Have the same problem as Will with my T480 on kernel 5.4.0-80-generic
(Ubuntu 20.04.2 LTS).

One can bring it back for a couple of minutes with the following:
sudo rmmod -f psmouse
sudo modprobe -v psmouse resync_time=5 resetafter=5

Also have a look at
xinput --list
to see if it both devices (synaptics and trackpoint) came back.

However, the same dmesg error pops up after some minutes...

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https://bugs.launchpad.net/bugs/787738

Title:
  [Thinkpad X220/E220s/E420s] trackpoint/trackpoint displays odd
  behaviour

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