff ff       	call   32d <evdev_ioctl+0x227>
 331:	e9 b3 02 00 00       	jmp    5e9 <evdev_ioctl+0x4e3>
 336:	8b 46 18             	mov    0x18(%esi),%eax
 339:	31 d2                	xor    %edx,%edx
 33b:	a9 00 00 20 00       	test   $0x200000,%eax
 340:	74 09                	je     34b <evdev_ioctl+0x245>
 342:	8b 86 9c 00 00 00    	mov    0x9c(%esi),%eax
 348:	8b 50 40             	mov    0x40(%eax),%edx
 34b:	89 d0                	mov    %edx,%eax
 34d:	89 f9                	mov    %edi,%ecx
 34f:	e8 fc ff ff ff       	call   350 <evdev_ioctl+0x24a>
 354:	e9 06 02 00 00       	jmp    55f <evdev_ioctl+0x459>
 359:	85 c9                	test   %ecx,%ecx
 35b:	8b 45 50             	mov    0x50(%ebp),%eax
 35e:	74 26                	je     386 <evdev_ioctl+0x280>
 360:	85 c0                	test   %eax,%eax
 362:	0f 85 75 02 00 00    	jne    5dd <evdev_ioctl+0x4d7>
 368:	8d 45 1c             	lea    0x1c(%ebp),%eax
 36b:	e8 fc ff ff ff       	call   36c <evdev_ioctl+0x266>
 370:	85 c0                	test   %eax,%eax
 372:	0f 85 65 02 00 00    	jne    5dd <evdev_ioctl+0x4d7>
 378:	8b 44 24 0c          	mov    0xc(%esp),%eax
 37c:	89 45 50             	mov    %eax,0x50(%ebp)
 37f:	31 c0                	xor    %eax,%eax
 381:	e9 63 02 00 00       	jmp    5e9 <evdev_ioctl+0x4e3>
 386:	3b 44 24 0c          	cmp    0xc(%esp),%eax
 38a:	0f 85 54 02 00 00    	jne    5e4 <evdev_ioctl+0x4de>
 390:	8d 45 1c             	lea    0x1c(%ebp),%eax
 393:	e8 fc ff ff ff       	call   394 <evdev_ioctl+0x28e>
 398:	c7 45 50 00 00 00 00 	movl   $0x0,0x50(%ebp)
 39f:	eb de                	jmp    37f <evdev_ioctl+0x279>
 3a1:	0f b6 c7             	movzbl %bh,%eax
 3a4:	83 f8 45             	cmp    $0x45,%eax
 3a7:	0f 85 37 02 00 00    	jne    5e4 <evdev_ioctl+0x4de>
 3ad:	89 d8                	mov    %ebx,%eax
 3af:	c1 e8 1e             	shr    $0x1e,%eax
 3b2:	83 f8 02             	cmp    $0x2,%eax
 3b5:	0f 85 ae 01 00 00    	jne    569 <evdev_ioctl+0x463>
 3bb:	89 d8                	mov    %ebx,%eax
 3bd:	25 e0 00 00 00       	and    $0xe0,%eax
 3c2:	83 f8 20             	cmp    $0x20,%eax
 3c5:	75 79                	jne    440 <evdev_ioctl+0x33a>
 3c7:	89 d8                	mov    %ebx,%eax
 3c9:	83 e0 1f             	and    $0x1f,%eax
 3cc:	83 f8 15             	cmp    $0x15,%eax
 3cf:	0f 87 0f 02 00 00    	ja     5e4 <evdev_ioctl+0x4de>
 3d5:	ff 24 85 00 00 00 00 	jmp    *0x0(,%eax,4)
 3dc:	8d 46 18             	lea    0x18(%esi),%eax
 3df:	ba 1f 00 00 00       	mov    $0x1f,%edx
 3e4:	eb 42                	jmp    428 <evdev_ioctl+0x322>
 3e6:	8d 46 1c             	lea    0x1c(%esi),%eax
 3e9:	ba ff 01 00 00       	mov    $0x1ff,%edx
 3ee:	eb 38                	jmp    428 <evdev_ioctl+0x322>
 3f0:	8d 46 5c             	lea    0x5c(%esi),%eax
 3f3:	eb 2e                	jmp    423 <evdev_ioctl+0x31d>
 3f5:	8d 46 60             	lea    0x60(%esi),%eax
 3f8:	ba 3f 00 00 00       	mov    $0x3f,%edx
 3fd:	eb 29                	jmp    428 <evdev_ioctl+0x322>
 3ff:	8d 46 68             	lea    0x68(%esi),%eax
 402:	eb 08                	jmp    40c <evdev_ioctl+0x306>
 404:	8d 46 6c             	lea    0x6c(%esi),%eax
 407:	eb 1a                	jmp    423 <evdev_ioctl+0x31d>
 409:	8d 46 70             	lea    0x70(%esi),%eax
 40c:	ba 07 00 00 00       	mov    $0x7,%edx
 411:	eb 15                	jmp    428 <evdev_ioctl+0x322>
 413:	8d 46 74             	lea    0x74(%esi),%eax
 416:	ba 7f 00 00 00       	mov    $0x7f,%edx
 41b:	eb 0b                	jmp    428 <evdev_ioctl+0x322>
 41d:	8d 86 84 00 00 00    	lea    0x84(%esi),%eax
 423:	ba 0f 00 00 00       	mov    $0xf,%edx
 428:	c1 eb 10             	shr    $0x10,%ebx
 42b:	81 e3 ff 3f 00 00    	and    $0x3fff,%ebx
 431:	89 d9                	mov    %ebx,%ecx
 433:	c7 44 24 04 00 00 00 	movl   $0x0,0x4(%esp)
 43a:	00 
 43b:	89 3c 24             	mov    %edi,(%esp)
 43e:	eb 29                	jmp    469 <evdev_ioctl+0x363>
 440:	0f b6 c3             	movzbl %bl,%eax
 443:	83 f8 18             	cmp    $0x18,%eax
 446:	75 2b                	jne    473 <evdev_ioctl+0x36d>
 448:	c1 eb 10             	shr    $0x10,%ebx
 44b:	ba ff 01 00 00       	mov    $0x1ff,%edx
 450:	81 e3 ff 3f 00 00    	and    $0x3fff,%ebx
 456:	8d 86 cc 01 00 00    	lea    0x1cc(%esi),%eax
 45c:	89 d9                	mov    %ebx,%ecx
 45e:	c7 44 24 04 00 00 00 	movl   $0x0,0x4(%esp)
 465:	00 
 466:	89 3c 24             	mov    %edi,(%esp)
 469:	e8 6d fc ff ff       	call   db <bits_to_user>
 46e:	e9 76 01 00 00       	jmp    5e9 <evdev_ioctl+0x4e3>
 473:	83 f8 19             	cmp    $0x19,%eax
 476:	75 08                	jne    480 <evdev_ioctl+0x37a>
 478:	8d 86 0c 02 00 00    	lea    0x20c(%esi),%eax
 47e:	eb 33                	jmp    4b3 <evdev_ioctl+0x3ad>
 480:	83 f8 1a             	cmp    $0x1a,%eax
 483:	75 23                	jne    4a8 <evdev_ioctl+0x3a2>
 485:	c1 eb 10             	shr    $0x10,%ebx
 488:	ba 07 00 00 00       	mov    $0x7,%edx
 48d:	81 e3 ff 3f 00 00    	and    $0x3fff,%ebx
 493:	8d 86 10 02 00 00    	lea    0x210(%esi),%eax
 499:	89 d9                	mov    %ebx,%ecx
 49b:	c7 44 24 04 00 00 00 	movl   $0x0,0x4(%esp)
 4a2:	00 
 4a3:	89 3c 24             	mov    %edi,(%esp)
 4a6:	eb c1                	jmp    469 <evdev_ioctl+0x363>
 4a8:	83 f8 1b             	cmp    $0x1b,%eax
 4ab:	75 23                	jne    4d0 <evdev_ioctl+0x3ca>
 4ad:	8d 86 14 02 00 00    	lea    0x214(%esi),%eax
 4b3:	c1 eb 10             	shr    $0x10,%ebx
 4b6:	ba 0f 00 00 00       	mov    $0xf,%edx
 4bb:	81 e3 ff 3f 00 00    	and    $0x3fff,%ebx
 4c1:	89 d9                	mov    %ebx,%ecx
 4c3:	c7 44 24 04 00 00 00 	movl   $0x0,0x4(%esp)
 4ca:	00 
 4cb:	89 3c 24             	mov    %edi,(%esp)
 4ce:	eb 99                	jmp    469 <evdev_ioctl+0x363>
 4d0:	83 f8 06             	cmp    $0x6,%eax
 4d3:	75 05                	jne    4da <evdev_ioctl+0x3d4>
 4d5:	8b 46 04             	mov    0x4(%esi),%eax
 4d8:	eb 12                	jmp    4ec <evdev_ioctl+0x3e6>
 4da:	83 f8 07             	cmp    $0x7,%eax
 4dd:	75 05                	jne    4e4 <evdev_ioctl+0x3de>
 4df:	8b 46 08             	mov    0x8(%esi),%eax
 4e2:	eb 08                	jmp    4ec <evdev_ioctl+0x3e6>
 4e4:	83 f8 08             	cmp    $0x8,%eax
 4e7:	75 1a                	jne    503 <evdev_ioctl+0x3fd>
 4e9:	8b 46 0c             	mov    0xc(%esi),%eax
 4ec:	c1 eb 10             	shr    $0x10,%ebx
 4ef:	89 f9                	mov    %edi,%ecx
 4f1:	81 e3 ff 3f 00 00    	and    $0x3fff,%ebx
 4f7:	89 da                	mov    %ebx,%edx
 4f9:	e8 9e fb ff ff       	call   9c <str_to_user>
 4fe:	e9 e6 00 00 00       	jmp    5e9 <evdev_ioctl+0x4e3>
 503:	89 d8                	mov    %ebx,%eax
 505:	25 c0 00 00 00       	and    $0xc0,%eax
 50a:	83 f8 40             	cmp    $0x40,%eax
 50d:	0f 85 d1 00 00 00    	jne    5e4 <evdev_ioctl+0x4de>
 513:	89 da                	mov    %ebx,%edx
 515:	b9 14 00 00 00       	mov    $0x14,%ecx
 51a:	83 e2 3f             	and    $0x3f,%edx
 51d:	8b 84 96 c4 00 00 00 	mov    0xc4(%esi,%edx,4),%eax
 524:	89 44 24 3c          	mov    %eax,0x3c(%esp)
 528:	8b 84 96 18 03 00 00 	mov    0x318(%esi,%edx,4),%eax
 52f:	89 44 24 40          	mov    %eax,0x40(%esp)
 533:	8b 84 96 18 02 00 00 	mov    0x218(%esi,%edx,4),%eax
 53a:	89 44 24 44          	mov    %eax,0x44(%esp)
 53e:	8b 84 96 18 04 00 00 	mov    0x418(%esi,%edx,4),%eax
 545:	89 44 24 48          	mov    %eax,0x48(%esp)
 549:	8b 84 96 18 05 00 00 	mov    0x518(%esi,%edx,4),%eax
 550:	8d 54 24 3c          	lea    0x3c(%esp),%edx
 554:	89 44 24 4c          	mov    %eax,0x4c(%esp)
 558:	89 f8                	mov    %edi,%eax
 55a:	e8 fc ff ff ff       	call   55b <evdev_ioctl+0x455>
 55f:	85 c0                	test   %eax,%eax
 561:	0f 84 18 fe ff ff    	je     37f <evdev_ioctl+0x279>
 567:	eb 66                	jmp    5cf <evdev_ioctl+0x4c9>
 569:	48                   	dec    %eax
 56a:	75 78                	jne    5e4 <evdev_ioctl+0x4de>
 56c:	89 d8                	mov    %ebx,%eax
 56e:	25 c0 00 00 00       	and    $0xc0,%eax
 573:	3d c0 00 00 00       	cmp    $0xc0,%eax
 578:	75 6a                	jne    5e4 <evdev_ioctl+0x4de>
 57a:	8d 44 24 3c          	lea    0x3c(%esp),%eax
 57e:	b9 14 00 00 00       	mov    $0x14,%ecx
 583:	89 fa                	mov    %edi,%edx
 585:	e8 fc ff ff ff       	call   586 <evdev_ioctl+0x480>
 58a:	85 c0                	test   %eax,%eax
 58c:	75 41                	jne    5cf <evdev_ioctl+0x4c9>
 58e:	8b 44 24 3c          	mov    0x3c(%esp),%eax
 592:	89 da                	mov    %ebx,%edx
 594:	83 e2 3f             	and    $0x3f,%edx
 597:	89 84 96 c4 00 00 00 	mov    %eax,0xc4(%esi,%edx,4)
 59e:	8b 44 24 40          	mov    0x40(%esp),%eax
 5a2:	89 84 96 18 03 00 00 	mov    %eax,0x318(%esi,%edx,4)
 5a9:	8b 44 24 44          	mov    0x44(%esp),%eax
 5ad:	89 84 96 18 02 00 00 	mov    %eax,0x218(%esi,%edx,4)
 5b4:	8b 44 24 48          	mov    0x48(%esp),%eax
 5b8:	89 84 96 18 04 00 00 	mov    %eax,0x418(%esi,%edx,4)
 5bf:	8b 44 24 4c          	mov    0x4c(%esp),%eax
 5c3:	89 84 96 18 05 00 00 	mov    %eax,0x518(%esi,%edx,4)
 5ca:	e9 b0 fd ff ff       	jmp    37f <evdev_ioctl+0x279>
 5cf:	b8 f2 ff ff ff       	mov    $0xfffffff2,%eax
 5d4:	eb 13                	jmp    5e9 <evdev_ioctl+0x4e3>
 5d6:	b8 da ff ff ff       	mov    $0xffffffda,%eax
 5db:	eb 0c                	jmp    5e9 <evdev_ioctl+0x4e3>
 5dd:	b8 f0 ff ff ff       	mov    $0xfffffff0,%eax
 5e2:	eb 05                	jmp    5e9 <evdev_ioctl+0x4e3>
 5e4:	b8 ea ff ff ff       	mov    $0xffffffea,%eax
 5e9:	83 c4 54             	add    $0x54,%esp
 5ec:	5b                   	pop    %ebx
 5ed:	5e                   	pop    %esi
 5ee:	5f                   	pop    %edi
 5ef:	5d                   	pop    %ebp
 5f0:	c3                   	ret    

