Comment 41 for bug 1810546

(In reply to notsyncing from comment #30)
> Finally got logs from serial port when freezed. Seems my problem has nothing
> to do with amdgpu. Maybe I should file a new bug.

I may be off the mark but that looks more like bug #196683. Have you tried adjusting "Power Supply Idle Control" in the BIOS (if you have it) or using zenstates.py to disable the C6 package state?