From mboxrd@z Thu Jan  1 00:00:00 1970
From: Bruno Ducrot <ducrot-kk6yZipjEM5g9hUCZPvPmw@public.gmane.org>
Subject: Re: [PATCH] ACPI/Processor: C1/C3 states promotion and demotion
Date: Wed, 11 Feb 2004 12:03:38 +0100
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To: "Yu, Luming" <luming.yu-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
Cc: eric.piel-VkQ1JFuSMpfAbQlEx87xDw@public.gmane.org, "Brown, Len" <len.brown-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>, acpi-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org
List-Id: linux-acpi@vger.kernel.org

On Wed, Feb 11, 2004 at 10:19:22AM +0800, Yu, Luming wrote:
> > > Some processors seems to support only C1 and C3 states, for 
> > instance... mine ;-)
> > > (Pentium III Coppermine). The problem is that, in this 
> > case, no promotion or
> > > demotion are linking those two states, therefore the 
> > preocessor never goes to C3!
> > > 
> > 
> > There is no intel-like processors for which there is C3, but 
> > no C2.  So
> > you have actually to fake a C2 (which should be at a latency 
> > of 30 IIRC).
> > 
> 
> I'm not sure a faking C2 can work as expected, because
> C2 power state is an optional ACPI clock state that needs 
> chipset hardware support. (ACPI spec 2.0b  8.1.3)
> 

We are talking about a PIII Coppermine that need to be put in sleep
mode (C2) before deep sleep (C3).

-- 
Bruno Ducrot

--  Which is worse:  ignorance or apathy?
--  Don't know.  Don't care.


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