https://bugs.freedesktop.org/show_bug.cgi?id=32511
--- Comment #6 from Tormod Volden bugzi09.fdo.tormod@xoxy.net 2011-01-06 15:01:20 PST --- It seems to me that the frame buffer written to is tiled, and that the functions writing into it are unaware of this. I discussed shortly with Alex on IRC, and he said the savages have multiple apertures to the same framebuffer, some providing linear translation.
BTW, tiling is a prerequisite for DRI on savage, so I could not check if turning off tiling would fix it.
Would be nice if someone could explain how this is meant to work in mesa. I would like to continue debugging this, but I am stuck at this point without knowing how it should work.