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

[bugzilla-daemon at freedesktop.org]

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

--- Comment #43 from bmilreu at gmail.com ---
(In reply to Brandon Wright from comment #42)
> This is pretty serious. Just moving the mouse cursor around while something
> slightly GPU-heavy is running at 60hz can produce frame-skipping.
> 
> I switched the display core off with amdgpu.dc=0 and everything got
> significantly smoother and chromium doesn't chug on heavy pages any more.
> 
> I'm using 4.19.x. I haven't tried the drm-next-4.21-wip tree yet.
Dont need to try drm-next-4.21-wip, just did and it still has the issue

If devs want an easy test case, use these links for reproducing it in chromium:

https://www.vsynctester.com/
https://www.testufo.com/photo
https://www.slither.io

move the cursor around, move/resize some windows. you will notice it

the vsync/cursor stutters and frame-skips are pretty noticeable with dc=1 on
all three links

KWin, compton, TearFree, mutter, xfwm4 all have the same problems.

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