https://bugzilla.kernel.org/show_bug.cgi?id=201295
--- Comment #3 from Michel Dänzer (michel@daenzer.net) --- Error -2 is -ENOENT, "No such file or directory", so the amdgpu/polaris11_mc.bin file is missing where the amdgpu module is loaded from (could be the initrd).
This is a configuration error, not a bug.