(In reply to Michel Dänzer from comment #270)
> Are you 100% (or at least 99.99...% :) sure that the problem doesn't happen
> without this commit?

No I'm not, that's what bisect gave me, I don't know which one is it.
But I'm 100% sure the problem doesn't happen with kernel 3.16
Out of 7 bisects 4 were bad and 3 were good.
Each bad bisect happened within an hour of game play, as for good ones I marked
them as good after 4+ hours of active play. In my experience with this bug
that's more than enough to say it's good.