SUMMARY I can't reproduce this bug consistently, sometimes it occurs after the steps below. STEPS TO REPRODUCE 1. use Wayland session 2. play a video with VLC player running on Xwayland 3. minimize and then unminimize VLC by quickly clicking on its entry in task manager OBSERVED RESULT Sometimes VLC window stops repainting and apparently the video is paused. If this bug did not occur after the steps above, repeat the step 3. Probably at some point the bug will occur. The already open bugged window repaints again if I apply another Lattency setting in Compositor KCM. EXPECTED RESULT the bug reported here should not occur SOFTWARE/OS VERSIONS Operating System: Arch Linux KDE Plasma Version: 5.22.90 KDE Frameworks Version: 5.86.0 Qt Version: 5.15.2 Graphics Platform: Wayland ADDITIONAL INFORMATION Other affected Xwayland apps: Discord, Opera internet browser and Strawberry player (Qt6). This bug also occurs on neon unstable.
Can't reproduce after a dozen of attempts.
I was able to reproduce consistently on neon unstable a few minutes ago with the steps below after running Opera browser for ~5 hours. Then I restarted Opera and now I'm no longer able to reproduce. 1. run Opera in a virtual desktop 2. while Opera window is focused and maximized, switch to another virtual desktop by clicking on Pager widget placed on Plasma panel 3. switch back to virtual desktop where Opera is 4. minimize and then unminimize Opera by clicking on its entry in task manager Reult: Opera window stopped repainting. When I clicked on any tab, the label of Opera entry in task manager changed according to, but nothing changed in Opera window. Again changing Latency setting in Compositor KCM fixed the bug temporarily. Operating System: KDE neon Unstable Edition KDE Plasma Version: 5.23.80 KDE Frameworks Version: 5.86.0 Qt Version: 5.15.3 Graphics Platform: Wayland
> Opera window stopped repainting Was it frozen or invisible?
(In reply to Vlad Zahorodnii from comment #3) > > Opera window stopped repainting > Was it frozen or invisible? Almost always frozen. I got an invisible window just once yesterday (and a visual glich on my wallpaper at the same time), that's why I restarted Opera. Today I can reproduce consistently with Opera on neon unstable after changing Lattency settings in Compositor KCM. 1. open Opera 2. open Compositor KCM 3. change Lattency setting and apply the change 4. go back to Opera window by clicking on its entry in task manager 5. click or scroll the page in Opera: window reacts as expected 6. minimize and unminimize Opera by clicking on task manager Result: Opera window is frozen. Scrolling and mouse clicks have no visual effect.
Cannot reproduce with VLC.
I believe this issue should be fixed. There was a bug wrt handling of xwayland windows changing wl_surface objects. If you can reproduce this issue in git master, please reopen this bug report.