000005f1 <evdev_disconnect>:
 5f1:	56                   	push   %esi
 5f2:	53                   	push   %ebx
 5f3:	89 c3                	mov    %eax,%ebx
 5f5:	83 ec 04             	sub    $0x4,%esp
 5f8:	8b 30                	mov    (%eax),%esi
 5fa:	e8 fc ff ff ff       	call   5fb <evdev_disconnect+0xa>
 5ff:	b8 1c 00 00 00       	mov    $0x1c,%eax
 604:	8d 56 0c             	lea    0xc(%esi),%edx
 607:	e8 fc ff ff ff       	call   608 <evdev_disconnect+0x17>
 60c:	8b 56 08             	mov    0x8(%esi),%edx
 60f:	b8 00 00 00 00       	mov    $0x0,%eax
 614:	83 c2 40             	add    $0x40,%edx
 617:	81 ca 00 00 d0 00    	or     $0xd00000,%edx
 61d:	e8 fc ff ff ff       	call   61e <evdev_disconnect+0x2d>
 622:	83 7e 04 00          	cmpl   $0x0,0x4(%esi)
 626:	c7 06 00 00 00 00    	movl   $0x0,(%esi)
 62c:	74 6a                	je     698 <evdev_disconnect+0xa7>
 62e:	31 d2                	xor    %edx,%edx
 630:	89 d8                	mov    %ebx,%eax
 632:	e8 fc ff ff ff       	call   633 <evdev_disconnect+0x42>
 637:	89 d8                	mov    %ebx,%eax
 639:	e8 fc ff ff ff       	call   63a <evdev_disconnect+0x49>
 63e:	8b 5e 54             	mov    0x54(%esi),%ebx
 641:	eb 1b                	jmp    65e <evdev_disconnect+0x6d>
 643:	8d 83 08 04 00 00    	lea    0x408(%ebx),%eax
 649:	b9 06 00 02 00       	mov    $0x20006,%ecx
 64e:	ba 1d 00 00 00       	mov    $0x1d,%edx
 653:	e8 fc ff ff ff       	call   654 <evdev_disconnect+0x63>
 658:	8b 9b 10 04 00 00    	mov    0x410(%ebx),%ebx
 65e:	81 eb 10 04 00 00    	sub    $0x410,%ebx
 664:	8b 83 10 04 00 00    	mov    0x410(%ebx),%eax
 66a:	8d 74 26 00          	lea    0x0(%esi),%esi
 66e:	8d 93 10 04 00 00    	lea    0x410(%ebx),%edx
 674:	8d 46 54             	lea    0x54(%esi),%eax
 677:	39 c2                	cmp    %eax,%edx
 679:	75 c8                	jne    643 <evdev_disconnect+0x52>
 67b:	8d 46 40             	lea    0x40(%esi),%eax
 67e:	b9 01 00 00 00       	mov    $0x1,%ecx
 683:	ba 01 00 00 00       	mov    $0x1,%edx
 688:	c7 04 24 00 00 00 00 	movl   $0x0,(%esp)
 68f:	e8 fc ff ff ff       	call   690 <evdev_disconnect+0x9f>
 694:	5b                   	pop    %ebx
 695:	5b                   	pop    %ebx
 696:	5e                   	pop    %esi
 697:	c3                   	ret    
 698:	59                   	pop    %ecx
 699:	89 f0                	mov    %esi,%eax
 69b:	5b                   	pop    %ebx
 69c:	5e                   	pop    %esi
 69d:	e9 c6 f9 ff ff       	jmp    68 <evdev_free>

