Comment # 10 on bug 103175 from Andy Furniss

Testing from head of drm-next-4.15 I can change minor to 19 and 20 in
drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
and am stable so can test.

19 gives good perf 20 bad, so setting as duplicate.

*** This bug has been marked as a duplicate of bug 103100 ***