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When I try to use full screen mode on any program, be it sites under Firefox, games with Lutris/wine or VLC, the screen starts to flicker and switches between full-screen mode and a smaller resolution of the screen in the top left corner of my monitor.

Would be grateful for any ideas that could help me tackle this major problem.

I am using a 4K monitor and have fractional scaling enabled as an experimental feature. This seems to cause the problem, but I can't go without it since at 100% scaling everything is just too tiny to read and 200% doesn't look very good, so I keep everything at 150%.

Also this problem only started recently after I updated one of my Lutris games. I didn't have this problem before.

medipurp
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  • Hardware requirements, e.g. 4k graphic card and software Ubuntu OS and software capabilities. When both are ready, you can set System Setting > display setting to 4k resolution, imo. https://askubuntu.com/questions/788099/is-ubuntu-4k-ready – Sadaharu Wakisaka Nov 25 '19 at 00:45
  • You probably identified the culprit: an experimental feature. Can you not work around choosing a fixed scaling, but then changing the font scaling factor in Gnome Tweaks (Fonts tab)? This combination offers quite some flexibility to make it work acceptably. – vanadium Nov 25 '19 at 09:36
  • @vanadium while that works in some areas, Icons and UI scaled at 200% just take up way too much screen space, and the Font scaling doesn't scale most apps, so it only really works with Gnome Apps. Take this example. The System fonts are a good size for my monitor, but everything else is just way too big.

    This is 200% Display scaling and 75% font scaling.

     – medipurp Nov 25 '19 at 16:19

1 Answers1

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I'm using the same distribution (19.10) with 4k display scaled by factor 2 and i didn't face such issue for all applications, but any browser which is based on Chromium (Chrome, Opera, Chromium itself etc.) behaves exactly as you describe, even on Youtube with full-screen mode.

As a workaround i'm running google-chrome --force-device-scale-factor=1 with default page zoom at 200% for all websites (Chrome -> Settings -> Page Zoom).

P.S.
Advise you to check Gnome Extensions if you have, since i faced somehow similar weird bugs with applications scale in case of hidden Gnome top bar or left sidebar.

uptoyou
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  • Disabling the Gnome Top Bar hiding did it for me, never thought that would be the cause. Thanks! – Ivan Apr 23 '20 at 18:52