Comment # 37 on bug 62959 from Alexandre Demers

(In reply to comment #36)
> Alex, despite having your 2nd patch in, the box just crashed and rebooted.
> I'll revert to your first patch to see if that one still helps.

By reading bug 62997 you've reported, you may be hitting more than one bug. I
had to report a couple of bugs myself about VM and DMA for Cayman.

Could you try kernel 3.9-rc7? I know a couple of patches went in there that
could help you.