well, today i (partially) realized why my basic drivers don’t work: the preinstalled packages amdgpu and amdgpu-dkms seem to not work due to amdgpu-dkms being unconfigured. tried configuring it and got the same error. around about there my system stopped using even the iGPU and i had to uninstall some other drivers (thanks @lena@gregtech.eu )
well, apparently the R9 M3xx is the problematic one
That’s odd given GCN1 and 2 will fully work in Linux with a compatibility toggle to enable AMDGPU support set in the kernel parameters, and GCN3 and newer natively supports AMDGPU without that toggle being required.