Turns out this is a kernel panic described here:

https://www.mail-archive.com/ubuntu-
[email protected]/msg5949850.html

to do with the Elantech driver. In that thread Chris Chiu states "It
should be caused by the kbuild flag `-fcf-protection=none` and this will
not be applied for the UBUNTU release image."

I tried the kernel he compiled, presumably without that flag:
https://people.canonical.com/~mschiu77/lp1941773/I/

and it works.

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https://bugs.launchpad.net/bugs/1945531

Title:
  screen freezes at boot

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