I've discovered some useful info about this bug. First, there's a forum
thread about it with lots of good info: https://ubuntu-
mate.community/t/20-04-display-issues-with-amd-gpu/21648/37
Second, a new workaround. To recap, the first workaround I found was
booting with nomodeset, but that disables
Today I had some more time to play around with my computer so I tried
testing your hypothesis. I rebooted into my current software
configuration with no workarounds as a control, and reproduced the bug
as expected. Then I downgraded my system to the Marco version from 19.10
(1.22.3) by downloading
Now this is where it gets weird. Since I have Ubuntu MATE, I installed
the ubuntu-desktop package to get the default GNOME environment. I kept
my display manager as LightDM in case that's relevant.
Then I rebooted and tested all 3 desktop modes with default kernel
options. As expected, MATE is sti
A quick update. I tested to see if kernel version affects this bug, and
it appears not to. I booted up the previous installed kernel on my
system (5.3.0-55) without the default options and got the exact same
issue. Likewise, using the old kernel with nomodeset eliminates the
corruption at the expen
Public bug reported:
Today I upgraded from Ubuntu MATE 19.10 to 20.04. After doing so, Ubuntu boots
normally to the display manager (login screen) as expected. But once I log in,
everything on the screen is cut up into horizontal slices, with each slice
offset farther right than the slice above
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