You kinda wanna add this kernel param to disable panel self-refresh (psr):
sudo grubby --update-kernel=ALL --args="amdgpu.dcdebugmask=0x10"
This is a long-standing issue that kinda flip-flops b/w fixed and broken. A search for amdgpu on the forum will reveal numerous threads, (most) all recommending adding the kernel param noted above.
The latest regression is being tracked here.