(In reply to comment #6)
> I'm experiencing the same problems on my HD6850, currently upgrading to
> master to see if it helps, however unlike Benjamin case my card hanged when
> I watched some movie (vpdu backend), the other time I was viewing some web
> page - there was a (old, via wine) game running in the backround though. 
> 
> The crashes seemed completely random, no indication what might have caused
> it. I'll attach log file containing first hang (I had to do a hard reset,
> sysrq didn't work, on the second occasion sysrq did work but there was no
> info in the log file but I think I've waited long enough, strange).

Please let me know after you test Mesa master. Thanks.