Plasma DE glitched display

Having an issue where DE starts glitching out as can be seen in attached screenshots.

I can enter TTY just fine but there is nothing of note in dmesg output. Other applications are not broken, for example I can run games, videos, text files, dolphin file manager just fine it is everything that is related to DE (panels, menus…) are broken.

Restarting DE via killall plasmashell && kstart5 plasmashell does not help. Logging out/in does not help as well, in that case the screen will be black without displaying anything except for moving mouse cursor.
Restarting the device does help but it is not a solution here.

My configuration is as follows:

Well, you know the standard troubleshooting procedure for stuff like this…

Create a new user, try to see if the problem is there. If it is not, you’ve messed up somewhere in the config. That’s then easily fixed by not messing up somewhere in the config.

If the problem persists on a new user, that’s a bit more problematic. That means the problem could be anything really, from a bug in the DE, to a hardware issue (like bad graphics drivers). But my guess would be that with a new user, there will be no problem. It’s probably a defective custom theme or something like that.


I’d bet on bad graphics drivers or stuff related to it (like mesa or whatever), from the looks of it…

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Quite possibly.

  Device-1: NVIDIA TU104 [GeForce RTX 2070 SUPER] vendor: ASUSTeK
    driver: nvidia v: 535.86.05 arch: Turing pcie: speed: 2.5 GT/s lanes: 16
    ports: active: none empty: DP-1, DP-2, HDMI-A-1, HDMI-A-2, Unknown-1
    bus-ID: 01:00.0 chip-ID: 10de:1e84 class-ID: 0300
  Device-2: AMD Raphael vendor: Micro-Star MSI driver: amdgpu v: kernel
    arch: RDNA-2 pcie: speed: 16 GT/s lanes: 16 ports: active: DP-3,HDMI-A-3
    empty: DP-4,DP-5 bus-ID: 14:00.0 chip-ID: 1002:164e class-ID: 0300
    temp: 46.0 C

But before troubleshooting that mess, it would be wise to rule out any bad config, by trying it with a new user.

Happens on another user as well, I did reorder desktop panels to suit me though.
No custom themes are used on both users. On the main user custom wallpaper is set but this shouldn’t be a problem.
I also run DE on igpu by using nvidia in on-demand mode.

I think I’ve managed to get better stability by switching amdgpu into high performance mode but it does increase amount of power it uses.

Still having the issue, changing into high-performance mode did not help in the end.