[Bug 106175] amdgpu.dc=1 shows performance issues with Xorg compositors when moving windows

https://bugs.freedesktop.org/show_bug.cgi?id=106175

--- Comment #98 from Michel Dänzer michel@daenzer.net --- (In reply to Brandon Wright from comment #95)

For me, at least, it hiccups regularly every second and introduces noticeable latency. With dc=1 it's smooth

Thanks, I was able to reproduce the hiccups with vsynctester.com in windowed Firefox.

and more responsive.

Couldn't see a difference there (looking at how much the red dot trails the mouse cursor on vsynctester.com). Ironically, the problem is actually that non-DC can be too responsive, sometimes completing page flips in the same vertical blank period.

https://gitlab.freedesktop.org/xorg/driver/xf86-video-amdgpu/merge_requests/... fixes it for me.