Looks like this is a known bug: https://bugs.launchpad.net/ubuntu/+source/mutter/+bug/1927948


This works for me DRI_PRIME=1 app_you_want_to_run_into_discrete you can also add "DRI..." indicator inside the destination run box desktop icon too. Edit: you can check this option works reading temperatures with lm-sensors sudo apt-get install lm-sensors


Delete this file by sudo rm /etc/modprobe.d/blacklist-amdgpu.conf and reboot. You installed wrong drivers that blacklisted the original one.


Luckily length of new grub option matches length of existing options (it is not longer). I guess --- is used to inform end of options, I've just booted 20.04 LTS (I assume it either applies that same to 18.04 LTS or as one year passed it is Ok for you to use 20.04 LTS now) replacing "quiet splash ---" with "toram" and have not noticed any ...

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