I would need to see the monitor's EDID data to be sure which are modes
supported by the hardware vs modes made up in software. Please try:
sudo apt install edid-decode
for e in /sys/class/drm/*/edid ; do edid-decode $e ; done > edids.txt
and attach the resulting text file here.
** Changed in: linux (Ubuntu)
Status: New => Incomplete
** Changed in: mutter (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/2074559
Title:
[nouveau][Samsung SyncMaster] Top margin of secondary monitor covered
with black flickering rectangle
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