[Bug 91268] R6xx freezes with kernel 3.17 and up

https://bugs.freedesktop.org/show_bug.cgi?id=91268

--- Comment #18 from Michel Dänzer michel@daenzer.net --- (In reply to Christian König from comment #11)

Considering how old the hardware is I suggest that we just disable that feature for anything older than R7XX.

fglrx was already using write-combined CPU mappings with the very first PCIe GPUs (RV3xx), so I don't think it's that simple.

I was hoping that we'd find something to key off a quirk in the dmesg output, but since we can't seem to get that, maybe this is the best we can do for now. :(