I enabled focal-proposed and upgrade xserver-xorg-video-amdgpu. Made sure Wayland was not selected in GDM as Xorg is the default, then connected an external monitor which routes to AMDGPU instead of Intel. Close the lid to make the external monitor the single display, the refresh rate is smooth so the issue is resolved.
I also boot up an AMD APU laptop to test the package and no regression was found.
Basically the same as Jammy.
I enabled focal-proposed and upgrade xserver- xorg-video- amdgpu. Made sure Wayland was not selected in GDM as Xorg is the default, then connected an external monitor which routes to AMDGPU instead of Intel. Close the lid to make the external monitor the single display, the refresh rate is smooth so the issue is resolved.
I also boot up an AMD APU laptop to test the package and no regression was found.