According to your XorgLog.txt it looks like the choice of 75Hz is coming
from the AMDGPU driver:
[ 97.816] (II) AMDGPU(0): Modeline "3840x1600"x75.0 566.25 3840
4016 4104 4400 1600 1607 1617 1716 +hsync -vsync (128.7 kHz eP)
However the AMDGPU driver is also confused by the monitor's aspect
ratio, which might be the problem:
[ 97.816] (WW) AMDGPU(0): Output HDMI-A-0: Strange aspect ratio (879/366),
consider adding a quirk
[ 97.816] (WW) AMDGPU(0): Output HDMI-A-0: Strange aspect ratio (879/366),
consider adding a quirk
[ 97.816] (WW) AMDGPU(0): Output HDMI-A-0: Strange aspect ratio (879/366),
consider adding a quirk
Does the same monitor work when plugged into an Intel or Nvidia GPU?
** Package changed: xorg (Ubuntu) => xorg-server (Ubuntu)
** Summary changed:
- Screen flickering on ultra wide
+ [amdgpu + nvidia PCI passthrough] Screen flickering on ultra wide
** Tags added: amdgpu nvidia radeon
** Also affects: xserver-xorg-video-amdgpu (Ubuntu)
Importance: Undecided
Status: New
** Changed in: xorg-server (Ubuntu)
Status: New => Incomplete
** Changed in: xserver-xorg-video-amdgpu (Ubuntu)
Status: New => Incomplete
--
You received this bug notification because you are a member of Ubuntu-X,
which is subscribed to xorg-server in Ubuntu.
https://bugs.launchpad.net/bugs/1811863
Title:
[amdgpu + nvidia PCI passthrough] Screen flickering on ultra wide
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/1811863/+subscriptions
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