Comment # 24
on bug 69723
from Alex Deucher
(In reply to comment #23) > 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? A power state consists of several performance levels (generally 3 on cayman; low, medium, and high). The driver loads a power state and then the GPU dynamically changes between the performance levels within that state based on GPU load. You can force the GPU to always stay in the low or high state via sysfs. See: http://www.botchco.com/agd5f/?p=57 for more info. That basically tells the GPU to stay in that performance level and to not dynamically transition between performance levels.
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