I got the same issue with a 3700U in a Lenovo T495 with the latest tumbleweed snapshot 20201011. Rolled back to 20201007 the GPU works fine. I don't understand why in https://build.opensuse.org/package/show/openSUSE:Factory/kernel-firmware revision 151 the AMDGPU Picasso workaround was dropped, but this issue is still open. The firmware is still buggy and makes my laptop unusable. Please tell me if I can give any debug output or test something.