Regression in Elan Touchpad driver / Linux 5.12

Hello,

since migrating to Linux 5.12, the Elan touchpad stopped working for me. I created a bug report on
https://bugzilla.kernel.org/show_bug.cgi?id=213093
2but I am not sure whether that reached anyone here.

The symptom is that when running 5.12, the touchpad does not show up.

I tested so far with 5.12.3, 5.12.4 and 5.12.6, all behave the same, latest dmesg output on 5.12.6 does not show the touchpad driver loading, only the one for the trackpoint:

[13:35] nb3:~% dmesg| grep -i elan

[   11.845386] psmouse serio1: trackpoint: Elan TrackPoint firmware: 0x62, buttons: 3/3
[   11.857853] input: TPPS/2 Elan TrackPoint as /devices/platform/i8042/serio1/input/input23

[13:35] nb3:~%

The hardware I am using is an Lenovo X1 nano, however other people also reported this problem before.

If there is anything I can do to debug this, any pointer would be appreciated.

Best regards,

Nico

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Sustainable and modern Infrastructures by ungleich.ch

Hi,

Do you have i2c-hid-acpi module enabled?

Thanks.

Dmitry

I just rebuild 5.12.6 with i2c-hid-acpi and it works again. Thanks a lot for the pointer. I also notified the Alpine Linux team to include in kernels >= 5.12.

Thanks again and have a good evening!

Nico

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Sustainable and modern Infrastructures by ungleich.ch