I don’t know if it answers your question, but I put the above parameters into grub. To temporarily change those, I hit E in the corresponding option into the grub menu on boot (I have a separate disk with Windows too).
I checked the modprobe.d folder and inside there are amdgpu.conf and radeon.conf. Opening the AMD one it says
I wonder whether it’s the same root issue as this:
There are some extra patches coming which might resolve the issue. If you want to test those, I’ve included them in a linux-zen build (5.10.1.zen1-1.0 in my repo, under the testing subdirectory, it works for me).
I searched a bit about linux-zen (as I didn’t knew about it) and decided to give it a try (through AKM).
Since yesterday, everything seems to work fine (I had to install r8168-dkms too).
I’m using Mint 20 and having the same problem as jimmy213. Also Greek, which is coincidence. He got it working with Kernel 5.9.14-zen1-1-zen, but is there an equivalent for Ubuntu based distros?
Don’t know if this will help, but Rolling Rhino is a rolling version of Ubuntu, and may well have the capability to run a newer kernel. Mine’s on mainline, though (and I’m not on it right now) so I can’t check…