(In reply to comment #43)
> 3.6.11 was OK but also maybe is kinda 'old'.

Then try a 3.7 kernel if possible to see if a first bug was introduced there or
if it all happened in the 3.8 branch. If I remember correctly, there were some
changes about VM in 3.7 and some others about DMA in 3.8. Doing so should allow
us to work on one bug/change at a time.

Are you using latest mesa, drm and ddx?