Thanks for all that. It appears the problematic monitor is:
VGA-1 connected 1200x1920+0+0 left (normal left inverted right x axis y axis)
519mm x 324mm
1920x1200 59.95*+
My first suspicion is that "VGA" is the first problem there. The
overdrawing of letters/pixels suggests a signal or mode problem that you
would probably only encounter with an analog connection like VGA. So
this could be a hardware/cable problem, or even a kernel driver problem.
Not sure.
** Summary changed:
- Ubuntu display is corrupted, never recovers
+ Rotated display is overscaled and overdrawn
** Changed in: gnome-shell (Ubuntu)
Status: Incomplete => New
** Also affects: mutter (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1830792
Title:
[i915] Rotated display is overscaled and overdrawn
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