Re: [REGRESSION] ThinkPad L15 Gen 4 touchpad no longer works

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On 03.11.24 09:24, Ulrich Müller wrote:
> After upgrading from 6.6.52 to 6.6.58, tapping on the touchpad stopped
> working. The problem is still present in 6.6.59.
> 
> I see the following in dmesg output; the first line was not there
> previously:
> 
> [    2.129282] hid-multitouch 0018:27C6:01E0.0001: The byte is not expected for fixing the report descriptor. It's possible that the touchpad firmware is not suitable for applying the fix. got: 9
> [    2.137479] input: GXTP5140:00 27C6:01E0 as /devices/platform/AMDI0010:00/i2c-0/i2c-GXTP5140:00/0018:27C6:01E0.0001/input/input10
> [    2.137680] input: GXTP5140:00 27C6:01E0 as /devices/platform/AMDI0010:00/i2c-0/i2c-GXTP5140:00/0018:27C6:01E0.0001/input/input11
> [    2.137921] hid-multitouch 0018:27C6:01E0.0001: input,hidraw0: I2C HID v1.00 Mouse [GXTP5140:00 27C6:01E0] on i2c-GXTP5140:00
> 
> Hardware is a Lenovo ThinkPad L15 Gen 4.
> 
> The problem goes away when reverting this commit:
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/drivers/hid/hid-multitouch.c?id=251efae73bd46b097deec4f9986d926813aed744

Thx for the report. Is this a 6.6.y specific thing, or does it happen
with 6.12-rc6 or later as well?  And if it does: does the revert fix it
there, too?

Ciao, Thorsten (wearing his 'the Linux kernel's regression tracker' hat)
--
Everything you wanna know about Linux kernel regression tracking:
https://linux-regtracking.leemhuis.info/about/#tldr
If I did something stupid, please tell me, as explained on that page.




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