Touchpad is erratic on thinkpad T14 AMD Gen2

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1

As the title suggests, I have been having issues with an erratic touchpad input. The cursor jumps around erratically now and then. The trackpoint however is fine.

I have experienced the issue on the fedora kernel as well as a the latest vanilla 5.16 kernel on Fedora 35.

I am able to reload the psmouse module on the vanilla kernel as I built the mouse as a modular driver in the kernel config. However, this only temporarily fixes the issue as the problem reappears within 10-15 minutes.

Does anyone have any suggestions?

2

Hi, would you like to post the result sudo libinput list-devices?

3

Hi, thank you for the reply! Please find the output below:

Device: Power Button
Kernel: /dev/input/event3
Group: 1
Seat: seat0, default
Capabilities: keyboard
Tap-to-click: n/a
Tap-and-drag: n/a
Tap drag lock: n/a
Left-handed: n/a
Nat.scrolling: n/a
Middle emulation: n/a
Calibration: n/a
Scroll methods: none
Click methods: none
Disable-w-typing: n/a
Accel profiles: n/a
Rotation: n/a

Device: Video Bus
Kernel: /dev/input/event5
Group: 2
Seat: seat0, default
Capabilities: keyboard
Tap-to-click: n/a
Tap-and-drag: n/a
Tap drag lock: n/a
Left-handed: n/a
Nat.scrolling: n/a
Middle emulation: n/a
Calibration: n/a
Scroll methods: none
Click methods: none
Disable-w-typing: n/a
Accel profiles: n/a
Rotation: n/a

Device: Power Button
Kernel: /dev/input/event0
Group: 3
Seat: seat0, default
Capabilities: keyboard
Tap-to-click: n/a
Tap-and-drag: n/a
Tap drag lock: n/a
Left-handed: n/a
Nat.scrolling: n/a
Middle emulation: n/a
Calibration: n/a
Scroll methods: none
Click methods: none
Disable-w-typing: n/a
Accel profiles: n/a
Rotation: n/a

Device: Lid Switch
Kernel: /dev/input/event1
Group: 4
Seat: seat0, default
Capabilities: switch
Tap-to-click: n/a
Tap-and-drag: n/a
Tap drag lock: n/a
Left-handed: n/a
Nat.scrolling: n/a
Middle emulation: n/a
Calibration: n/a
Scroll methods: none
Click methods: none
Disable-w-typing: n/a
Accel profiles: n/a
Rotation: n/a

Device: Sleep Button
Kernel: /dev/input/event2
Group: 5
Seat: seat0, default
Capabilities: keyboard
Tap-to-click: n/a
Tap-and-drag: n/a
Tap drag lock: n/a
Left-handed: n/a
Nat.scrolling: n/a
Middle emulation: n/a
Calibration: n/a
Scroll methods: none
Click methods: none
Disable-w-typing: n/a
Accel profiles: n/a
Rotation: n/a

Device: Integrated Camera: Integrated C
Kernel: /dev/input/event14
Group: 6
Seat: seat0, default
Capabilities: keyboard
Tap-to-click: n/a
Tap-and-drag: n/a
Tap drag lock: n/a
Left-handed: n/a
Nat.scrolling: n/a
Middle emulation: n/a
Calibration: n/a
Scroll methods: none
Click methods: none
Disable-w-typing: n/a
Accel profiles: n/a
Rotation: n/a

Device: Integrated Camera: Integrated I
Kernel: /dev/input/event15
Group: 6
Seat: seat0, default
Capabilities: keyboard
Tap-to-click: n/a
Tap-and-drag: n/a
Tap drag lock: n/a
Left-handed: n/a
Nat.scrolling: n/a
Middle emulation: n/a
Calibration: n/a
Scroll methods: none
Click methods: none
Disable-w-typing: n/a
Accel profiles: n/a
Rotation: n/a

Device: AT Translated Set 2 keyboard
Kernel: /dev/input/event4
Group: 7
Seat: seat0, default
Capabilities: keyboard
Tap-to-click: n/a
Tap-and-drag: n/a
Tap drag lock: n/a
Left-handed: n/a
Nat.scrolling: n/a
Middle emulation: n/a
Calibration: n/a
Scroll methods: none
Click methods: none
Disable-w-typing: n/a
Accel profiles: n/a
Rotation: n/a

Device: SynPS/2 Synaptics TouchPad
Kernel: /dev/input/event16
Group: 8
Seat: seat0, default
Size: 70x50mm
Capabilities: pointer gesture
Tap-to-click: disabled
Tap-and-drag: enabled
Tap drag lock: disabled
Left-handed: disabled
Nat.scrolling: disabled
Middle emulation: disabled
Calibration: n/a
Scroll methods: *two-finger edge
Click methods: *button-areas clickfinger
Disable-w-typing: enabled
Accel profiles: flat *adaptive
Rotation: n/a

Device: TPPS/2 Elan TrackPoint
Kernel: /dev/input/event17
Group: 9
Seat: seat0, default
Capabilities: pointer
Tap-to-click: n/a
Tap-and-drag: n/a
Tap drag lock: n/a
Left-handed: disabled
Nat.scrolling: disabled
Middle emulation: disabled
Calibration: n/a
Scroll methods: *button
Click methods: none
Disable-w-typing: n/a
Accel profiles: flat *adaptive
Rotation: n/a

Device: ThinkPad Extra Buttons
Kernel: /dev/input/event7
Group: 10
Seat: seat0, default
Capabilities: keyboard
Tap-to-click: n/a
Tap-and-drag: n/a
Tap drag lock: n/a
Left-handed: n/a
Nat.scrolling: n/a
Middle emulation: n/a
Calibration: n/a
Scroll methods: none
Click methods: none
Disable-w-typing: n/a
Accel profiles: n/a
Rotation: n/a

4

I’m not sure, but you could try to add kernel parameter i8042.nomux=1 with:

sudo grubby --args="i8042.nomux=1" --update-kernel=ALL

Then reboot and see if there any changes.

If above not works, you could remove it with:

sudo grubby --remove-args="i8042.nomux=1" --update-kernel=ALL

Btw, may be you also want to report it to bugzilla.redhat.com against libinput.

5

Hello! This works in nixos unstable as of 12/24/22 as well. Excellent fix! Thank you!