Suspend Issue AMD Graphics Driver Kubuntu 20.04

If you have the black screen of death when trying to get back from suspend mode, you might want to check out this bug description and possible resolutions: https://bugs.launchpad.net/ubuntu/+source/plasma-desktop/+bug/1849084

Otherwise disable compositor: qdbus org.kde.KWin /Compositor suspend

Check if compositor is enabled: qdbus org.kde.KWin /Compositor org.kde.kwin.Compositing.active
Or: qdbus org.kde.KWin /KWin supportInformation

Also an option: https://linuxconfig.org/amd-radeon-ubuntu-20-04-driver-installation

More info and troubleshooting: https://forums.linuxmint.com/viewtopic.php?t=293577

Might be worth investigating: https://github.com/Pergravis?tab=projects

Info: glxinfo | grep render
sudo lshw -c video
dmesg | grep -i amdgpu
inxi -G

Check performance: vblank_mode=0 glxgears

Started logging software installations:

xserver-xorg-hwe-18.04

Third party repository drivers:  sudo add-apt-repository ppa:oibaf/graphics-drivers
Remove third party drivers: sudo ppa-purge ppa:oibaf/graphics-drivers

2021-08-16 Random notes

sudo aptitude purge libdrm-amdgpu1 

https://ubuntuhandbook.org/index.php/2021/07/install-latest-mesa-ubuntu…
sudo apt install ppa-purge
Next purge the Ubuntu PPA which will downgrade all the installed packages:

sudo ppa-purge ppa:kisak/kisak-mesa
For Linux Mint 20, it’s recommended to add -d focal flag to work safely:

sudo ppa-purge -d focal ppa:kisak/kisak-mesa

glxinfo | grep "OpenGL version"

glxinfo | grep Mesa