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** Changed in: linux (Ubuntu)
Status: New => Incomplete
** Tags added: groovy
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https://bugs.launchpad.net/bugs/1923515
Title:
[Dell XPS 15 9500] New touchpad detected as "PS/2 Logitech Wheel
Mouse"
Status in linux package in Ubuntu:
Incomplete
Bug description:
I've been using Ubuntu 20.04 on a Dell XPS 15 9550. The laptop's
touchpad had a hardware defect common to this model, so Dell sent a
tech to replace it. The new touchpad looks identical to the original
but the kernel doesn't correctly detect it. The device does work, but
appears to the kernel as a "PS/2 Logitech Wheel Mouse," which prevents
the use of features like two-finger scrolling (though the device does
work), disabling tap to click, and palm detection.
A good summary of my troubleshooting steps are here:
https://askubuntu.com/questions/1330555/touchpad-detected-as-ps-2-logitech-wheel-mouse-dell-xps-15-ubuntu-20-04
Importantly, I've tried a mainline kernel downloaded from Ubuntu
(5.11.12 and a 5.12.0 release candidate, whereas the current version
is a 5.8.0). I've also tried two bootable USB drives containing Ubuntu
20.04 and 21.04 (release candidate). Nothing has changed the device
detection or behavior. The issue is identical in the default Ubuntu
desktop and in Plasma. There are no touchpad settings in the UEFI
BIOS.
Per the touchpad detection instructions, I've attached the output of
/proc/bus/input/devices, Xorg.0.log, and the `xinput --list` command.
My suspicion is that Dell has ordered a brand new touchpad model for
which there is no kernel driver; looking at the logs, the previous
model was an elantech, but I'm not sure if the new one is as well.
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