[Bug 69723] Computer freezes with kernel 3.11.0 / 3.12-rc1 (with bug 68235's patches applied) when dpm=1 on r600g (Cayman)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=69723

--- Comment #24 from Alex Deucher <agd5f at yahoo.com> ---
(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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