That's a good point. We might be able to rule out mutter... Can you
please run this command in Plasma desktop:
xrandr --verbose > plasmaxrandr.txt
and attach the resulting file here?
** Changed in: mutter (Ubuntu)
Status: New => Incomplete
** Changed in: gnome-control-center (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1907870
Title:
HDMI monitor detected but black screen (has a preferred mode but no
current mode) with Intel UHD graphics on kernel 5.9
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