Comment # 29 on bug 109628 from Michel Dänzer

(In reply to Mirek Kratochvil from comment #27)
> Anyway, the latest X driver from git is broken as well. Should the issue be
> reported there, or is it better to fix it in kernel layer?

It should be fixed in the kernel, since the xf86-video-amdgpu change in
question is already in the 19.0 releases.