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: Fri, 25 Jun 2004 14:46:38 +0200 Sender: acpi-devel-admin-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org Message-ID: <20040625124637.GA14795@rap.rap.dk> References: <20040624153513.GB19545@rap.rap.dk> Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable Return-path: Content-Disposition: inline In-Reply-To: Errors-To: acpi-devel-admin-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , List-Archive: To: Michael Frank Cc: Keld =?iso-8859-1?Q?J=F8rn?= Simonsen , acpi-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org List-Id: linux-acpi@vger.kernel.org On Fri, Jun 25, 2004 at 01:40:04AM +0800, Michael Frank wrote: > On Thu, 24 Jun 2004 17:35:13 +0200, Keld J=F8rn Simonsen =20 > wrote: >=20 > >Dear ACPI developers, > >I have a problem with my Acer Travelmate 233. > >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). > >I do not have the skills to program this myself, so > >instead I offer a prize of USD 1000 to the person(s) that > >can give me a patch for kernel 2.6 and appropiate documentation > >that can solve the above problem. The patch needs to be GPL, > >and demonstrably run on my laptop. I need the patch before > >2004-10-01, after what date the prize offer expires. > >I would like that the patch was written in a general way to cover for > >CPUs that burn considerable power in idle loop and other states, so th= at > >other users can benefit from it. Also I would prefer that the patch be > >rolled into the normal ACPI kernel source tree, but the latter request > >is not a condition for the prize. > > >=20 > Nice idea but it wont be possible to program it as your hardware powers > the CPU which takes 5w while it is powered. There is no partitioning > which allows you to remove power from the CPU while running the rest > and I am not aware of any system or standards which provide this kind > of partitioning... Well, I don't know so much about ACPI, but I thought that you in S2 could shut down devices individually, and then at the end for my purpose shut down the CPU completely, like a suspend to memory. But maybe this is not doable. 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