Re: Why does libinput randomly calls my touchpad "SynPS/2 Synaptics" or "Synaptics TM2722-001"?

Re: Why does libinput randomly calls my touchpad "SynPS/2 Synaptics" or "Synaptics TM2722-001"?

[Lyude Paul]

FWIW: You might have better luck asking on some of the linux-input
lists.... however

you got lucky because it happens I've both worked on this stack and
dealt with this exact machine haha. So I actually can answer this
(response down below):

On Tue, 2024-04-23 at 15:12 +0100, Ottavio Caruso wrote:
> Hi,
> 
> $ sudo X -version
> 
> X.Org X Server 1.21.1.7
> X Protocol Version 11, Revision 0
> Current Operating System: Linux t440 6.1.0-20-amd64 #1 SMP 
> PREEMPT_DYNAMIC Debian 6.1.85-1 (2024-04-11) x86_64
> Kernel command line: BOOT_IMAGE=/boot/vmlinuz-6.1.0-20-amd64 
> root=UUID=42a17f43-89bb-4523-952f-b8d97bcb4a30 ro quiet
> xorg-server 2:21.1.7-3+deb12u7 (https://www.debian.org/support)
> Current version of pixman: 0.42.2
> 
> $ xinput --version
> xinput version 1.6.3
> XI version on server: 2.4
> 
> 
> 
> On my old-ish Thinkpad T440, libinput alternatively calls my touchpad
> "SynPS/2 Synaptics" or "Synaptics TM2722-001".
> 
> $ grep Synaptics  /var/log/messages
> Nov 26 09:12:38 t440 kernel: [18070.908478] psmouse serio1:
> synaptics: 
> serio: Synaptics pass-through port at isa0060/serio1/input0
> Nov 26 09:12:38 t440 kernel: [18070.947812] input: SynPS/2 Synaptics 
> TouchPad as /devices/platform/i8042/serio1/input/input35
> Nov 26 20:33:19 t440 kernel: [27221.274488] rmi4_f01 rmi4-00.fn01:
> found 
> RMI device, manufacturer: Synaptics, product: TM2722-001, fw id: 0
> Nov 26 20:33:19 t440 kernel: [27221.314747] input: Synaptics TM2722-
> 001 
> as /devices/pci0000:00/0000:00:1f.3/i2c-0/0-002c/rmi4-
> 00/input/input39
> Nov 27 19:28:05 t440 kernel: [    6.327297] psmouse serio1:
> synaptics: 
> serio: Synaptics pass-through port at isa0060/serio1/input0
> Nov 27 19:28:05 t440 kernel: [    6.366655] input: SynPS/2 Synaptics 
> TouchPad as /devices/platform/i8042/serio1/input/input2
> 
> This without even rebooting or suspending the laptop.

I don't think this has anything to do with libinput - Synaptics
touchpads from around this generation will initially get setup as a
PS/2 device during boot. But PS/2 mode is very limited (and somewhat
buggy) functionality wise, so at the first opportunity the synaptics
kernel driver will query the touchpad to figure out if it can be
supported over RMI4. If so, the driver is supposed to switch the
touchpad to that mode and discard the PS/2 device. So - it sounds like
what's happening is that is broken for some reason.

FWIW: I added linux-input to this thread along with our synaptics
contact: Andrew Duggan.

> 
> I have some scripts that disable or enable the touchpad (especially
> when 
> I use the mouse) and I have to use tricks to accommodate this.
> 
> Why does this happen in the first place? How can I troubleshoot it?
> 
> Thanks.
> 

-- 
Cheers,
 Lyude Paul (she/her)
 Software Engineer at Red Hat

Re: Why does libinput randomly calls my touchpad "SynPS/2 Synaptics" or "Synaptics TM2722-001"?

[Ottavio Caruso]

Am Mi., 24. Apr. 2024 um 22:12 Uhr schrieb Lyude Paul <lyude@redhat.com>:
>
> FWIW: You might have better luck asking on some of the linux-input
> lists.... however
>
> you got lucky because it happens I've both worked on this stack and
> dealt with this exact machine haha. So I actually can answer this
> (response down below):


It turns out I didn't get any replies from anyone.

>
> On Tue, 2024-04-23 at 15:12 +0100, Ottavio Caruso wrote:
> > Hi,
> >
> > $ sudo X -version
> >
> > X.Org X Server 1.21.1.7
> > X Protocol Version 11, Revision 0
> > Current Operating System: Linux t440 6.1.0-20-amd64 #1 SMP
> > PREEMPT_DYNAMIC Debian 6.1.85-1 (2024-04-11) x86_64
> > Kernel command line: BOOT_IMAGE=/boot/vmlinuz-6.1.0-20-amd64
> > root=UUID=42a17f43-89bb-4523-952f-b8d97bcb4a30 ro quiet
> > xorg-server 2:21.1.7-3+deb12u7 (https://www.debian.org/support)
> > Current version of pixman: 0.42.2
> >
> > $ xinput --version
> > xinput version 1.6.3
> > XI version on server: 2.4
> >
> >
> >
> > On my old-ish Thinkpad T440, libinput alternatively calls my touchpad
> > "SynPS/2 Synaptics" or "Synaptics TM2722-001".
> >
> > $ grep Synaptics  /var/log/messages
> > Nov 26 09:12:38 t440 kernel: [18070.908478] psmouse serio1:
> > synaptics:
> > serio: Synaptics pass-through port at isa0060/serio1/input0
> > Nov 26 09:12:38 t440 kernel: [18070.947812] input: SynPS/2 Synaptics
> > TouchPad as /devices/platform/i8042/serio1/input/input35
> > Nov 26 20:33:19 t440 kernel: [27221.274488] rmi4_f01 rmi4-00.fn01:
> > found
> > RMI device, manufacturer: Synaptics, product: TM2722-001, fw id: 0
> > Nov 26 20:33:19 t440 kernel: [27221.314747] input: Synaptics TM2722-
> > 001
> > as /devices/pci0000:00/0000:00:1f.3/i2c-0/0-002c/rmi4-
> > 00/input/input39
> > Nov 27 19:28:05 t440 kernel: [    6.327297] psmouse serio1:
> > synaptics:
> > serio: Synaptics pass-through port at isa0060/serio1/input0
> > Nov 27 19:28:05 t440 kernel: [    6.366655] input: SynPS/2 Synaptics
> > TouchPad as /devices/platform/i8042/serio1/input/input2
> >
> > This without even rebooting or suspending the laptop.
>
> I don't think this has anything to do with libinput - Synaptics
> touchpads from around this generation will initially get setup as a
> PS/2 device during boot. But PS/2 mode is very limited (and somewhat
> buggy) functionality wise, so at the first opportunity the synaptics
> kernel driver will query the touchpad to figure out if it can be
> supported over RMI4. If so, the driver is supposed to switch the
> touchpad to that mode and discard the PS/2 device. So - it sounds like
> what's happening is that is broken for some reason.
>
> FWIW: I added linux-input to this thread along with our synaptics
> contact: Andrew Duggan.
>
> >
> > I have some scripts that disable or enable the touchpad (especially
> > when
> > I use the mouse) and I have to use tricks to accommodate this.
> >
> > Why does this happen in the first place? How can I troubleshoot it?
> >
> > Thanks.
> >
>
> --
> Cheers,
>  Lyude Paul (she/her)
>  Software Engineer at Red Hat
>


-- 
Ottavio Caruso

A: Because it messes up the order in which people normally read text.
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A: Top-posting.
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