[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 #23 from Alexandre Demers <alexandre.f.demers at 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?

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