Thinkpad X1 Tablet Gen3 trackpoint and touchpad buttons not working with 5.3.0-51

[paoletto]

As per summary, after dist-upgrading a 18.04LTS on the device, the trackpoint and touchpad buttons stopped working.
Booting back with 5.3.0-40 has them working.
Fix this regression pls (and also add support for the microphone)

Update: Just tested 20.04LTS live, and i can reproduce the regression.
For me, the last working kernel is 5.3.0-40.

[Ubuntu Foundations Team Bug Bot (crichton)]

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[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

This bug is missing log files that will aid in diagnosing the problem. While running an Ubuntu kernel (not a mainline or third-party kernel) please enter the following command in a terminal window:

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[jiha (jiha-ubuone)]

For me (on 19.10)
kernel 5.3.0-40-generic is the last good version.
kernel 5.3.0-53-generic is the first bad version.

support for trackpoint / multi-touch landed with kernel 5.x in ubuntu.
See also https://www.spinics.net/lists/linux-input/msg60060.html

[Kai-Heng Feng (kaihengfeng)]

Would it be possible for you to do a kernel bisection?

First, find the last -rc kernel works and the first -rc kernel doesn’t work from http://kernel.ubuntu.com/~kernel-ppa/mainline/

Then,
$ sudo apt build-dep linux
$ git clone git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
$ cd linux
$ git bisect start
$ git bisect good $(the working version you found)
$ git bisect bad $(the non-working version found)
$ make localmodconfig
$ make -j`nproc` deb-pkg
Install the newly built kernel, then reboot with it.
If it still have the same issue,
$ git bisect bad
Otherwise,
$ git bisect good
Repeat to "make -j`nproc` deb-pkg" until you find the offending commit.

[jiha (jiha-ubuone)]

see also Kernel.org Bugzilla – Bug 206271
https://bugzilla.kernel.org/show_bug.cgi?id=206271

patches and further info:
https://github.com/Lunm0us/linux-tp1gen3

[jiha (jiha-ubuone)]

Also just read:
https://github.com/Lunm0us/linux-tp1gen3/issues/2

According to that the commit which broke it:
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=v5.4.18&id=4091fbf6cc143c8ccd8275eaa642b2f2afe7c4ab