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Touchpad not detected by kernel on ThinkPad X13 Gen5

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Hi,

I recently bought a ThinkPad X13 Gen5 (benefiting from the discount
generously offered by Lenovo to Debian Developers).

The laptop runs Debian Bookworm, and I got almost all the hardware to
work by using more recent kernel and firmware files (see Debian bug
reports #1070647, #1070648, #1070650).

However, I still can’t get the touchpad to work. It is apparently not
recognized by the kernel, since the touchpad does not appear in
/proc/bus/input/devices, and there is nothing in the kernel log. Note
that the computer runs a custom build of Linux kernel 6.9.1.

I opened a bug report against the kernel:
https://bugzilla.kernel.org/show_bug.cgi?id=218868

I’m largely ignorant of everything related to input drivers, so ideally
I would need help to further debug this and provide more useful
information to the kernel developers.

Thanks,

-- 
⢀⣴⠾⠻⢶⣦⠀  Sébastien Villemot
⣾⠁⢠⠒⠀⣿⡁  Debian Developer
⢿⡄⠘⠷⠚⠋⠀  https://sebastien.villemot.name
⠈⠳⣄⠀⠀⠀⠀  https://www.debian.org

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Touchpad not detected by kernel on ThinkPad X13 Gen5 Sébastien Villemot <sebastien@debian.org> - 2024-05-27 19:40 +0200
  Re: Touchpad not detected by kernel on ThinkPad X13 Gen5 David <bouncingcats@gmail.com> - 2024-05-28 15:20 +0200
  Re: Touchpad not detected by kernel on ThinkPad X13 Gen5 Sébastien Villemot <sebastien@debian.org> - 2024-05-29 15:40 +0200

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