Comment # 41 on bug 62959 from Alexandre Demers

(In reply to comment #40)
> in /etc/environment I have R600_DEBUG=nodma ever since discovering that
> setting, i.e.: also now the R6))_DEBUG is set to nodma.
> 
> I did not apply any of your patches over the 3.9.0-rc7 kernel.

If I was you, I would test without R600_DEBUG=nodma to see if there is any
difference between kernels 3.8 and 3.9. I would also try patching 3.9-rc7 with
attachment 77608 [details] [review] or attachment.