Bug 942797

Summary:	sys-kernel/gentoo-sources-6.6.58-r1: ThinkPad L15 Gen 4 touchpad no longer works
Product:	Gentoo Linux	Reporter:	Ulrich Müller <ulm>
Component:	Current packages	Assignee:	Gentoo Kernel Bug Wranglers and Kernel Maintainers <kernel>
Status:	RESOLVED FIXED
Severity:	normal	Keywords:	InVCS
Priority:	Normal
Version:	unspecified
Hardware:	All
OS:	Linux
URL:	https://lore.kernel.org/stable/uikt4wwpw@gentoo.org/
Whiteboard:
Package list:		Runtime testing required:	---
Attachments:	Patch that fixes the problem here

Description Ulrich Müller gentoo-dev

2024-11-03 01:46:49 UTC

Tapping on the touchpad stopped working in gentoo-sources-6.6.58-r1.

I see the following in dmesg output; the first line was not there in previous kernel versions:

[    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 Lenovo ThinkPad L15 Gen 4:
https://linux-hardware.org/?probe=1b28fd0c04

The problem did not occur with the previous stable version 6.6.52.

Comment 1 Ulrich Müller gentoo-dev

2024-11-03 01:50:18 UTC

Created attachment 907741 [details, diff]
Patch that fixes the problem here

Reverting this hunk from 1056_linux-6.6.57.patch fixes (or works around?) the problem here.

Comment 2 Ulrich Müller gentoo-dev

2024-11-03 08:08:44 UTC

Upstream commit that introduced the problem is here:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/drivers/hid/hid-multitouch.c?id=251efae73bd46b097deec4f9986d926813aed744

Comment 3 Mike Pagano gentoo-dev

2024-11-20 19:42:57 UTC

Released in kernels carrying genpatches in versions >= 6.1.116, >= .6.6.60 and >= 6.11.7

Comment 4 Ulrich Müller gentoo-dev

2025-02-04 07:09:28 UTC

The problem is fixed in the following upstream kernel versions:

   6.1.128
   6.6.75
   6.12.12
   6.13.1
   6.14-rc1