https://bugs.freedesktop.org/show_bug.cgi?id=106175
Bug ID: 106175 Summary: amdgpu.dc=1 shows performance issues with Xorg compositors when moving windows Product: DRI Version: unspecified Hardware: x86-64 (AMD64) OS: Linux (All) Status: NEW Severity: normal Priority: medium Component: DRM/AMDgpu Assignee: dri-devel@lists.freedesktop.org Reporter: tempel.julian@gmail.com
Created attachment 138987 --> https://bugs.freedesktop.org/attachment.cgi?id=138987&action=edit dmesg
When amdgpu.dc=1 and an Xorg compositor are enabled at the same time, there is stuttering when moving windows. It's most visible with Compton (which is completely stutter-free when amdgpu.dc=0), but also KWin and to a lesser extent also Gnome-Mutter. It happens also with GPU clocks forced to maximum, so it doesn't seem to be a powersaving issue. In the recent past, there was an issue with performance degrading when amdgpu.dc=1 and an Xorg compositor are enabled and the hardware mouse cursor was used, maybe it's still related (just guessing though)?
Tested with Linux 4.17 RC1 and drm-next-4.18-wip (4.16.1.52132fd03) xorg-server 1.19.6+13+gd0d1a694f (amdgpu DDX & modesetting) RX 560