(In reply to comment #39)
> Created attachment 75272 [details] [review] [review]
> Possible fix for R600 hw deadlock
> 
> Patch has been tested on a system with AMD K8 CPU and Radeon AGP card (AMD
> RV670 / Radeon HD 3850) with both 3.6.11-030611-generic kernel (from Ubuntu
> kernel PPA mainline) and kernel built from recent drm-fixes git in the
> testing. This patch may also be relevant to reported Bug 47116 .

There is a lot of unrelated stuff going on in that patch.  Can you narrow down
what part fixes the issue?