[Intel-gfx] [PATCH 4/4] drm/i915: re-enable rc6 for ironlake

[Jesse Barnes]

On Wed, 27 Apr 2011 23:03:14 +0100
Chris Wilson <chris at chris-wilson.co.uk> wrote:
> > We should probably just enable fbc on the pipe connected to the
> > internal panel (if any) and keep it disabled otherwise.
> 
> On Arrandale, fbc is potentially a bigger win than rc6 - but is also a
> potential loss - right?

No, I think rc6 is still a much bigger win even on Arrandale (iirc >>1W
for rc6, ~0.5W for fbc best case).  And yeah, there is the potential for
increased power consumption when fbc is enabled if a framebuffer that
doesn't compress very well continues to get re-compressed over a long
period of time.

Jesse