Public bug reported:

This may be related to bug #1903858 “Synaptics Touchpad not working
dynabook TECRA A40-G”.

Release: Kubuntu 20.10 freshly out of the box.  (The same problem
observed with live versions of Ubuntu 20.04.)

xserver-xorg-input-libinput:
  Installed: 0.30.0-1
  Candidate: 0.30.0-1
  Version table:
 *** 0.30.0-1 500
        500 http://gb.archive.ubuntu.com/ubuntu groovy/main amd64 Packages
        100 /var/lib/dpkg/status

Problem:

Touchpad _almost_ does not work at all. The cursor moves a little from
time to time, and reacts to buttons from time to time, in an
indeterminate manner.  There is no problem under Windows – touchpad
works perfectly well there.

Not sure this problem is specific to libinput.  Tried replacing it with
synaptics (as described here:
https://askubuntu.com/questions/1088559/ubuntu-18-04-switch-back-to-
synaptics-as-input-driver) and the problem persisted.

Attaching various files suggested by
https://wiki.ubuntu.com/DebuggingTouchpadDetection.

** Affects: xserver-xorg-input-libinput (Ubuntu)
     Importance: Undecided
         Status: New

** Attachment added: "xev.log"
   https://bugs.launchpad.net/bugs/1907991/+attachment/5443262/+files/xev.log

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https://bugs.launchpad.net/bugs/1907991

Title:
  Touchpad not working dynabook PORTEGE-X30L-G-10J

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