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I just installed Ubuntu 20.04.2 LTS recently (I'm a first time user) and I am experiencing a weird graphical glitch. The row of pixels at the top of my main monitor displays randomly flickering colours. For illustration purposes here is a short video:

https://i.imgur.com/9hxSoOW.mp4

I have 4 displays. 2 monitors hooked up to my CPU's graphics, as well as a TV and a main monitor hooked up to my GPU. The glitches only occur on the TV and main monitor, and only when the TV is turned on. alt + f2 and then typing "r" fixes the glitches, but only when the TV has been turned off.

So far I have tried installing new AMD drivers, but that didn't seem to fix the issue and installing them also failed (I think). I even updated to a completely new kernel, and tried using LightDM instead of GDM but that also didn't fix it.

I am a Linux noob and I'm out of ideas, how can I fix this? It's very annoying :(

  • Graphics card is AMD Radeon R9 280.
  • Gnome version 3.36.8
  • Windowing System X11
  • Kernel 5.10.17-051017-generic
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  • Have you tried restarting the GNOME-shell? There are two ways you can do this. alt+f2, type "r", and hit enter, OR through a terminal, gnome-shell --replace – Zany_Zachary1 Mar 11 at 18:44

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