Oh, I just realised you’re using a Pitcairn GPU, which means you’re likely on the older radeon driver rather than the newer amdgpu driver. Can you try with the amdgpu driver?
Instructions to check and switch are available here: https://wiki.archlinux.org/title/AMDGPU#Enable_Southern_Islands_(SI)and_Sea_Islands(CIK)_support
Pitcairn is Southern Islands.