Public bug reported: 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. ** Affects: ubuntu Importance: Undecided Status: New ** Attachment added: "/proc/bus/input/devices" https://bugs.launchpad.net/bugs/1923515/+attachment/5487018/+files/devices -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1923515 Title: [Dell XPS 15 9500] New touchpad detected as "PS/2 Logitech Wheel Mouse" To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+bug/1923515/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
