Can you confirm this issue is/is-not relevant any more on either of:- * Debian Bullseye (testing) * Debian Buster (stable) with the backported version of kernel (5.10.0-0.bpo.7) installed.
Amdgpu has improved a long way since the time this bug report was created, and would be good to get the bug closed or issue forwarded upstream if still relevant. --simon