Comment 40 for bug 1189850

(In reply to comment #20)
> Created attachment 76040 [details] [review]
> Disable read-read optimisations
> And one last request, can you please test that this patch as a temporary
> solution?

This patch also fixes the issue. It was tested on 3.7.10 kernel as well as all previous patches. Now gonna try with drm-intel-next.