[Bug 1987038] [NEW] Fix slow refresh rate when AMD GPU screen in reverse prime mode

[Launchpad Bug Tracker]

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[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


** Tags: patch
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Fix slow refresh rate when AMD GPU screen in reverse prime mode
https://bugs.launchpad.net/bugs/1987038
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