Comment # 9 on bug 76130 from Adrien Prost-Boucle

I forgot to mention the OS I'm using:

ArchLinux x86-64
Linux 4.0 from testing repo (also happens with the kernel from core repo)
mesa 10.5.4 from stock core repo
xf86-video-ati 1:7.5 from stock core repo

No patch, no personal kernel boot options, basically zero config.