For RX580:
- Working driver (manual install): https://drivers.amd.com/drivers/linux/amdgpu-pro-20.45-1188099-ubuntu-20.04.tar.xz
- https://math.dartmouth.edu/~sarunas/amdgpu.html
sudo ./amdgpu-install --opencl=legacy --headless --no-dkms
For RX5700XT:
- Install Debian driver repo: https://repo.radeon.com/amdgpu-install/21.40.1/ubuntu/focal/amdgpu-install_21.40.1.40501-1_all.deb
sudo apt install firmware-amd-graphics
sudo apt install libnuma1
sudo amdgpu-install --usecase=opencl --opencl=rocr,legacy --accept-eula --no-dkms