Created attachment 145309 [details] video_with_bug Hello. During using Chromium on wayland I faced with an issue - huge white/black squads flickering over the screen, in case if I opened video into full-screen mode. OS: Manjaro Linux den-pc 5.2.11-1-MANJARO Xorg-server 1.20.5-2 (Xwayland and all related packs the same version) Chromium (chromium) 76.0.3809.132-1 (tested and on downgraded version) Mesa versions - git-master, 19.1.5 (system) etc... Steps: 1. Login into wayland session 2. Launch chromium 3. Open chromium into full-screen mode (it is important, because in other way bug can't be reproduced) 4. Launch any youtube video 5. Open video in a full-screen mode Result: picture starts flickering with white-black squads. Video attached. I searched for same/similar issues and could find only these, quite old and resolved mostly: https://bugs.freedesktop.org/show_bug.cgi?id=106841 https://bugs.chromium.org/p/chromium/issues/detail?id=849682 https://bugs.freedesktop.org/show_bug.cgi?id=111140 Second thing - is that running with "--disable-gpu-driver-bug-workarounds" - resolves issue. Bisection lead me to: 069fdd5f9facbd72fb6a289696c7b74e3237e70f is the first bad commit commit 069fdd5f9facbd72fb6a289696c7b74e3237e70f Author: Louis-Francis Ratté-Boulianne <lfrb@collabora.com> Date: Fri Jul 7 02:54:26 2017 -0400 egl/x11: Support DRI3 v1.1 Issue doesn't exist on Xorg session. Possibly (as in found tickets) it may be related to regression in Xwayland, but I am not sure in this.
That is usually a desynchronization between the compositor and the client (chromium) of state of the compression of the surface. One is rendering compressed, the other reading uncompressed. We recently pointed mutter/gnome-shell to avoid reading the texture of a shared surface from the CPU (glReadPixels, etc...) because it would trigger that. We should probably fix the driver, but this is somewhat of a rewrite of how we deal with aux surfaces.
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