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"
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