[Bug 68235] Display freezes after login with kernel 3.11.0-rc5 on Cayman with dpm=1

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=68235

--- Comment #19 from Alexandre Demers <alexandre.f.demers at gmail.com> ---
(In reply to comment #16)
> (In reply to comment #14)
> > Created attachment 85578 [details] [review] [review]
> > disable various dpm features
> > 
> > I would suggest disabling various dpm features and see if you can narrow
> > down which, if any, help.  This patch disables just about everything.
> > 
> > ni_dpm_force_performance_level(rdev, RADEON_DPM_FORCED_LEVEL_AUTO) is what
> > actually sets the dynamic performance switching into motion.  Prior to that
> > the hw is locked into the low performance level.  I sounds like there is
> > some bad parameter that is causing a lock up when the smc enables state
> > switching.
> > 
> > Separate from the patch can you also try changing the
> > ni_dpm_force_performance_level(rdev, RADEON_DPM_FORCED_LEVEL_AUTO) call in
> > ni_dpm_set_power_state() to low (RADEON_DPM_FORCED_LEVEL_LOW) or high
> > (RADEON_DPM_FORCED_LEVEL_HIGH) rather than auto?  See if you still get a
> > lock up.
> 
> I'll try it later today.

I had time for now to play with forcing RADEON_DPM_FORCED_LEVEL_LOW and
RADEON_DPM_FORCED_LEVEL_HIGH. The first one works fine, the second triggers the
problem.

I'm about to play with the suggested patch.

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