Interestingly, logging in and out again makes the trackpad work, no
reboot needed.
$ dpkg -l | grep xorg
ii python3-xkit 0.5.0ubuntu4
all library for the
manipulation of xorg.conf files (Python 3)
ii xorg
1:7.7+19ubuntu14 amd64 X.Org
X Window System
ii xorg-docs-core 1:1.7.1-1.1
all Core documentation for
the X.org X Window System
ii xorg-sgml-doctools 1:1.11-1
all Common tools for
building X.Org SGML documentation
ii xserver-xorg
1:7.7+19ubuntu14 amd64 X.Org
X server
ii xserver-xorg-core
2:1.20.8-2ubuntu2 amd64 Xorg X
server - core server
ii xserver-xorg-input-all
1:7.7+19ubuntu14 amd64 X.Org
X server -- input driver metapackage
ii xserver-xorg-input-libinput 0.29.0-1
amd64 X.Org X server --
libinput input driver
ii xserver-xorg-input-synaptics 1.9.1-1ubuntu3
amd64 Synaptics TouchPad
driver for X.Org server
ii xserver-xorg-input-wacom
1:0.39.0-0ubuntu1 amd64 X.Org
X server -- Wacom input driver
ii xserver-xorg-legacy
2:1.20.8-2ubuntu2 amd64 setuid
root Xorg server wrapper
ii xserver-xorg-video-intel
2:2.99.917+git20200226-1 amd64 X.Org
X server -- Intel i8xx, i9xx display driver
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https://bugs.launchpad.net/bugs/1876863
Title:
touchpad stops generating mouse motion after a while (focal, lenovo
yoga c930)
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https://bugs.launchpad.net/ubuntu/+bug/1876863/+subscriptions
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