From owner-freebsd-acpi@FreeBSD.ORG  Wed Jun 20 16:12:07 2012
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From: Sean Bruno <seanbru@yahoo-inc.com>
To: Andriy Gapon <avg@FreeBSD.org>
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Date: Wed, 20 Jun 2012 09:11:26 -0700
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Cc: "sbruno@freebsd.org" <sbruno@FreeBSD.org>,
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Subject: Re: [CFT] Sparse Cstate Support -- Its possible, that I don't know
 what I'm doing.
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On Tue, 2012-06-19 at 22:00 -0700, Andriy Gapon wrote:
> > It seems that the rc.conf value of performance_cx_lowest="LOW" is
> what I
> > really want, not economy_cx_lowest. 
> 
> Yes.  Could you please try this without using your patch?
> 
> I get an impression that its effect was to actually request C2 when
> cx_lowest is
> set to C1.
> 
> -- 
> Andriy Gapon 

Confirmed.  If I set performance_cx_lowest="LOW" then the system sets
the "C2" state and really implements C3 correctly.  I see a 25 watt
power saving without the patch on the Dell r410.

sean