I guess 5.9 would be recommended.
You will need 4 packages
linux-headers-XX
linux-headers-XX-generic
linux-image-unsigned-XX-generic
linux-modules-XX-generic
from https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.9.15/
You will also have to download all firmware files that begin with “renoir” from here
https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/tree/amdgpu
and put them into
/lib/firmware/amdgpu
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