From mboxrd@z Thu Jan 1 00:00:00 1970 From: Keld =?iso-8859-1?Q?J=F8rn?= Simonsen Subject: Re: Mobile Intel Celeron 2.0 GHz with ICH4 bridge Date: Tue, 24 Feb 2004 17:26:21 +0100 Sender: cpufreq-bounces@www.linux.org.uk Message-ID: <20040224162621.GA32142@rap.rap.dk> References: <20040223213619.GA4634@rap.rap.dk> <20040224082222.GA8123@dominikbrodowski.de> Mime-Version: 1.0 Content-Transfer-Encoding: quoted-printable Return-path: Content-Disposition: inline In-Reply-To: <20040224082222.GA8123@dominikbrodowski.de> List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: cpufreq-bounces+glkc-cpufreq=gmane.org@www.linux.org.uk Content-Type: text/plain; charset="iso-8859-1" To: Keld =?iso-8859-1?Q?J=F8rn?= Simonsen , cpufreq@www.linux.org.uk On Tue, Feb 24, 2004 at 09:22:22AM +0100, Dominik Brodowski wrote: > On Mon, Feb 23, 2004 at 10:36:19PM +0100, Keld J=F8rn Simonsen wrote: > > Hi > >=20 > > I have an Acer Travelmate 233 and I am trying to save some battery > > power. Is that possible with cpufreq?=20 > >=20 > > The CPU is a Mobile Intel Celeron 2.0 GHz and the southbridge is an > > Intel 82801DB 845G/GL Chipset ISA Bridge (ICH4) > >=20 > > I run Mandrake 10.0 RC1 with kernel 2.6.2 and cpufreq 1.0.1, > > unfortunately I get the following message: > > cpufreq: Intel(R) SpeedStep(TM) for this chipset not (yet) available. > > Is this because I am running an outdated version of cpufreq, > > or just because the CPU is not recognized properly? >=20 > The problem is that you have a Mobile Celeron which does not support > SpeedStep. All you could get from cpufreq is Clock Throttling, > (p4-clockmod), but this won't save you much in terms of battery power. OK, understood. > > Are there other ways to save power with this machine, on the CPU? > ACPI processor support with working C1 and C2 idle states [check > /proc/acpi/processor/*/power ] As I can see it, my system already goes in autohalt. The normal=20 system power drainage is about 38 W, but I can measure the power use to about 18 W when I do nothing, (with my harddisk in sleep, and my screen turned to lowest intensity). I understand that throttling is actually putting the CPU off power. I would like to be able to shut off just the CPU, getting a savings of about 7,5 W. Is this possible, is there a way to shut off the CPU while having the screen and ram on power? What commands should I issue, or is this something I need to make a program to do? The idea is to shut off the CPU after it being idle for about a second, and resuming the operation next time I touch the keyboard or the mouse. 1 second would allow normal typing or normal mouse movement to perform as usual, while having the screen lit would give the impression of=20 the machine being on. Going from 18 W to about 11 W would give me about 2 hours more of battery time. best regards keld