Yes, I've been working on installing Windows, and also speaking with
Dell, whose support techs say a replacement touchpad should have been
the exact same model as the original (except not with a hardware
defect). I wanted to make sure they'd support the laptop, which came
with Windows, as well as see what device Windows detects.

Interestingly, Windows 10 has basically the same issue as Linux! I sees
a device called "I2C HID device" that has problems, and in that device's
status are the messages "The device cannot start (Code 10)" and "A
request for the HID descriptor failed." There's also a pointing device
called "PS/2 compatible Mouse" that is ... definitely not a PS/2 mouse.

So, I think Windows agrees with Linux and this might not be a kernel
issue after all. No amount of Dell Windows driver updates or Windows
updates resolves it, and a Dell tech spent a long time remote
controlling and testing with me. It looks like Dell replaced a piece of
bad touchpad hardware that had good firmware, with a piece of good
touchpad hardware that had bad firmware. I'm getting a *second*
replacement touchpad in about a week.

I can update this bug after the new one is installed and confirmed
working, and I reinstall Linux.

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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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