000006a2 <evdev_connect>:
 6a2:	55                   	push   %ebp
 6a3:	89 c5                	mov    %eax,%ebp
 6a5:	57                   	push   %edi
 6a6:	56                   	push   %esi
 6a7:	53                   	push   %ebx
 6a8:	83 ec 1c             	sub    $0x1c,%esp
 6ab:	89 54 24 14          	mov    %edx,0x14(%esp)
 6af:	c7 44 24 18 00 00 00 	movl   $0x0,0x18(%esp)
 6b6:	00 
 6b7:	eb 0b                	jmp    6c4 <evdev_connect+0x22>
 6b9:	ff 44 24 18          	incl   0x18(%esp)
 6bd:	83 7c 24 18 20       	cmpl   $0x20,0x18(%esp)
 6c2:	74 10                	je     6d4 <evdev_connect+0x32>
 6c4:	8b 44 24 18          	mov    0x18(%esp),%eax
 6c8:	83 3c 85 00 00 00 00 	cmpl   $0x0,0x0(,%eax,4)
 6cf:	00 
 6d0:	75 e7                	jne    6b9 <evdev_connect+0x17>
 6d2:	eb 16                	jmp    6ea <evdev_connect+0x48>
 6d4:	c7 04 24 00 00 00 00 	movl   $0x0,(%esp)
 6db:	be e9 ff ff ff       	mov    $0xffffffe9,%esi
 6e0:	e8 fc ff ff ff       	call   6e1 <evdev_connect+0x3f>
 6e5:	e9 00 01 00 00       	jmp    7ea <evdev_connect+0x148>
 6ea:	a1 1c 00 00 00       	mov    0x1c,%eax
 6ef:	ba d0 00 00 00       	mov    $0xd0,%edx
 6f4:	be f4 ff ff ff       	mov    $0xfffffff4,%esi
 6f9:	e8 fc ff ff ff       	call   6fa <evdev_connect+0x58>
 6fe:	85 c0                	test   %eax,%eax
 700:	89 c3                	mov    %eax,%ebx
 702:	0f 84 e2 00 00 00    	je     7ea <evdev_connect+0x148>
 708:	8d 40 54             	lea    0x54(%eax),%eax
 70b:	89 43 54             	mov    %eax,0x54(%ebx)
 70e:	8d 7b 0c             	lea    0xc(%ebx),%edi
 711:	89 40 04             	mov    %eax,0x4(%eax)
 714:	8d 43 40             	lea    0x40(%ebx),%eax
 717:	e8 fc ff ff ff       	call   718 <evdev_connect+0x76>
 71c:	c7 03 01 00 00 00    	movl   $0x1,(%ebx)
 722:	8b 54 24 18          	mov    0x18(%esp),%edx
 726:	89 53 08             	mov    %edx,0x8(%ebx)
 729:	8b 44 24 14          	mov    0x14(%esp),%eax
 72d:	89 6b 2c             	mov    %ebp,0x2c(%ebx)
 730:	89 7b 24             	mov    %edi,0x24(%ebx)
 733:	89 5b 1c             	mov    %ebx,0x1c(%ebx)
 736:	89 43 28             	mov    %eax,0x28(%ebx)
 739:	89 54 24 08          	mov    %edx,0x8(%esp)
 73d:	c7 44 24 04 26 00 00 	movl   $0x26,0x4(%esp)
 744:	00 
 745:	89 3c 24             	mov    %edi,(%esp)
 748:	e8 fc ff ff ff       	call   749 <evdev_connect+0xa7>
 74d:	8b 54 24 18          	mov    0x18(%esp),%edx
 751:	89 7c 24 10          	mov    %edi,0x10(%esp)
 755:	89 1c 95 00 00 00 00 	mov    %ebx,0x0(,%edx,4)
 75c:	89 d5                	mov    %edx,%ebp
 75e:	8b 54 24 14          	mov    0x14(%esp),%edx
 762:	83 c5 40             	add    $0x40,%ebp
 765:	81 cd 00 00 d0 00    	or     $0xd00000,%ebp
 76b:	8b 82 b0 06 00 00    	mov    0x6b0(%edx),%eax
 771:	89 6c 24 08          	mov    %ebp,0x8(%esp)
 775:	c7 04 24 00 00 00 00 	movl   $0x0,(%esp)
 77c:	89 44 24 0c          	mov    %eax,0xc(%esp)
 780:	89 d0                	mov    %edx,%eax
 782:	05 44 06 00 00       	add    $0x644,%eax
 787:	89 44 24 04          	mov    %eax,0x4(%esp)
 78b:	e8 fc ff ff ff       	call   78c <evdev_connect+0xea>
 790:	3d 00 f0 ff ff       	cmp    $0xfffff000,%eax
 795:	89 c6                	mov    %eax,%esi
 797:	77 3b                	ja     7d4 <evdev_connect+0x132>
 799:	8d 50 08             	lea    0x8(%eax),%edx
 79c:	89 f9                	mov    %edi,%ecx
 79e:	b8 1c 00 00 00       	mov    $0x1c,%eax
 7a3:	e8 fc ff ff ff       	call   7a4 <evdev_connect+0x102>
 7a8:	85 c0                	test   %eax,%eax
 7aa:	89 c6                	mov    %eax,%esi
 7ac:	75 1a                	jne    7c8 <evdev_connect+0x126>
 7ae:	8d 43 1c             	lea    0x1c(%ebx),%eax
 7b1:	e8 fc ff ff ff       	call   7b2 <evdev_connect+0x110>
 7b6:	85 c0                	test   %eax,%eax
 7b8:	89 c6                	mov    %eax,%esi
 7ba:	74 2e                	je     7ea <evdev_connect+0x148>
 7bc:	89 fa                	mov    %edi,%edx
 7be:	b8 1c 00 00 00       	mov    $0x1c,%eax
 7c3:	e8 fc ff ff ff       	call   7c4 <evdev_connect+0x122>
 7c8:	89 ea                	mov    %ebp,%edx
 7ca:	b8 00 00 00 00       	mov    $0x0,%eax
 7cf:	e8 fc ff ff ff       	call   7d0 <evdev_connect+0x12e>
 7d4:	89 d8                	mov    %ebx,%eax
 7d6:	e8 fc ff ff ff       	call   7d7 <evdev_connect+0x135>
 7db:	8b 44 24 18          	mov    0x18(%esp),%eax
 7df:	c7 04 85 00 00 00 00 	movl   $0x0,0x0(,%eax,4)
 7e6:	00 00 00 00 
 7ea:	83 c4 1c             	add    $0x1c,%esp
 7ed:	89 f0                	mov    %esi,%eax
 7ef:	5b                   	pop    %ebx
 7f0:	5e                   	pop    %esi
 7f1:	5f                   	pop    %edi
 7f2:	5d                   	pop    %ebp
 7f3:	c3                   	ret    

