After validating that I didn't seem to get issues with 20.04.2 I fully
replaced 20.04.3 with the previous version.

I can edit the grub config, but would that impact a live disk? If yes, I
can try editing grub, loading into the .2 version on a live disk, and
play around until I see an issue.

Also worth pointing out that I will sometimes see no graphics issues for
a while, and other times see graphics issues constantly (which is also
in line with the screen connection hypothesis). It's possible the same
is true for 20.04.3 -- I may just not have seen the graphical
irregularities appear yet.

Let me know about the grub config.

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https://bugs.launchpad.net/bugs/1950355

Title:
  Intense screen flickering, vertical rainbow bars, display problems on
  Ubuntu 20.04, Lenovo X1 Carbon

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