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