000007f4 <evdev_event>:
 7f4:	55                   	push   %ebp
 7f5:	89 cd                	mov    %ecx,%ebp
 7f7:	57                   	push   %edi
 7f8:	89 d7                	mov    %edx,%edi
 7fa:	56                   	push   %esi
 7fb:	53                   	push   %ebx
 7fc:	83 ec 04             	sub    $0x4,%esp
 7ff:	8b 54 24 18          	mov    0x18(%esp),%edx
 803:	89 14 24             	mov    %edx,(%esp)
 806:	8b 30                	mov    (%eax),%esi
 808:	8b 5e 50             	mov    0x50(%esi),%ebx
 80b:	85 db                	test   %ebx,%ebx
 80d:	74 67                	je     876 <evdev_event+0x82>
 80f:	8b 83 00 04 00 00    	mov    0x400(%ebx),%eax
 815:	c1 e0 04             	shl    $0x4,%eax
 818:	8d 04 03             	lea    (%ebx,%eax,1),%eax
 81b:	e8 fc ff ff ff       	call   81c <evdev_event+0x28>
 820:	8b 83 00 04 00 00    	mov    0x400(%ebx),%eax
 826:	b9 01 00 02 00       	mov    $0x20001,%ecx
 82b:	c1 e0 04             	shl    $0x4,%eax
 82e:	66 89 7c 18 08       	mov    %di,0x8(%eax,%ebx,1)
 833:	8b 83 00 04 00 00    	mov    0x400(%ebx),%eax
 839:	c1 e0 04             	shl    $0x4,%eax
 83c:	66 89 6c 18 0a       	mov    %bp,0xa(%eax,%ebx,1)
 841:	8b 83 00 04 00 00    	mov    0x400(%ebx),%eax
 847:	8b 14 24             	mov    (%esp),%edx
 84a:	c1 e0 04             	shl    $0x4,%eax
 84d:	89 54 18 0c          	mov    %edx,0xc(%eax,%ebx,1)
 851:	ba 1d 00 00 00       	mov    $0x1d,%edx
 856:	8b 83 00 04 00 00    	mov    0x400(%ebx),%eax
 85c:	40                   	inc    %eax
 85d:	83 e0 3f             	and    $0x3f,%eax
 860:	89 83 00 04 00 00    	mov    %eax,0x400(%ebx)
 866:	8d 83 08 04 00 00    	lea    0x408(%ebx),%eax
 86c:	e8 fc ff ff ff       	call   86d <evdev_event+0x79>
 871:	e9 8e 00 00 00       	jmp    904 <evdev_event+0x110>
 876:	8b 5e 54             	mov    0x54(%esi),%ebx
 879:	eb 68                	jmp    8e3 <evdev_event+0xef>
 87b:	8b 83 00 04 00 00    	mov    0x400(%ebx),%eax
 881:	c1 e0 04             	shl    $0x4,%eax
 884:	8d 04 03             	lea    (%ebx,%eax,1),%eax
 887:	e8 fc ff ff ff       	call   888 <evdev_event+0x94>
 88c:	8b 83 00 04 00 00    	mov    0x400(%ebx),%eax
 892:	b9 01 00 02 00       	mov    $0x20001,%ecx
 897:	c1 e0 04             	shl    $0x4,%eax
 89a:	66 89 7c 18 08       	mov    %di,0x8(%eax,%ebx,1)
 89f:	8b 83 00 04 00 00    	mov    0x400(%ebx),%eax
 8a5:	c1 e0 04             	shl    $0x4,%eax
 8a8:	66 89 6c 18 0a       	mov    %bp,0xa(%eax,%ebx,1)
 8ad:	8b 83 00 04 00 00    	mov    0x400(%ebx),%eax
 8b3:	8b 14 24             	mov    (%esp),%edx
 8b6:	c1 e0 04             	shl    $0x4,%eax
 8b9:	89 54 18 0c          	mov    %edx,0xc(%eax,%ebx,1)
 8bd:	ba 1d 00 00 00       	mov    $0x1d,%edx
 8c2:	8b 83 00 04 00 00    	mov    0x400(%ebx),%eax
 8c8:	40                   	inc    %eax
 8c9:	83 e0 3f             	and    $0x3f,%eax
 8cc:	89 83 00 04 00 00    	mov    %eax,0x400(%ebx)
 8d2:	8d 83 08 04 00 00    	lea    0x408(%ebx),%eax
 8d8:	e8 fc ff ff ff       	call   8d9 <evdev_event+0xe5>
 8dd:	8b 9b 10 04 00 00    	mov    0x410(%ebx),%ebx
 8e3:	81 eb 10 04 00 00    	sub    $0x410,%ebx
 8e9:	8b 83 10 04 00 00    	mov    0x410(%ebx),%eax
 8ef:	8d 74 26 00          	lea    0x0(%esi),%esi
 8f3:	8d 93 10 04 00 00    	lea    0x410(%ebx),%edx
 8f9:	8d 46 54             	lea    0x54(%esi),%eax
 8fc:	39 c2                	cmp    %eax,%edx
 8fe:	0f 85 77 ff ff ff    	jne    87b <evdev_event+0x87>
 904:	8d 46 40             	lea    0x40(%esi),%eax
 907:	b9 01 00 00 00       	mov    $0x1,%ecx
 90c:	c7 44 24 18 00 00 00 	movl   $0x0,0x18(%esp)
 913:	00 
 914:	ba 01 00 00 00       	mov    $0x1,%edx
 919:	5e                   	pop    %esi
 91a:	5b                   	pop    %ebx
 91b:	5e                   	pop    %esi
 91c:	5f                   	pop    %edi
 91d:	5d                   	pop    %ebp
 91e:	e9 fc ff ff ff       	jmp    91f <evdev_event+0x12b>

00000923 <evdev_release>:
 923:	57                   	push   %edi
 924:	89 d7                	mov    %edx,%edi
 926:	56                   	push   %esi
 927:	53                   	push   %ebx
 928:	8b b2 80 00 00 00    	mov    0x80(%edx),%esi
 92e:	8b 9e 0c 04 00 00    	mov    0x40c(%esi),%ebx
 934:	39 73 50             	cmp    %esi,0x50(%ebx)
 937:	75 0f                	jne    948 <evdev_release+0x25>
 939:	8d 43 1c             	lea    0x1c(%ebx),%eax
 93c:	e8 fc ff ff ff       	call   93d <evdev_release+0x1a>
 941:	c7 43 50 00 00 00 00 	movl   $0x0,0x50(%ebx)
 948:	31 c9                	xor    %ecx,%ecx
 94a:	89 fa                	mov    %edi,%edx
 94c:	83 c8 ff             	or     $0xffffffff,%eax
 94f:	e8 f0 f6 ff ff       	call   44 <evdev_fasync>
 954:	8d 8e 10 04 00 00    	lea    0x410(%esi),%ecx
 95a:	8b 96 10 04 00 00    	mov    0x410(%esi),%edx
 960:	8b 41 04             	mov    0x4(%ecx),%eax
 963:	89 42 04             	mov    %eax,0x4(%edx)
 966:	89 10                	mov    %edx,(%eax)
 968:	89 f0                	mov    %esi,%eax
 96a:	c7 86 10 04 00 00 00 	movl   $0x100100,0x410(%esi)
 971:	01 10 00 
 974:	c7 41 04 00 02 20 00 	movl   $0x200200,0x4(%ecx)
 97b:	e8 fc ff ff ff       	call   97c <evdev_release+0x59>
 980:	8b 43 04             	mov    0x4(%ebx),%eax
 983:	48                   	dec    %eax
 984:	85 c0                	test   %eax,%eax
 986:	89 43 04             	mov    %eax,0x4(%ebx)
 989:	75 16                	jne    9a1 <evdev_release+0x7e>
 98b:	83 3b 00             	cmpl   $0x0,(%ebx)
 98e:	74 0a                	je     99a <evdev_release+0x77>
 990:	8d 43 1c             	lea    0x1c(%ebx),%eax
 993:	e8 fc ff ff ff       	call   994 <evdev_release+0x71>
 998:	eb 07                	jmp    9a1 <evdev_release+0x7e>
 99a:	89 d8                	mov    %ebx,%eax
 99c:	e8 c7 f6 ff ff       	call   68 <evdev_free>
 9a1:	5b                   	pop    %ebx
 9a2:	31 c0                	xor    %eax,%eax
 9a4:	5e                   	pop    %esi
 9a5:	5f                   	pop    %edi
 9a6:	c3                   	ret    

000009a7 <evdev_write>:
 9a7:	55                   	push   %ebp
 9a8:	89 cd                	mov    %ecx,%ebp
 9aa:	57                   	push   %edi
 9ab:	56                   	push   %esi
 9ac:	be ed ff ff ff       	mov    $0xffffffed,%esi
 9b1:	53                   	push   %ebx
 9b2:	83 ec 18             	sub    $0x18,%esp
 9b5:	89 54 24 04          	mov    %edx,0x4(%esp)
 9b9:	8b 80 80 00 00 00    	mov    0x80(%eax),%eax
 9bf:	8b b8 0c 04 00 00    	mov    0x40c(%eax),%edi
 9c5:	83 3f 00             	cmpl   $0x0,(%edi)
 9c8:	74 47                	je     a11 <evdev_write+0x6a>
 9ca:	eb 1f                	jmp    9eb <evdev_write+0x44>
 9cc:	8b 54 24 04          	mov    0x4(%esp),%edx
 9d0:	8d 44 24 08          	lea    0x8(%esp),%eax
 9d4:	b9 10 00 00 00       	mov    $0x10,%ecx
 9d9:	01 f2                	add    %esi,%edx
 9db:	e8 fc ff ff ff       	call   9dc <evdev_write+0x35>
 9e0:	85 c0                	test   %eax,%eax
 9e2:	74 0f                	je     9f3 <evdev_write+0x4c>
 9e4:	be f2 ff ff ff       	mov    $0xfffffff2,%esi
 9e9:	eb 26                	jmp    a11 <evdev_write+0x6a>
 9eb:	31 f6                	xor    %esi,%esi
 9ed:	39 ee                	cmp    %ebp,%esi
 9ef:	72 db                	jb     9cc <evdev_write+0x25>
 9f1:	eb 1e                	jmp    a11 <evdev_write+0x6a>
 9f3:	8b 5c 24 14          	mov    0x14(%esp),%ebx
 9f7:	8d 47 1c             	lea    0x1c(%edi),%eax
 9fa:	83 c6 10             	add    $0x10,%esi
 9fd:	0f b7 4c 24 12       	movzwl 0x12(%esp),%ecx
 a02:	0f b7 54 24 10       	movzwl 0x10(%esp),%edx
 a07:	89 1c 24             	mov    %ebx,(%esp)
 a0a:	e8 fc ff ff ff       	call   a0b <evdev_write+0x64>
 a0f:	eb dc                	jmp    9ed <evdev_write+0x46>
 a11:	83 c4 18             	add    $0x18,%esp
 a14:	89 f0                	mov    %esi,%eax
 a16:	5b                   	pop    %ebx
 a17:	5e                   	pop    %esi
 a18:	5f                   	pop    %edi
 a19:	5d                   	pop    %ebp
 a1a:	c3                   	ret    

