Comment # 15 on bug 56865 from Alex Deucher

(In reply to comment #14)
> Created attachment 69769 [details]
> Current drirc configuration suitable for mesa 9.0
> 
> Until today both pp_jimenezmlaa and pp_jimenezmlaa_color were set to 8

<device screen="0" driver="r600">

This would only work on mesa 9.x.  You'll need:

<device screen="0" driver="dri">

for mesa 8.x