https://bugs.freedesktop.org/show_bug.cgi?id=79980
--- Comment #6 from Andy Furniss adf.lists@gmail.com --- (In reply to comment #5)
(In reply to comment #3)
Does it still happen if you drop the PTE patches?
Is that stop poisoning the GART TLB?
Ok ignore that :-) I didn't spot the rs600