Are(In reply to comment #6)
> Now for your glxgears test: reclocking works (in Portal 2 as well, where I
> get 58-60 FPS now). The only difference is the radeon.dpm=1 on the kernel
> command line.

Are you absolutely sure you need radeon.dpm=1 ? Reclocking works here (R9 290X)
without it. I just rechecked and I don't have it on my kernel command line (new
"drm-next-3.17" branch). Nor do I have it anywhere in /etc.