OK it sounds like Mutter is calculating an incorrect display timing.
I'm surprised the list of refresh rates is shorter because historically
Xorg has had more.
** No longer affects: linux (Ubuntu)
** Changed in: mutter (Ubuntu)
Status: Incomplete => New
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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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