Bug 206271

Summary:	Trackpoint stops working after updating from Kernel 5.4.11 to 5.4.12
Product:	Drivers	Reporter:	Johannes Goepfert (goepfert.johannes)
Component:	USB	Assignee:	Default virtual assignee for Drivers/USB (drivers_usb)
Status:	NEW ---
Severity:	normal	CC:	bernd.sontheimer
Priority:	P1
Hardware:	x86-64
OS:	Linux
Kernel Version:	5.4.13	Subsystem:
Regression:	Yes	Bisected commit-id:

Description Johannes Goepfert 2020-01-21 20:15:51 UTC

The Trackpoint from my Lenovo X1 Tablet Gen 3 stopped working after updating to Kernel version 5.4.12. The Trackpoint is recognized by "usbmon" (usbmon gives an output) and also "libinput list-devices". But there is no output for "cat /dev/input/eventX".

Comment 1 Bernd Sontheimer 2020-02-23 10:34:04 UTC

(In reply to Johannes Goepfert from comment #0)
> The Trackpoint from my Lenovo X1 Tablet Gen 3 stopped working after updating
> to Kernel version 5.4.12. The Trackpoint is recognized by "usbmon" (usbmon
> gives an output) and also "libinput list-devices". But there is no output
> for "cat /dev/input/eventX".

I can confirm the issue for this specific tablet. Further, there are patches and a dkms module here https://github.com/Lunm0us/linux-tp1gen3 that fix the trackpoint and also enable missing function keys like FnLock.