Bug#908632: linux-image-4.19.0-rc3-amd64-unsigned: kernel 4.19 fails to load amdgpu driver on R9 270X.

[felipe]

The problem persists on linux-image-4.19.0-rc6-amd64-unsigned and 
linux-image-4.19.0-rc7-amd64-unsigned.

The workaround mentioned above still fixes the problem on my end.