linux-kernel - Re: Enabling power states for Core 2 Duo

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Message-ID: <8aa016e10705220937t6cfbacbj4fe8fc97d135924@mail.gmail.com>
Date:	Tue, 22 May 2007 22:07:24 +0530
From:	"Dhaval Giani" <dhaval.giani@...il.com>
To:	paapaa125@...mail.com
Cc:	linux-kernel@...r.kernel.org, hancockr@...w.ca
Subject: Re: Enabling power states for Core 2 Duo

> >>I'm probably missing something crucial here. So how do I enable power
> >>states? I'm using 64-bit Gentoo. My mobo is Asus P5B Deluxe. Otherwise
> >>ACPI works fine.
> >
> >The BIOS has to expose this support in ACPI, if it doesn't (which is often
> >the case on desktop boards) you won't get any C-state support (well, except
> >for C1 which is just the normal halt state).
>
> But unless I'm not mistaken, I don't have even the C1 state available. I
> seem to have only C0 according to "active state". "Active state is the sleep
> state currently used when the system is idle", isn't it? Here is the source:
>
> http://acpi.sourceforge.net/documentation/processor.html
>
> But are you saying that with most desktop mobos one doesn't usually have the
> different power states available at all? So basically the only means to
> conserve power is to scale the frequency?
>

Please update your BIOS and try.

Thanks and regards
Dhaval
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