00000a1b <evdev_read>:
 a1b:	55                   	push   %ebp
 a1c:	89 cd                	mov    %ecx,%ebp
 a1e:	57                   	push   %edi
 a1f:	89 c7                	mov    %eax,%edi
 a21:	56                   	push   %esi
 a22:	53                   	push   %ebx
 a23:	83 ec 18             	sub    $0x18,%esp
 a26:	83 f9 0f             	cmp    $0xf,%ecx
 a29:	89 14 24             	mov    %edx,(%esp)
 a2c:	8b 98 80 00 00 00    	mov    0x80(%eax),%ebx
 a32:	b8 ea ff ff ff       	mov    $0xffffffea,%eax
 a37:	8b b3 0c 04 00 00    	mov    0x40c(%ebx),%esi
 a3d:	0f 86 0e 01 00 00    	jbe    b51 <evdev_read+0x136>
 a43:	8b 83 04 04 00 00    	mov    0x404(%ebx),%eax
 a49:	39 83 00 04 00 00    	cmp    %eax,0x400(%ebx)
 a4f:	75 14                	jne    a65 <evdev_read+0x4a>
 a51:	83 3e 00             	cmpl   $0x0,(%esi)
 a54:	74 0f                	je     a65 <evdev_read+0x4a>
 a56:	f6 47 19 08          	testb  $0x8,0x19(%edi)
 a5a:	b8 f5 ff ff ff       	mov    $0xfffffff5,%eax
 a5f:	0f 85 ec 00 00 00    	jne    b51 <evdev_read+0x136>
 a65:	8b 83 04 04 00 00    	mov    0x404(%ebx),%eax
 a6b:	39 83 00 04 00 00    	cmp    %eax,0x400(%ebx)
 a71:	75 76                	jne    ae9 <evdev_read+0xce>
 a73:	83 3e 00             	cmpl   $0x0,(%esi)
 a76:	74 71                	je     ae9 <evdev_read+0xce>
 a78:	fc                   	cld    
 a79:	31 c0                	xor    %eax,%eax
 a7b:	8d 7c 24 04          	lea    0x4(%esp),%edi
 a7f:	ab                   	stos   %eax,%es:(%edi)
 a80:	ab                   	stos   %eax,%es:(%edi)
 a81:	ab                   	stos   %eax,%es:(%edi)
 a82:	c7 44 24 0c 00 00 00 	movl   $0x0,0xc(%esp)
 a89:	00 
 a8a:	ab                   	stos   %eax,%es:(%edi)
 a8b:	ab                   	stos   %eax,%es:(%edi)
 a8c:	64 a1 00 00 00 00    	mov    %fs:0x0,%eax
 a92:	89 44 24 08          	mov    %eax,0x8(%esp)
 a96:	8d 44 24 10          	lea    0x10(%esp),%eax
 a9a:	89 44 24 10          	mov    %eax,0x10(%esp)
 a9e:	89 44 24 14          	mov    %eax,0x14(%esp)
 aa2:	8d 46 40             	lea    0x40(%esi),%eax
 aa5:	b9 01 00 00 00       	mov    $0x1,%ecx
 aaa:	8d 54 24 04          	lea    0x4(%esp),%edx
 aae:	e8 fc ff ff ff       	call   aaf <evdev_read+0x94>
 ab3:	8b 83 04 04 00 00    	mov    0x404(%ebx),%eax
 ab9:	39 83 00 04 00 00    	cmp    %eax,0x400(%ebx)
 abf:	75 1c                	jne    add <evdev_read+0xc2>
 ac1:	83 3e 00             	cmpl   $0x0,(%esi)
 ac4:	74 17                	je     add <evdev_read+0xc2>
 ac6:	64 a1 00 00 00 00    	mov    %fs:0x0,%eax
 acc:	8b 40 04             	mov    0x4(%eax),%eax
 acf:	8b 40 08             	mov    0x8(%eax),%eax
 ad2:	a8 04                	test   $0x4,%al
 ad4:	75 6a                	jne    b40 <evdev_read+0x125>
 ad6:	e8 fc ff ff ff       	call   ad7 <evdev_read+0xbc>
 adb:	eb c5                	jmp    aa2 <evdev_read+0x87>
 add:	8d 46 40             	lea    0x40(%esi),%eax
 ae0:	8d 54 24 04          	lea    0x4(%esp),%edx
 ae4:	e8 fc ff ff ff       	call   ae5 <evdev_read+0xca>
 ae9:	83 3e 00             	cmpl   $0x0,(%esi)
 aec:	b8 ed ff ff ff       	mov    $0xffffffed,%eax
 af1:	74 5e                	je     b51 <evdev_read+0x136>
 af3:	eb 1e                	jmp    b13 <evdev_read+0xf8>
 af5:	03 04 24             	add    (%esp),%eax
 af8:	b9 10 00 00 00       	mov    $0x10,%ecx
 afd:	c1 e2 04             	shl    $0x4,%edx
 b00:	8d 14 13             	lea    (%ebx,%edx,1),%edx
 b03:	e8 fc ff ff ff       	call   b04 <evdev_read+0xe9>
 b08:	85 c0                	test   %eax,%eax
 b0a:	74 20                	je     b2c <evdev_read+0x111>
 b0c:	b8 f2 ff ff ff       	mov    $0xfffffff2,%eax
 b11:	eb 3e                	jmp    b51 <evdev_read+0x136>
 b13:	31 c0                	xor    %eax,%eax
 b15:	8b 93 04 04 00 00    	mov    0x404(%ebx),%edx
 b1b:	39 93 00 04 00 00    	cmp    %edx,0x400(%ebx)
 b21:	74 2e                	je     b51 <evdev_read+0x136>
 b23:	8d 70 10             	lea    0x10(%eax),%esi
 b26:	39 ee                	cmp    %ebp,%esi
 b28:	76 cb                	jbe    af5 <evdev_read+0xda>
 b2a:	eb 25                	jmp    b51 <evdev_read+0x136>
 b2c:	8b 83 04 04 00 00    	mov    0x404(%ebx),%eax
 b32:	40                   	inc    %eax
 b33:	83 e0 3f             	and    $0x3f,%eax
 b36:	89 83 04 04 00 00    	mov    %eax,0x404(%ebx)
 b3c:	89 f0                	mov    %esi,%eax
 b3e:	eb d5                	jmp    b15 <evdev_read+0xfa>
 b40:	8d 46 40             	lea    0x40(%esi),%eax
 b43:	8d 54 24 04          	lea    0x4(%esp),%edx
 b47:	e8 fc ff ff ff       	call   b48 <evdev_read+0x12d>
 b4c:	b8 00 fe ff ff       	mov    $0xfffffe00,%eax
 b51:	83 c4 18             	add    $0x18,%esp
 b54:	5b                   	pop    %ebx
 b55:	5e                   	pop    %esi
 b56:	5f                   	pop    %edi
 b57:	5d                   	pop    %ebp
 b58:	c3                   	ret    

