Also confirming that removing xserver-xorg-video-intel solved the
problem for me too.
I did not also have /etc/X11/xorg.conf.d/20-intel.conf. However, I did
have /etc/X11/xorg.conf.d/01-amdgpu-pro-px.conf which was trying to load
the intel driver that was just removed:
jsalvo@rig01:~$ cat ~/xorg.conf.d-01-amdgpu-pro-px.conf
Section "ServerFlags"
Option "AutoAddGPU" "off"
EndSection
Section "Device"
Identifier "Intel"
Driver "intel"
EndSection
Section "Files"
ModulePath "/usr/lib/xorg/modules"
EndSection
Have to remove that file as well and then also do a:
sudo apt purge xserver-xorg-video-amdgpu-pro
... as the amdgpu-pro was installed when it was on 16.04 LTS, before the
upgrade to 20.04 LTS.
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https://bugs.launchpad.net/bugs/1867668
Title:
Visual artifacts in Gnome Shell when using the 'intel' Xorg driver
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