I also wonder if Xorg itself is trying to apply sanity checking and
ignoring the top mode thinking it can't be true:
Modeline "Mode 1" 580.08 2560 2608 2640 2720 1440 1443
1448 1481 +hsync -vsync
** Also affects: xorg-server (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1834761
Title:
[amdgpu] monitor refresh rates higher than 120 Hz not detected/cannot
be set
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