00000b59 <evdev_open>:
 b59:	55                   	push   %ebp
 b5a:	57                   	push   %edi
 b5b:	56                   	push   %esi
 b5c:	53                   	push   %ebx
 b5d:	83 ec 04             	sub    $0x4,%esp
 b60:	89 14 24             	mov    %edx,(%esp)
 b63:	8b 40 34             	mov    0x34(%eax),%eax
 b66:	25 ff ff 0f 00       	and    $0xfffff,%eax
 b6b:	83 e8 40             	sub    $0x40,%eax
 b6e:	83 f8 1f             	cmp    $0x1f,%eax
 b71:	0f 8f a4 00 00 00    	jg     c1b <evdev_open+0xc2>
 b77:	8b 1c 85 00 00 00 00 	mov    0x0(,%eax,4),%ebx
 b7e:	85 db                	test   %ebx,%ebx
 b80:	0f 84 95 00 00 00    	je     c1b <evdev_open+0xc2>
 b86:	83 3b 00             	cmpl   $0x0,(%ebx)
 b89:	0f 84 8c 00 00 00    	je     c1b <evdev_open+0xc2>
 b8f:	a1 4c 00 00 00       	mov    0x4c,%eax
 b94:	ba d0 00 00 00       	mov    $0xd0,%edx
 b99:	bd f4 ff ff ff       	mov    $0xfffffff4,%ebp
 b9e:	e8 fc ff ff ff       	call   b9f <evdev_open+0x46>
 ba3:	85 c0                	test   %eax,%eax
 ba5:	89 c6                	mov    %eax,%esi
 ba7:	74 77                	je     c20 <evdev_open+0xc7>
 ba9:	89 98 0c 04 00 00    	mov    %ebx,0x40c(%eax)
 baf:	8d b8 10 04 00 00    	lea    0x410(%eax),%edi
 bb5:	8d 43 54             	lea    0x54(%ebx),%eax
 bb8:	8b 50 04             	mov    0x4(%eax),%edx
 bbb:	89 86 10 04 00 00    	mov    %eax,0x410(%esi)
 bc1:	89 78 04             	mov    %edi,0x4(%eax)
 bc4:	89 3a                	mov    %edi,(%edx)
 bc6:	89 57 04             	mov    %edx,0x4(%edi)
 bc9:	8b 43 04             	mov    0x4(%ebx),%eax
 bcc:	40                   	inc    %eax
 bcd:	89 43 04             	mov    %eax,0x4(%ebx)
 bd0:	48                   	dec    %eax
 bd1:	75 3b                	jne    c0e <evdev_open+0xb5>
 bd3:	83 3b 00             	cmpl   $0x0,(%ebx)
 bd6:	74 36                	je     c0e <evdev_open+0xb5>
 bd8:	8d 43 1c             	lea    0x1c(%ebx),%eax
 bdb:	e8 fc ff ff ff       	call   bdc <evdev_open+0x83>
 be0:	85 c0                	test   %eax,%eax
 be2:	89 c5                	mov    %eax,%ebp
 be4:	74 28                	je     c0e <evdev_open+0xb5>
 be6:	8b 47 04             	mov    0x4(%edi),%eax
 be9:	8b 96 10 04 00 00    	mov    0x410(%esi),%edx
 bef:	89 42 04             	mov    %eax,0x4(%edx)
 bf2:	89 10                	mov    %edx,(%eax)
 bf4:	89 f0                	mov    %esi,%eax
 bf6:	c7 86 10 04 00 00 00 	movl   $0x100100,0x410(%esi)
 bfd:	01 10 00 
 c00:	c7 47 04 00 02 20 00 	movl   $0x200200,0x4(%edi)
 c07:	e8 fc ff ff ff       	call   c08 <evdev_open+0xaf>
 c0c:	eb 12                	jmp    c20 <evdev_open+0xc7>
 c0e:	8b 04 24             	mov    (%esp),%eax
 c11:	31 ed                	xor    %ebp,%ebp
 c13:	89 b0 80 00 00 00    	mov    %esi,0x80(%eax)
 c19:	eb 05                	jmp    c20 <evdev_open+0xc7>
 c1b:	bd ed ff ff ff       	mov    $0xffffffed,%ebp
 c20:	5f                   	pop    %edi
 c21:	89 e8                	mov    %ebp,%eax
 c23:	5b                   	pop    %ebx
 c24:	5e                   	pop    %esi
 c25:	5f                   	pop    %edi
 c26:	5d                   	pop    %ebp
 c27:	c3                   	ret    
Disassembly of section .exit.text:

00000000 <cleanup_module>:
   0:	b8 00 00 00 00       	mov    $0x0,%eax
   5:	e9 fc ff ff ff       	jmp    6 <cleanup_module+0x6>
Disassembly of section .altinstr_replacement:

00000000 <.altinstr_replacement>:
   0:	0f 18 00             	prefetchnta (%eax)
   3:	0f 18 00             	prefetchnta (%eax)
Disassembly of section .init.text:

00000000 <init_module>:
   0:	b8 00 00 00 00       	mov    $0x0,%eax
   5:	e9 fc ff ff ff       	jmp    6 <init_module+0x6>
Disassembly of section .rodata:

00000000 <__mod_input_device_table-0x60>:
   0:	dc 03                	faddl  (%ebx)
   2:	00 00                	add    %al,(%eax)
   4:	e6 03                	out    %al,$0x3
   6:	00 00                	add    %al,(%eax)
   8:	f0 03 00             	lock add (%eax),%eax
   b:	00 f5                	add    %dh,%ch
   d:	03 00                	add    (%eax),%eax
   f:	00 ff                	add    %bh,%bh
  11:	03 00                	add    (%eax),%eax
  13:	00 1d 04 00 00 e4    	add    %bl,0xe4000004
  19:	05 00 00 e4 05       	add    $0x5e40000,%eax
  1e:	00 00                	add    %al,(%eax)
  20:	e4 05                	in     $0x5,%al
  22:	00 00                	add    %al,(%eax)
  24:	e4 05                	in     $0x5,%al
  26:	00 00                	add    %al,(%eax)
  28:	e4 05                	in     $0x5,%al
  2a:	00 00                	add    %al,(%eax)
  2c:	e4 05                	in     $0x5,%al
  2e:	00 00                	add    %al,(%eax)
  30:	e4 05                	in     $0x5,%al
  32:	00 00                	add    %al,(%eax)
  34:	e4 05                	in     $0x5,%al
  36:	00 00                	add    %al,(%eax)
  38:	e4 05                	in     $0x5,%al
  3a:	00 00                	add    %al,(%eax)
  3c:	e4 05                	in     $0x5,%al
  3e:	00 00                	add    %al,(%eax)
  40:	e4 05                	in     $0x5,%al
  42:	00 00                	add    %al,(%eax)
  44:	04 04                	add    $0x4,%al
  46:	00 00                	add    %al,(%eax)
  48:	09 04 00             	or     %eax,(%eax,%eax,1)
  4b:	00 e4                	add    %ah,%ah
  4d:	05 00 00 e4 05       	add    $0x5e40000,%eax
  52:	00 00                	add    %al,(%eax)
  54:	13 04 00             	adc    (%eax,%eax,1),%eax
	...

00000060 <__mod_input_device_table>:
	...
  dc:	01 00                	add    %eax,(%eax)
	...

00000160 <evdev_fops>:
	...
 168:	1b 0a                	sbb    (%edx),%ecx
 16a:	00 00                	add    %al,(%eax)
 16c:	a7                   	cmpsl  %es:(%edi),%ds:(%esi)
 16d:	09 00                	or     %eax,(%eax)
	...
 183:	00 06                	add    %al,(%esi)
 185:	01 00                	add    %eax,(%eax)
	...
 18f:	00 59 0b             	add    %bl,0xb(%ecx)
 192:	00 00                	add    %al,(%eax)
 194:	7b 00                	jnp    196 <evdev_fops+0x36>
 196:	00 00                	add    %al,(%eax)
 198:	23 09                	and    (%ecx),%ecx
	...
 1a2:	00 00                	add    %al,(%eax)
 1a4:	44                   	inc    %esp
	...
Disassembly of section .altinstructions:

00000000 <.altinstructions>:
   0:	6a 06                	push   $0x6
   2:	00 00                	add    %al,(%eax)
   4:	00 00                	add    %al,(%eax)
   6:	00 00                	add    %al,(%eax)
   8:	19 04 03             	sbb    %eax,(%ebx,%eax,1)
   b:	00 ef                	add    %ch,%bh
   d:	08 00                	or     %al,(%eax)
   f:	00 03                	add    %al,(%ebx)
  11:	00 00                	add    %al,(%eax)
  13:	00 19                	add    %bl,(%ecx)
  15:	04 03                	add    $0x3,%al
Disassembly of section .rodata.str1.1:

00000000 <.rodata.str1.1>:
   0:	3c 33                	cmp    $0x33,%al
   2:	3e                   	ds
   3:	65                   	gs
   4:	76 64                	jbe    6a <evdev_free+0x2>
   6:	65                   	gs
   7:	76 3a                	jbe    43 <__mod_description740+0x3>
   9:	20 6e 6f             	and    %ch,0x6f(%esi)
   c:	20 6d 6f             	and    %ch,0x6f(%ebp)
   f:	72 65                	jb     76 <__mod_license741+0xa>
  11:	20 66 72             	and    %ah,0x72(%esi)
  14:	65 65 20 65 76       	and    %ah,%gs:0x76(%ebp)
  19:	64                   	fs
  1a:	65                   	gs
  1b:	76 20                	jbe    3d <evdev_poll+0x3d>
  1d:	64                   	fs
  1e:	65                   	gs
  1f:	76 69                	jbe    8a <__mod_vermagic5+0xa>
  21:	63 65 73             	arpl   %sp,0x73(%ebp)
  24:	0a 00                	or     (%eax),%al
  26:	65                   	gs
  27:	76 65                	jbe    8e <__mod_vermagic5+0xe>
  29:	6e                   	outsb  %ds:(%esi),(%dx)
  2a:	74 25                	je     51 <evdev_fasync+0xd>
  2c:	64 00 65 76          	add    %ah,%fs:0x76(%ebp)
  30:	64                   	fs
  31:	65                   	gs
  32:	76 00                	jbe    34 <evdev_poll+0x34>
Disassembly of section .modinfo:

00000000 <__mod_author739>:
   0:	61                   	popa   
   1:	75 74                	jne    77 <__mod_license741+0xb>
   3:	68 6f 72 3d 56       	push   $0x563d726f
   8:	6f                   	outsl  %ds:(%esi),(%dx)
   9:	6a 74                	push   $0x74
   b:	65 63 68 20          	arpl   %bp,%gs:0x20(%eax)
   f:	50                   	push   %eax
  10:	61                   	popa   
  11:	76 6c                	jbe    7f <__mod_license741+0x13>
  13:	69 6b 20 3c 76 6f 6a 	imul   $0x6a6f763c,0x20(%ebx),%ebp
  1a:	74 65                	je     81 <__mod_vermagic5+0x1>
  1c:	63 68 40             	arpl   %bp,0x40(%eax)
  1f:	75 63                	jne    84 <__mod_vermagic5+0x4>
  21:	77 2e                	ja     51 <__mod_description740+0x11>
  23:	63 7a 3e             	arpl   %di,0x3e(%edx)
	...

