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Bug#924913: trackpad on L480 unusable after upgrade to testing

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On Mon, Mar 18, 2019 at 12:43:10PM +0100, Alois Schlögl wrote:
> On 3/18/19 12:20 PM, Romain Perier wrote:
> > Hello,
> >
> > On Mon, Mar 18, 2019 at 11:27:41AM +0100, Alois Schlögl wrote:
> >> Source: linux
> >> Severity: normal
> >>
> >> Dear Maintainer,
> >>
> >>    On a Lenovo L480 laptop, I've upgraded Debian from 9 (stretch) to 10
> >> (testing).
> >>    After the upgrade, the touchpad and the trackpoint was not usable
> >> anymore.
> >>
> >>
> >>    This already has some bug report here,
> >>    https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1803600
> >>
> >>    As a workaround, one can run the command,
> >>        sudo sh -c 'echo -n "elantech">
> >> /sys/bus/serio/devices/serio1/protocol'
> >>    in order to use the touchpad. However, on a GUI Interface and without
> >>    an external mouse, it's impossible to apply this workaround
> >>   (switching to the terminal <CTRL>-<ALT>F1, login, and run the command
> >> above might work)
> >>
> >>    I expect to be able to use the touchpad just out of the box, not needing
> >>    to run the above workaround
> >>
> > Could you :
> >
> > - Test with the last kernel uploaded to unstable (4.19.0-4:4.19.28) and confirm or
> >   not is the problem still exists ?
> 
> 
> Dear Romain
> 
> 
> I upgraded the kernel and rebooted:
> 
> schloegl@debian10:~$ uname -a
> Linux debian10 4.19.0-4-amd64 #1 SMP Debian 4.19.28-2 (2019-03-15)
> x86_64 GNU/Linux
> 
> 
> With this kernel the trackpoint is working, the trackpad is still not
> usable.
> 
> (This improves the situation because now at least one pointer device is
> available).
> 
>

Good, we did some progress :)

> > - According to the bug on launchpad and to the fix pushed upstream, the
> >   fix seems to be an hardware quirks, could you give me the output of the
> >   following command :
> >   $ /sys/bus/serio/devices/serio1/firmware_id
> 
> 
> root@debian10:~# cat /sys/bus/serio/devices/serio1/firmware_id
> PNP: LEN2036 PNP0f13
> 

Could you test the patch attached to this reply ?
(if you don't know how to do this, I can provide support)

Regards,
Romain

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Bug#924913: trackpad on L480 unusable after upgrade to testing Alois Schlögl <alois.schloegl@ist.ac.at> - 2019-03-18 11:40 +0100
  Bug#924913: trackpad on L480 unusable after upgrade to testing Romain Perier <romain.perier@gmail.com> - 2019-03-18 12:30 +0100
    Bug#924913: trackpad on L480 unusable after upgrade to testing Alois Schlögl <alois.schloegl@ist.ac.at> - 2019-03-18 13:00 +0100
      Bug#924913: trackpad on L480 unusable after upgrade to testing Romain Perier <romain.perier@gmail.com> - 2019-03-18 20:00 +0100
        Bug#924913: trackpad on L480 unusable after upgrade to testing Alois Schlögl <alois.schloegl@ist.ac.at> - 2019-03-20 08:40 +0100
          Bug#924913: trackpad on L480 unusable after upgrade to testing Romain Perier <romain.perier@gmail.com> - 2019-03-26 21:10 +0100
            Bug#924913: trackpad on L480 unusable after upgrade to testing Romain Perier <romain.perier@gmail.com> - 2019-03-29 17:20 +0100
            Bug#924913: trackpad on L480 unusable after upgrade to testing Alois Schlögl <alois.schloegl@ist.ac.at> - 2019-05-29 18:10 +0200
              Bug#924913: trackpad on L480 unusable after upgrade to testing Romain Perier <romain.perier@gmail.com> - 2019-05-31 21:30 +0200
  Bug#924913: BIOS update helped Damien Miller <djm@djm.net.au> - 2019-07-22 10:10 +0200

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