I wanted to hold off until I was sure, but I've confirmed this was a
(second) hardware problem. Dell replaced my laptop's touchpad a second
time yesterday, and after deleting the device in Windows 10 and
refreshing, the OS detected the new touchpad fine. I reinstalled Ubuntu
yesterday and it's also working fine, with scrolling etc. functioning as
normal.
So basically, Dell gave me a laptop with a "broken hardware" touchpad
and improbably replaced it with a "bad firmware" touchpad. I appreciate
all the help with this issue, and I'll mark this bug resolved, and
update the other bugs.
Some takeaways:
1. Try other kernels / distros.
2. Try Windows (if available). Dual-boot would have been super handy in this
case, even if the Windows installation is for break-glass emergencies.
3. Dell only replaces broken hardware with the same model as the original, so
inconsistent hardware detection probably means bad hardware.
** Changed in: linux (Ubuntu)
Assignee: (unassigned) => Ed Holden (edholden)
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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 the model (nicknamed
"wobble") 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, 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.
---
ProblemType: Bug
ApportVersion: 2.20.11-0ubuntu27.16
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: edholden 1571 F.... pulseaudio
CasperMD5CheckResult: skip
CurrentDesktop: KDE
DistroRelease: Ubuntu 20.04
InstallationDate: Installed on 2020-10-11 (183 days ago)
InstallationMedia: Ubuntu 20.04.1 LTS "Focal Fossa" - Release amd64 (20200731)
MachineType: Dell Inc. XPS 15 9500
NonfreeKernelModules: nvidia_modeset nvidia
Package: linux (not installed)
ProcFB: 0 i915drmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.8.0-48-generic
root=UUID=a8be5c03-8499-4474-932d-725877e9cc6c ro quiet splash vt.handoff=7
ProcVersionSignature: Ubuntu 5.8.0-48.54~20.04.1-generic 5.8.18
RelatedPackageVersions:
linux-restricted-modules-5.8.0-48-generic N/A
linux-backports-modules-5.8.0-48-generic N/A
linux-firmware 1.187.10
Tags: focal
Uname: Linux 5.8.0-48-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin lxd plugdev sambashare sudo
_MarkForUpload: True
dmi.bios.date: 12/24/2020
dmi.bios.release: 1.6
dmi.bios.vendor: Dell Inc.
dmi.bios.version: 1.6.1
dmi.board.name: 0RDX6T
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 10
dmi.chassis.vendor: Dell Inc.
dmi.modalias:
dmi:bvnDellInc.:bvr1.6.1:bd12/24/2020:br1.6:svnDellInc.:pnXPS159500:pvr:rvnDellInc.:rn0RDX6T:rvrA00:cvnDellInc.:ct10:cvr:
dmi.product.family: XPS
dmi.product.name: XPS 15 9500
dmi.product.sku: 097D
dmi.sys.vendor: Dell Inc.
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