From mboxrd@z Thu Jan 1 00:00:00 1970 From: Rodney Cacy Subject: Re: understanding acpi Date: Mon, 04 Dec 2006 13:24:04 +0100 Message-ID: <45741364.5040308@tlen.pl> References: <456EB894.20306@imag.fr> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: Received: from d1.imc.pcz.czest.pl ([212.87.226.194]:4615 "HELO d1.imc.pcz.czest.pl") by vger.kernel.org with SMTP id S936207AbWLDMVY (ORCPT ); Mon, 4 Dec 2006 07:21:24 -0500 In-Reply-To: <456EB894.20306@imag.fr> Sender: linux-acpi-owner@vger.kernel.org List-Id: linux-acpi@vger.kernel.org To: linux-acpi@vger.kernel.org I'm not an expert but you can pass a boot kernel option: processor.max_cstate More inforamtion in http://www.columbia.edu/~ariel/acpi/acpi_howto.txt, section 7. Write me about the results. Now I'm working under suspending sound,lan etc. to save battery but soon I will work with the noise reduction. Cacy Oliver Henriot wrote: > Hi all list subscribers, > > I'm looking for info on how acpi functions in order to get it to work > the best possible on my computer. It's a Sony laptop (vaio vgn-sz3xp/c, > core2duo) running Debian Etch. In particular, I'm looking for ways to > reduce thermal dissipation from the CPU as much as possible, in order to > queep the machine as quiet as possible. From the various docs I've read, > so far I seem to understand that C-states is the way to go, throttling > being probably not very efficient. > > When I'm running on batteries, C3 state is active (as shown by cat > /prc/acpi/processor/CPU0/power) and is the main state, whereas when I'm > running on mains, C3 disappears and only C1 and C2 remain. > > My question are : wouldn't it be better if I could use C3 even when on > mains. Wouldn't it be even better with C4? As suggested by "Why My Cx > Power State Is Not Used" I tried unloading various modules (e.g. those > concerning usb but I got stuck with usbcore which refused to unload > despite nothing usb being connected) without any success. Being > relatively new to GNU/Linux, I'm a bit stuck here and don't know where > to look or what to make of this. > > Any help would be gladly welcome. > > Cheers, > > Oliver > - > To unsubscribe from this list: send the line "unsubscribe linux-acpi" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > >