* Scanner/webcam not working when connected to USB hub
@ 2005-12-05 13:19 Hervé Fache
2005-12-06 21:14 ` Greg KH
0 siblings, 1 reply; 3+ messages in thread
From: Hervé Fache @ 2005-12-05 13:19 UTC (permalink / raw)
To: linux-kernel
Hello guys,
I have the following problem: if connected directly to my computer's
USB ports, my webcam works correctly, but when connected through my
'AirVast' hub (124a:168b), it fails. The device is reported by lsusb
(IDs correct), but it does not work. The worst is: I have tried using
some proprietary OS, and it all worked there.
There are two possibilities (did I miss one?) I guess: either libusb
is playing, or the kernel USB stack is.
Now, rather than giving work to others, I don't mind trying to find
the problem myself, but I would appreciate a pointer to how to debug
such a problem... Tools? Compilation options?
Cheers,
Hervé.
Kernel: 2.6.12 from Kubuntu
Hub Descriptor:
bLength 9
bDescriptorType 41
nNbrPorts 3
wHubCharacteristic 0x0002
No power switching (usb 1.0)
Ganged overcurrent protection
bPwrOn2PwrGood 1 * 2 milli seconds
bHubContrCurrent 0 milli Ampere
DeviceRemovable 0xf0
PortPwrCtrlMask 0x37
Hub Port Status:
Port 1: 0000.0103 power enable connect
Port 2: 0000.0100 power
Port 3: 0000.0103 power enable connect
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: Scanner/webcam not working when connected to USB hub
2005-12-05 13:19 Scanner/webcam not working when connected to USB hub Hervé Fache
@ 2005-12-06 21:14 ` Greg KH
2005-12-07 0:41 ` Re : " Hervé Fache
0 siblings, 1 reply; 3+ messages in thread
From: Greg KH @ 2005-12-06 21:14 UTC (permalink / raw)
To: herve; +Cc: linux-kernel
On Mon, Dec 05, 2005 at 11:19:05AM -0200, Herv? Fache wrote:
> Hello guys,
>
> I have the following problem: if connected directly to my computer's
> USB ports, my webcam works correctly, but when connected through my
> 'AirVast' hub (124a:168b), it fails. The device is reported by lsusb
> (IDs correct), but it does not work. The worst is: I have tried using
> some proprietary OS, and it all worked there.
Is it a USB 1.1 device connected to a USB 2.0 hub? If so, Linux
currently has some issues with running properly for this setup. See the
linux-usb-devel mailing list archives for some patches that some people
have found to resolve this.
thanks,
greg k-h
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re : Scanner/webcam not working when connected to USB hub
2005-12-06 21:14 ` Greg KH
@ 2005-12-07 0:41 ` Hervé Fache
0 siblings, 0 replies; 3+ messages in thread
From: Hervé Fache @ 2005-12-07 0:41 UTC (permalink / raw)
To: Greg KH; +Cc: linux-kernel
Sorry I missed this important point in my message. You're right. I
shall check the mailing lists you supplied and report success there if
any.
Cheers,
Hervé.
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2005-12-07 0:41 UTC | newest]
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2005-12-05 13:19 Scanner/webcam not working when connected to USB hub Hervé Fache
2005-12-06 21:14 ` Greg KH
2005-12-07 0:41 ` Re : " Hervé Fache
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