https://bugs.freedesktop.org/show_bug.cgi?id=91880
--- Comment #190 from notog@amail.club --- With 4.16.6, it seems to be fixed! With a fresh installation of Antergos 18.4, tested with different kernel arguments, `radeon.cik_support=0 amdgpu.cik_support=1 amdgpu.dpm=1` is all that's needed to work fine. amdgpu.modeset=1 does not actually do anything according to logs. I ran different tests from glxgears to unigine valley and heaven, they seemed to work fine without any issues.
hardware: MSI R9 390 Gaming 8G kernel: 4.16.6 mesa: 18.0.2 xorg-server: 1.19.6 xf86-video-amdgpu: 18.0.1 kernel arguments: radeon.cik_support=0 amdgpu.cik_support=1 amdgu.dpm=1