Lenovo T480s touchpad and buttons randomly fail

[Kai Hendry]

Updated Archlinux user here.
Through 4.18.9-arch1-1-ARCH to 4.18.14-arch1-1-ARCH

Some times when I boot, my touch pad doesn't work at all. Or it might work and suddenly stop working. Unreproducible.

Any ideas?

https://s.natalian.org/2018-09-24/touchpad.txt

Workaround is using the external USB mouse. Which wouldn't be so bad if my USB port on the left didn't work. Could it simply be a hardware issue?


Many thanks!

[Peter Hutterer]

Post by Kai Hendry
Updated Archlinux user here.
Through 4.18.9-arch1-1-ARCH to 4.18.14-arch1-1-ARCH
Some times when I boot, my touch pad doesn't work at all. Or it might work
and suddenly stop working. Unreproducible.

has it ever worked before? This page here has the list of things needed:
https://wayland.freedesktop.org/libinput/doc/latest/reporting-bugs.html
but see below, it appears to be a kernel (hw?) bug.

Post by Kai Hendry
Any ideas?
https://s.natalian.org/2018-09-24/touchpad.txt

there's no touchpad in that list which usually has only one of two reasons:
- the kernel doesn't detect it (likely)
- the udev setup is broken and ID_INPUT + ID_INPUT_TOUCHPAD isn't assigned
(unlikely unless you manually messed with udev rules)

right now, my bet is on a kernel bug.

Post by Kai Hendry
http://youtu.be/PVPmcg0oxrY

can you sum this up please? making everyone watch a youtube video is likely
to reduce the number of people who can reply with suggestions.

Post by Kai Hendry
Workaround is using the external USB mouse. Which wouldn't be so bad if my
USB port on the left didn't work. Could it simply be a hardware issue?

probably a bios issue, google for it. there's some weird issues with them
being working for some devices but not others depending on the charge option
in the bios (depends on the model number, but my T440s here has similar
issues with some devices only working on a specific port).

Cheers,
Peter