AMDGPU vs. Radeon DRM Driver Performance On Linux 4.15
Dota 2 with OpenGL was slightly faster on the four tested Southern/Sea Islands hardware.
Dawn of War 3 didn't see any real performance change and with the R9 290 it was hanging for this game on the Radeon DRM.
Except for some regressions with the R7 260X, the AMDGPU DRM driver was offering some noticeable performance improvements when running Mad Max on these older graphics cards.