00000040 <__mod_description740>:
  40:	64                   	fs
  41:	65                   	gs
  42:	73 63                	jae    a7 <__mod_vermagic5+0x27>
  44:	72 69                	jb     af <__mod_vermagic5+0x2f>
  46:	70 74                	jo     bc <__module_depends+0x4>
  48:	69 6f 6e 3d 49 6e 70 	imul   $0x706e493d,0x6e(%edi),%ebp
  4f:	75 74                	jne    c5 <__module_depends+0xd>
  51:	20 64 72 69          	and    %ah,0x69(%edx,%esi,2)
  55:	76 65                	jbe    bc <__module_depends+0x4>
  57:	72 20                	jb     79 <__mod_license741+0xd>
  59:	65                   	gs
  5a:	76 65                	jbe    c1 <__module_depends+0x9>
  5c:	6e                   	outsb  %ds:(%esi),(%dx)
  5d:	74 20                	je     7f <__mod_license741+0x13>
  5f:	63 68 61             	arpl   %bp,0x61(%eax)
  62:	72 20                	jb     84 <__mod_vermagic5+0x4>
  64:	64                   	fs
  65:	65                   	gs
  66:	76 69                	jbe    d1 <__module_depends+0x19>
  68:	63 65 73             	arpl   %sp,0x73(%ebp)
	...

0000006c <__mod_license741>:
  6c:	6c                   	insb   (%dx),%es:(%edi)
  6d:	69 63 65 6e 73 65 3d 	imul   $0x3d65736e,0x65(%ebx),%esp
  74:	47                   	inc    %edi
  75:	50                   	push   %eax
  76:	4c                   	dec    %esp
	...

00000080 <__mod_vermagic5>:
  80:	76 65                	jbe    e7 <__mod_alias22+0x7>
  82:	72 6d                	jb     f1 <__mod_alias22+0x11>
  84:	61                   	popa   
  85:	67 69 63 3d 32 2e 36 	addr16 imul $0x2e362e32,61(%bp,%di),%esp
  8c:	2e 
  8d:	32 32                	xor    (%edx),%dh
  8f:	2d 31 2d 6d 65       	sub    $0x656d2d31,%eax
  94:	70 69                	jo     ff <__mod_alias22+0x1f>
  96:	73 2d                	jae    c5 <__module_depends+0xd>
  98:	73 6d                	jae    107 <__mod_alias22+0x27>
  9a:	70 20                	jo     bc <__module_depends+0x4>
  9c:	53                   	push   %ebx
  9d:	4d                   	dec    %ebp
  9e:	50                   	push   %eax
  9f:	20 70 72             	and    %dh,0x72(%eax)
  a2:	65                   	gs
  a3:	65                   	gs
  a4:	6d                   	insl   (%dx),%es:(%edi)
  a5:	70 74                	jo     11b <evdev_ioctl+0x15>
  a7:	20 6d 6f             	and    %ch,0x6f(%ebp)
  aa:	64                   	fs
  ab:	5f                   	pop    %edi
  ac:	75 6e                	jne    11c <evdev_ioctl+0x16>
  ae:	6c                   	insb   (%dx),%es:(%edi)
  af:	6f                   	outsl  %ds:(%esi),(%dx)
  b0:	61                   	popa   
  b1:	64 20 36             	and    %dh,%fs:(%esi)
  b4:	38 36                	cmp    %dh,(%esi)
  b6:	20 00                	and    %al,(%eax)

000000b8 <__module_depends>:
  b8:	64                   	fs
  b9:	65                   	gs
  ba:	70 65                	jo     121 <evdev_ioctl+0x1b>
  bc:	6e                   	outsb  %ds:(%esi),(%dx)
  bd:	64                   	fs
  be:	73 3d                	jae    fd <__mod_alias22+0x1d>
	...

000000e0 <__mod_alias22>:
  e0:	61                   	popa   
  e1:	6c                   	insb   (%dx),%es:(%edi)
  e2:	69 61 73 3d 69 6e 70 	imul   $0x706e693d,0x73(%ecx),%esp
  e9:	75 74                	jne    15f <evdev_ioctl+0x59>
  eb:	3a 62 2a             	cmp    0x2a(%edx),%ah
  ee:	76 2a                	jbe    11a <evdev_ioctl+0x14>
  f0:	70 2a                	jo     11c <evdev_ioctl+0x16>
  f2:	65 2a 2d 65 2a 6b 2a 	sub    %gs:0x2a6b2a65,%ch
  f9:	72 2a                	jb     125 <evdev_ioctl+0x1f>
  fb:	61                   	popa   
  fc:	2a 6d 2a             	sub    0x2a(%ebp),%ch
  ff:	6c                   	insb   (%dx),%es:(%edi)
 100:	2a 73 2a             	sub    0x2a(%ebx),%dh
 103:	66                   	data16
 104:	2a 77 2a             	sub    0x2a(%edi),%dh
	...
Disassembly of section .data:

00000000 <evdev_handler>:
   0:	00 00                	add    %al,(%eax)
   2:	00 00                	add    %al,(%eax)
   4:	f4                   	hlt    
   5:	07                   	pop    %es
   6:	00 00                	add    %al,(%eax)
   8:	a2 06 00 00 f1       	mov    %al,0xf1000006
   d:	05 00 00 00 00       	add    $0x0,%eax
  12:	00 00                	add    %al,(%eax)
  14:	60                   	pusha  
  15:	01 00                	add    %eax,(%eax)
  17:	00 40 00             	add    %al,0x0(%eax)
  1a:	00 00                	add    %al,(%eax)
  1c:	2e 00 00             	add    %al,%cs:(%eax)
  1f:	00 60 00             	add    %ah,0x0(%eax)
	...
Disassembly of section .gnu.linkonce.this_module:

00000000 <__this_module>:
	...
   c:	65                   	gs
   d:	76 64                	jbe    73 <__this_module+0x73>
   f:	65                   	gs
  10:	76 00                	jbe    12 <__this_module+0x12>
	...
Disassembly of section .bss:

00000000 <evdev_table>:
	...
Disassembly of section .comment:

00000000 <.comment>:
   0:	00 47 43             	add    %al,0x43(%edi)
   3:	43                   	inc    %ebx
   4:	3a 20                	cmp    (%eax),%ah
   6:	28 47 4e             	sub    %al,0x4e(%edi)
   9:	55                   	push   %ebp
   a:	29 20                	sub    %esp,(%eax)
   c:	34 2e                	xor    $0x2e,%al
   e:	31 2e                	xor    %ebp,(%esi)
  10:	32 20                	xor    (%eax),%ah
  12:	32 30                	xor    (%eax),%dh
  14:	30 36                	xor    %dh,(%esi)
  16:	31 31                	xor    %esi,(%ecx)
  18:	31 35 20 28 70 72    	xor    %esi,0x72702820
  1e:	65                   	gs
  1f:	72 65                	jb     86 <__mod_vermagic5+0x6>
  21:	6c                   	insb   (%dx),%es:(%edi)
  22:	65                   	gs
  23:	61                   	popa   
  24:	73 65                	jae    8b <__mod_vermagic5+0xb>
  26:	29 20                	sub    %esp,(%eax)
  28:	28 44 65 62          	sub    %al,0x62(%ebp)
  2c:	69 61 6e 20 34 2e 31 	imul   $0x312e3420,0x6e(%ecx),%esp
  33:	2e 31 2d 32 31 29 00 	xor    %ebp,%cs:0x293132
  3a:	00 47 43             	add    %al,0x43(%edi)
  3d:	43                   	inc    %ebx
  3e:	3a 20                	cmp    (%eax),%ah
  40:	28 47 4e             	sub    %al,0x4e(%edi)
  43:	55                   	push   %ebp
  44:	29 20                	sub    %esp,(%eax)
  46:	34 2e                	xor    $0x2e,%al
  48:	31 2e                	xor    %ebp,(%esi)
  4a:	32 20                	xor    (%eax),%ah
  4c:	32 30                	xor    (%eax),%dh
  4e:	30 36                	xor    %dh,(%esi)
  50:	31 31                	xor    %esi,(%ecx)
  52:	31 35 20 28 70 72    	xor    %esi,0x72702820
  58:	65                   	gs
  59:	72 65                	jb     c0 <__module_depends+0x8>
  5b:	6c                   	insb   (%dx),%es:(%edi)
  5c:	65                   	gs
  5d:	61                   	popa   
  5e:	73 65                	jae    c5 <__module_depends+0xd>
  60:	29 20                	sub    %esp,(%eax)
  62:	28 44 65 62          	sub    %al,0x62(%ebp)
  66:	69 61 6e 20 34 2e 31 	imul   $0x312e3420,0x6e(%ecx),%esp
  6d:	2e 31 2d 32 31 29 00 	xor    %ebp,%cs:0x293132

Re: PROBLEM: USB keyboards works only 4 per PC host port

[juanslayton]

Thanks for the clarification.

