This bug was fixed in the package xserver-xorg-video-amdgpu -
19.1.0-1ubuntu0.1
---------------
xserver-xorg-video-amdgpu (19.1.0-1ubuntu0.1) focal; 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.f...@canonical.com> Wed, 24 Aug 2022
15:42:19 +0800
** Changed in: xserver-xorg-video-amdgpu (Ubuntu Focal)
Status: Fix Committed => Fix Released
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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 Released
Status in xserver-xorg-video-amdgpu source package in Jammy:
Fix Released
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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