Comment # 53
on bug 106175
from bmilreu@gmail.com
(In reply to rropid from comment #45) > (In reply to bmilreu from comment #43) > > 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. > > I just tried dc=1 and I only seem to have a problem if I use TearFree. > Things are totally fine without TearFree. > > To be clear about what I'm doing here right now: > > I made sure DC is enabled: > > $ systool -vm amdgpu | grep dc > dc = "1" > $ dmesg | grep -i display > [ 1.014297] [drm] Display Core initialized with v3.1.59! > > I removed TearFree from my X config: > > $ cat /etc/X11/xorg.conf.d/20-amdgpu.conf > Section "OutputClass" > Identifier "my amdgpu settings" > MatchDriver "amdgpu" > Option "DRI" "3" > EndSection > > And I started Compton like this to make sure it's a clean config: > > $ compton --config /dev/null --backend glx --vsync opengl > > With this setup, I don't seem to have any stutter. I visited the websites > you mention in a Chromium window, then opened another window and tried > moving things around and resizing. It behaves fine, same as what I know from > normally using dc=0. > > Kernel is 4.19.2, Mesa 18.2.4, Xorg 1.20.3, the GPU is a RX480, monitor is > 60 Hz. > > After I had typed this, I have now added TearFree to the X config and > restarted X: > > $ cat /etc/X11/xorg.conf.d/20-amdgpu.conf > Section "OutputClass" > Identifier "my amdgpu settings" > MatchDriver "amdgpu" > Option "TearFree" "true" > Option "DRI" "3" > EndSection > > Now, with TearFree enabled, things are super terrible. Trying to move a > window around has extreme stutter, it seems to drop frames. If I restart > Compton with "GALLIUM_HUD=fps" and then try moving a window around in > circles, I can see it stays below 40 fps instead of hitting the 60 fps that > it should be running at. "compton --vsync opengl" is a case less/not affected by this in my setup, try --vsync opengl-swc, --vsync opengl-oml or --vsync opengl-mswc Also try other compositors. Kwin, mutter, xfwm4
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