[Bug 21452] Hang when switching back to console if the ForceLowPowerMode option is enabled

[bugzilla-daemon at freedesktop.org]

http://bugs.freedesktop.org/show_bug.cgi?id=21452





--- Comment #7 from Alex Deucher <agd5f at yahoo.com>  2009-05-20 10:40:55 PST ---
(In reply to comment #6)
> > 
> > Removing the "ClockGating" option from your config will also prevent that code
> > from being called.
> > 
> 
> but wouldn't that mean that (in both cases?) power management is not fully
> running on my board? or does ForceLowPowerMode somewhat override/surpasses
> ClockGating's function anyway?
> 

There are 3 options which can be used individually or combined:

1. ClockGating - Enables chips specific power saving features like clock gating
that are handled by the hardware directly.  This doesn't really do much on
r6xx/r7xx boards yet.
2. DynamicPM - Automatically reduces the engine clock and pcie lanes when dpms
has powered down the displays
3. ForceLowPowerMode - Runs the chip at a constant reduced engine clock and
pcie lanes.


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