From mboxrd@z Thu Jan 1 00:00:00 1970 From: Keld =?iso-8859-1?Q?J=F8rn?= Simonsen Subject: Re: problem with cpu eating too much power, prize given if solved Date: Wed, 30 Jun 2004 00:50:08 +0200 Sender: acpi-devel-admin-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org Message-ID: <20040629225008.GA3159@rap.rap.dk> References: <20040624153513.GB19545@rap.rap.dk> <20040628204008.GK698@openzaurus.ucw.cz> <20040629155718.GA1866@rap.rap.dk> <20040629221019.GA25464@elf.ucw.cz> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: <20040629221019.GA25464-I/5MKhXcvmPrBKCeMvbIDA@public.gmane.org> Errors-To: acpi-devel-admin-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , List-Archive: To: Pavel Machek Cc: Keld J?rn Simonsen , acpi-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org List-Id: linux-acpi@vger.kernel.org On Wed, Jun 30, 2004 at 12:10:19AM +0200, Pavel Machek wrote: > Hi! > > > > > Many times I just want to read the screen, eg emails or documents, > > > > and then still the cpu will be in idle mode, where > > > > it uses 7.5 W out of the about 15 W that the whole machine uses. > > > > I have found out from Intel data sheets that my > > > > Mobile Intel Celeron 2.0 GHz CPU consumes 7.5 W in idle loop/ > > > > stop grant/sleep states, (and 5.0 W i deep sleep state). > > > > > > > > So I would like to have the CPU stopped completely (consuming 0 W) > > > > while I still could read the screen. In that way I should > > > > be able to have about double the lifetime on the battery, > > > > going to about 7 hours from the 3.5 hours I have now. > > > > > > > > I would like the machine to wake up again by any keystroke > > > > on the keyboard or mouse input. I would like the input to be > > > > reacted upon (not just used to wake up the system, and > > > > then forgotten). > > > > > > > > > > S1 is what you want... but... if you get what you asked for, > > > do you realize that for example clock would not update on the desktop > > > in this mode? > > > > Maybe S1 is what could do this. I understand that I could not then have > > the clock updated every second but every minute would work, and even if > > the screen was not updated every minute it would be fine. But I would > > expect the clock to be accurate when the cpu is started again. > > Can you verify that your hardware can do S1? (cat /proc/acpi/sleep). It says: S0 S3 S4 S5 /sys/power/state says: standby mem disk Best regards keld ------------------------------------------------------- This SF.Net email sponsored by Black Hat Briefings & Training. Attend Black Hat Briefings & Training, Las Vegas July 24-29 - digital self defense, top technical experts, no vendor pitches, unmatched networking opportunities. Visit www.blackhat.com