Public bug reported:
[Impact]
When AMD GPU is a GPU screen using reverse prime and its the only display, the
fresh rate is very slow.
[Fix]
Enable present extension for GPU screen so it can be a viable CRTC to be
selected.
[Test]
On a I+A laptop and external displays are routed to AMDGPU, disable internal
display like closing lid can observe the issue.
With the fix applied, the external display becomes very smooth.
[Where problems could occur]
I personally don't see why GPU screen can't use present extension, but this is
Xorg so there might be some arcane reasons I didn't think of.
** Affects: xserver-xorg-video-amdgpu (Ubuntu)
Importance: Medium
Status: Confirmed
** Affects: xserver-xorg-video-amdgpu (Ubuntu Jammy)
Importance: Medium
Status: Confirmed
** Affects: xserver-xorg-video-amdgpu (Ubuntu Kinetic)
Importance: Medium
Status: Confirmed
** Also affects: xserver-xorg-video-amdgpu (Ubuntu Kinetic)
Importance: Undecided
Status: New
** Also affects: xserver-xorg-video-amdgpu (Ubuntu Jammy)
Importance: Undecided
Status: New
** Changed in: xserver-xorg-video-amdgpu (Ubuntu Jammy)
Status: New => Confirmed
** Changed in: xserver-xorg-video-amdgpu (Ubuntu Kinetic)
Status: New => Confirmed
** Changed in: xserver-xorg-video-amdgpu (Ubuntu Kinetic)
Importance: Undecided => Medium
** Changed in: xserver-xorg-video-amdgpu (Ubuntu Jammy)
Importance: Undecided => Medium
--
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which is subscribed to xserver-xorg-video-amdgpu in Ubuntu.
https://bugs.launchpad.net/bugs/1987038
Title:
Fix slow refresh rate when AMD GPU screen in reverse prime mode
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