SUMMARY Windows instructed to work in fullscreen mode, e.g. Skype or Firefox playing YouTube, automatically exit that mode without any prompt from the user and repeatedly do so if the user re-enables fullscreen. STEPS TO REPRODUCE 1. Play a video on YouTube on Firefox 2. Make it fullscreen OBSERVED RESULT After a while, the video exits fullscreen. EXPECTED RESULT The video stays in fullscreen mode until the user exits it voluntarily. SOFTWARE/OS VERSIONS Linux: KDE Neon KDE Plasma Version: 5.21.1 KDE Frameworks Version: 5.79.0 Qt Version: 5.15.2 ADDITIONAL INFORMATION Using Mesa git updated to 23 February 2021 with an AMD Radeon Vega 8 GPU (in a Ryzen 5 2500U).
Never seen this. How strange. Does it stop happening if compositing is disabled?
(In reply to Nate Graham from comment #1) > Never seen this. How strange. > > Does it stop happening if compositing is disabled? It seems like it does stop. I just tried watching a brief video (https://youtu.be/7IOG92WEkOc): during the first half I disabled compositing and it worked as it should; in the second half I enabled compositing again and after a few seconds it exited fullscreen mode.
Thanks for the info!
X or wayland? How are you entering the fullscreen? We need something to indicate that it's kwin at fault
(In reply to David Edmundson from comment #4) > X or wayland? > How are you entering the fullscreen? > > We need something to indicate that it's kwin at fault X. In the case of YouTube videos I use the bespoke button of the Web player. The same happens with Skype and Teams, in which case I either double-click on the window or select "fullscreen" from the options. This happens throughout different applications and that it doesn't happen when compositing, so if it isn't KWin directly I suspect it may be how it reacts to something else.
Closing as I haven't experienced this in a while.