(In reply to Michel Dänzer from comment #30)
> I think at least the piglit regressions aren't directly related to
> sub-register liveness and should be tracked in a separate bug report:

 Those regressions are only reproducable here with sub reg liveness enabled.

>On my Kaveri, I've been seeing random failures of some (of the same as yours) >piglit tests recently (with sub-register liveness disabled). The only way I've >found to avoid those failures is to keep rebooting until I get lucky. It seems >like some recent change (most likely in Mesa?) causes the hardware to go into a >weird, semi-persistent state.

>I'm afraid it might be tricky to bisect that, but it would be very helpful.

 That sounds like a separate one, but i don't have that and can't reproduce it
on Kabini. I only have some known of those sometimes fails at random, but those
are under "warn" and just few of them (i am talking about just 1-3 tests), but
no "fail" tests happens here at random.