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How to diagnose/fix touchpad not working (but working on a live CD)?

jo flag

On my Lenovo Yoga 7 Gen 7, the touchpad suddenly stopped working. I may have inadvertly changed some configuration and/or un/installed related packages, and I'm trying to figure out how to fix it.

When I boot from a live CD, the touchpad works fine.

However, when I start the system regularly, it doesn't work at all; xinput list doesn't report it:

⎡ Virtual core pointer                      id=2    [master pointer  (3)]
⎜   ↳ Virtual core XTEST pointer                id=4    [slave  pointer  (2)]
⎜   ↳ Wacom HID 52D3 Finger                     id=12   [slave  pointer  (2)]
⎣ Virtual core keyboard                     id=3    [master keyboard (2)]
[...]

This is the list of installed packages that may be related:

$ aptitude search ~ilibinput ~itouchpad ~isynap
i A libinput-bin
i A libinput10
i A xserver-xorg-input-libinput

How do I diagnose and fix this? Installing the xserver-xorg-input-synaptics package didn't help.

I sit in a Tesla and translated this thread with Ai:

mangohost

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