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

[Kai-Heng Feng]

debdiff for Focal.

** Patch added: "xserver-xorg-video-amdgpu_19.1.0-1ubuntu0.1.debdiff"
   https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-amdgpu/+bug/1987038/+attachment/5611345/+files/xserver-xorg-video-amdgpu_19.1.0-1ubuntu0.1.debdiff

** Also affects: xserver-xorg-video-amdgpu (Ubuntu Focal)
   Importance: Undecided
       Status: New

** Changed in: xserver-xorg-video-amdgpu (Ubuntu Focal)
       Status: New => Confirmed

** Changed in: xserver-xorg-video-amdgpu (Ubuntu Focal)
   Importance: Undecided => Medium

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https://bugs.launchpad.net/bugs/1987038

Title:
  Fix slow refresh rate when AMD GPU screen in reverse prime mode

Status in HWE Next:
  New
Status in xserver-xorg-video-amdgpu package in Ubuntu:
  Fix Released
Status in xserver-xorg-video-amdgpu source package in Focal:
  Confirmed
Status in xserver-xorg-video-amdgpu source package in Jammy:
  Confirmed
Status in xserver-xorg-video-amdgpu source package in Kinetic:
  Fix Released

Bug description:
  [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.

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