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

[Launchpad Bug Tracker]

This bug was fixed in the package xserver-xorg-video-amdgpu - 22.0.0-3

---------------
xserver-xorg-video-amdgpu (22.0.0-3) unstable; urgency=medium

  * Added patch from git to fix slow refresh rate with AMD GPU Screen
    output in reverse prime mode. (LP: #1987038)

 -- Kai-Heng Feng <kai.heng.feng at canonical.com>  Fri, 19 Aug 2022
13:16:55 +0800

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

-- 
You received this bug notification because you are a member of Ubuntu
Sponsors Team, which is subscribed to the bug report.
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 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.

To manage notifications about this bug go to:
https://bugs.launchpad.net/hwe-next/+bug/1987038/+subscriptions