John

Re: PROBLEM: USB keyboards works only 4 per PC host port

[juanslayton]

I have to apologize for my limited knowledge, but mere ignorance never yet
kept a teacher quiet.  I am trying to follow this discussion because
Aivils and I are  basically trying to do the same thing.  In my case I am
presently running 20 keyboards on a 2.6.26 kernel, using an EHCI
controller, and they all work fine.

If I understand your analysis, Aivils' problem is because the UHCI
controllers are too slow.  (I just happened to get lucky with another
controller.)  I am left with two questions.

1.  What if Aivils needs more than 16 keyboards?  (Standard class sizes
here in California run from 20 to about 30.)  Is there any way he can do
this without a faster controller?

2.  What does the bandwidth limitation say about the maximum number of
boards with the EHCI controller?  I modified the kernel evdev.c and
input.c files to raise the maximum events from 32 to 64, but I hadn't
figured in the effects of bandwidth.

> Now if you plugged some of these keyboards into different UHCI
> controllers on the computer, then the problem wouldn't arise.  Each of
> your four UHCI controllers has two ports.  So without using any hubs at
> all, you can plug 8 keyboards into the computer and they will all work.
>
> If you use some extra hubs as well then you can plug four keyboards
> into each controller, allowing you to use 16 keyboards total.
>
> Alan Stern
>
>
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>

Re: PROBLEM: USB keyboards works only 4 per PC host port

[Alan Stern]

On Tue, 19 Aug 2008 juanslayton@dslextreme.com wrote:

> I have to apologize for my limited knowledge, but mere ignorance never yet
> kept a teacher quiet.  I am trying to follow this discussion because
> Aivils and I are  basically trying to do the same thing.  In my case I am
> presently running 20 keyboards on a 2.6.26 kernel, using an EHCI
> controller, and they all work fine.

You must be using some hubs.  The results you get will depend on the 
type of hub you use.

> If I understand your analysis, Aivils' problem is because the UHCI
> controllers are too slow.

Not just that; it also is a question of scheduling.  The uhci-hcd
driver isn't very clever about scheduling, and it tries to put all the
packets into the same frame.  If the packets were distributed among
multiple frames then the limit would be considerably higher (eight
times higher in this case).

I'm not sure of the scheduling details in the ohci-hcd driver; they
might well be more flexible than in uhci-hcd.  In which case a single
OHCI controller would be able to handle up to 32 of these keyboards, 
even though it is no faster than a UHCI controller.

>  (I just happened to get lucky with another
> controller.)  I am left with two questions.
> 
> 1.  What if Aivils needs more than 16 keyboards?  (Standard class sizes
> here in California run from 20 to about 30.)  Is there any way he can do
> this without a faster controller?

You should realize that Aivils _does_ have an EHCI controller.  He just
isn't using it, because his hubs are old.  So the easiest approach for 
him would be to buy USB-2.0 hubs.

If he doesn't want to do that there are a few ways, but they mostly
boil down to getting more controllers.  If he is good at kernel
programming, he could upgrade the scheduling algorithm in uhci-hcd --
but that will be a messy job and probably not worth the time spent
(which is why I've never done it).

> 2.  What does the bandwidth limitation say about the maximum number of
> boards with the EHCI controller?  I modified the kernel evdev.c and
> input.c files to raise the maximum events from 32 to 64, but I hadn't
> figured in the effects of bandwidth.

Like I said above, it depends on the type of hub you use.  If you have
hubs with multiple Transaction Translators then the bandwidth limit
will be very high.  I don't know how high exactly, but probably higher
than other limits, like the maximum number of USB devices on a single
bus (127).

If you have hubs with only a single Transaction Translator then the
limit will be lower, but still pretty high.  Certainly you would be
able to connect no more than four keyboards to each hub, but you could
have many hubs.  The details would depend on the scheduling algorithm 
in ehci-hcd, which I'm also not familiar with.

If you have only full-speed hubs (i.e., USB-1.1 hubs rather than
USB-2.0) then you won't be able to make use of the EHCI controller at
all.  That's the situation Aivils is in.

Alan Stern

Re: PROBLEM: USB keyboards works only 4 per PC host port

[David Brownell]

--- Alan Stern <stern@rowland.harvard.edu> wrote:

> On Tue, 19 Aug 2008 juanslayton@dslextreme.com wrote:
> > If I understand your analysis, Aivils' problem is because the UHCI
> > controllers are too slow.
> 
> Not just that; it also is a question of scheduling.  The uhci-hcd
> driver isn't very clever about scheduling, and it tries to put all the
> packets into the same frame.  If the packets were distributed among
> multiple frames then the limit would be considerably higher (eight
> times higher in this case).
> 
> I'm not sure of the scheduling details in the ohci-hcd driver; they
> might well be more flexible than in uhci-hcd.  In which case a single
> OHCI controller would be able to handle up to 32 of these keyboards, 
> even though it is no faster than a UHCI controller.

The OHCI scheduling is pretty simple and compact.  I'd think it would
be easy enough to make UHCI do the same sort of thing:  track bandwidth
assigned to 2^N frames (OHCI hardware imposes a smaller limit for N
than UHCI hardware does), and pick the least loaded of those frames to
use for new transfers.  In ohci-q.c see balance(), periodic_{,un}link().

Thing is that would involve changing how UHCI manages periodic transfers;
assuming it hasn't changed those structures since last I looked.

Re: PROBLEM: USB keyboards works only 4 per PC host port

[Alan Stern]

On Tue, 19 Aug 2008, David Brownell wrote:

> The OHCI scheduling is pretty simple and compact.  I'd think it would
> be easy enough to make UHCI do the same sort of thing:  track bandwidth
> assigned to 2^N frames (OHCI hardware imposes a smaller limit for N
> than UHCI hardware does), and pick the least loaded of those frames to
> use for new transfers.  In ohci-q.c see balance(), periodic_{,un}link().
> 
> Thing is that would involve changing how UHCI manages periodic transfers;
> assuming it hasn't changed those structures since last I looked.

Yes.  That's the messy part; the scheduling itself is easy.

Alan Stern

Re: PROBLEM: USB keyboards works only 4 per PC host port

[juanslayton]

Thanks for the clarification.

John

PROBLEM: USB keyboards works only 4 per PC host port

[Aivils Stoss]

Hello All!

PROBLEM: USB keyboards works only 4 per PC host port.

I work for project which will use 15 - 25 keyboards for children teaching.
I discover current Linux 2.6.22 , 2.6.24, 2.6.26 dot not support more
than 4 keyboards per single PC host port. All plugged in keyboards
are listed as USB devices, listed as input devices, but capable to
send input events are only 4 keyboards, no matter where keyboards
are plugged in to HUB cascade. All plugged in keyboards switch LED's,
when i press NumLock.

I tested various usb-hub units and various host PC hardware, i even
replace hub power supplay units from 5V1A to 5V3A. All tested cases
give best results - 4 keyboards per PC host port and worstest - some PC
cannot do more than 8 keyboards at all.
I suppose this is Linux kernel bug because i test keyboards under
Windows, which support any schema of cascading of usb hubs.

I will send any log file if that is necessary, but trouble will pop up
in a row of kernels. 2.6.22 didn't have error messages. 2.6.24, 2.6.26
tend to total slow down with eternal reset messages:
Jul 25 07:16:00 awork kernel: input,hiddev97: USB HID v1.10 Mouse 
[USB-compliant keyboard] on usb-0000:00:1d.0-1.1.2
Jul 25 07:16:01 awork kernel: usb 2-1.1.1: reset low speed USB device using 
uhci_hcd and address 17
Jul 25 07:16:01 awork kernel: usb 2-1.1.2: reset low speed USB device using 
uhci_hcd and address 18
Jul 25 07:16:02 awork kernel: usb 2-1.1.1: reset low speed USB device using 
uhci_hcd and address 17
Jul 25 07:16:03 awork kernel: usb 2-1.1.2: reset low speed USB device using 
uhci_hcd and address 18
Jul 25 07:16:04 awork kernel: usb 2-1.1.1: reset low speed USB device using 
uhci_hcd and address 17
Jul 25 07:16:05 awork kernel: usb 2-1.1.2: reset low speed USB device using 
uhci_hcd and address 18


Best regards,
Aivils Stoss