Public bug reported:
[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
** Also affects: xserver-xorg-video-amdgpu (Ubuntu Kinetic)
Importance: Undecided
Status: New
** Also affects: xserver-xorg-video-amdgpu (Ubuntu Jammy)
Importance: Undecided
Status: New
** Changed in: xserver-xorg-video-amdgpu (Ubuntu Jammy)
Status: New => Confirmed
** Changed in: xserver-xorg-video-amdgpu (Ubuntu Kinetic)
Status: New => Confirmed
** Changed in: xserver-xorg-video-amdgpu (Ubuntu Kinetic)
Importance: Undecided => Medium
** Changed in: xserver-xorg-video-amdgpu (Ubuntu Jammy)
Importance: Undecided => Medium
--
You received this bug notification because you are a member of Desktop
Packages, which is subscribed to xserver-xorg-video-amdgpu in Ubuntu.
https://bugs.launchpad.net/bugs/1987038
Title:
Fix slow refresh rate when AMD GPU screen in reverse prime mode
Status in xserver-xorg-video-amdgpu package in Ubuntu:
Confirmed
Status in xserver-xorg-video-amdgpu source package in Jammy:
Confirmed
Status in xserver-xorg-video-amdgpu source package in Kinetic:
Confirmed
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/ubuntu/+source/xserver-xorg-video-amdgpu/+bug/1987038/+subscriptions
--
Mailing list: https://launchpad.net/~desktop-packages
Post to : desktop-packages@lists.launchpad.net
Unsubscribe : https://launchpad.net/~desktop-packages
More help : https://help.launchpad.net/ListHelp
