SUMMARY After upgrading to Plasma 6, the UI for things like Firefox gets corrupted when using two screens. See attachment for an example of what's happening. STEPS TO REPRODUCE 1. Add additional screen 2. Open many Firefox windows OBSERVED RESULT After some time, the Firefox UI will start flickering and showing UI corruption. EXPECTED RESULT Firefox should work as well as it did on Plasma 5.27 without GUI corruption. SOFTWARE/OS VERSIONS Operating System: Arch KDE Plasma Version: 6.0.2 KDE Frameworks Version: 6.0.0 Qt Version: 6.6.2 Kernel Version: 6.7.9 Graphics Platform: Wayland
Created attachment 167200 [details] Screenshot of UI corruption on Plasma
Do you have an NVIDIA GPU? Does it happen with a single screen? Is Firefox always involved, or does it also happen when Firefox isn't open? Does it happen on X11 too, or only Wayland?
(In reply to Nate Graham from comment #2) > Do you have an NVIDIA GPU? Nope, I'm using the iGPU that comes with a Ryzen 7 5850U PRO. I think it's marketed as Vega 8 and is of the Cezanne family. There's no dGPU on this laptop. > Does it happen with a single screen? So far not that I've seen, but I also stopped using Firefox because of it. I can try using it again on a single screen to see if it reproduces. > Is Firefox always involved, or does it also happen when Firefox isn't open? So far the main culprit is Firefox, because it is consistent, but when Firefox is open other things start to corrupt after a while, too. I'm also experiencing kwin titlebar corruption as reported here: https://bugs.kde.org/show_bug.cgi?id=484338 > Does it happen on X11 too, or only Wayland? I haven't tried on X11, but I'll give it a go. I've just been using Wayland consistently.
On a single screen, I've run into some UI corruption outside of Firefox on Wayland. Not sure if this is related, but I've uploaded a screenshot of what I'm seeing.
Created attachment 168327 [details] Screenshot of UI corruption outside of FF
That looks unrelated.
So I tried Firefox on X11, and there's no corruption. Looks like it's confined to Wayland.
Found that this corruption is limited to Firefox Nightly. Switching to the normal release fixed it.
Okay, that's definitely a bug in Firefox then. Please report it to Mozilla