https://bugs.freedesktop.org/show_bug.cgi?id=69723
--- Comment #23 from Alexandre Demers alexandre.f.demers@gmail.com --- (In reply to comment #22)
(In reply to comment #19)
Official kernel 3.12 still failing with latest mesa and drm. It always ends up with a white screen when it freezes and it is impossible to connect remotely by SSH.
Would it be possible to add some debug/trace option to find where was the last recorded call or to print some key values/settings when they are changed/set? Maybe that could help narrow down where it hangs.
The problem is the driver is not really involved except for the initial programming of the states. The GPU does the reclocking internally once it's enabled. Best bet would be to adjust the values programmed into the state that's loaded into the SMC to see if you can narrow down what aspects are problematic.
Well, maybe the first thing would be to identify when or what sequence leads to the hang. That's why I was suggesting to trace it. But if I understand you correctly, you are saying the GPU is programmed once and then we just move from state to another, right?
I'm not sure, but I think I've read somewhere it was possible to set a power state manually, to force dpm to a given state in other words. Am I right?