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

[Łukasz Zemczak]

Hello Kai-Heng, or anyone else affected,

Accepted xserver-xorg-video-amdgpu into focal-proposed. The package will
build now and be available at
https://launchpad.net/ubuntu/+source/xserver-xorg-video-
amdgpu/19.1.0-1ubuntu0.1 in a few hours, and then in the -proposed
repository.

Please help us by testing this new package.  See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how
to enable and use -proposed.  Your feedback will aid us getting this
update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested, what testing has been
performed on the package and change the tag from verification-needed-
focal to verification-done-focal. If it does not fix the bug for you,
please add a comment stating that, and change the tag to verification-
failed-focal. In either case, without details of your testing we will
not be able to proceed.

Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification .  Thank you in
advance for helping!

N.B. The updated package will be released to -updates after the bug(s)
fixed by this package have been verified and the package has been in
-proposed for a minimum of 7 days.

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

** Tags removed: verification-done
** Tags added: verification-needed verification-needed-focal

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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:
  Fix Released
Status in xserver-xorg-video-amdgpu package in Ubuntu:
  Fix Released
Status in xserver-xorg-video-amdgpu source package in Focal:
  Fix Committed
Status in xserver-xorg-video-amdgpu source package in Jammy:
  Fix Committed
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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