From mboxrd@z Thu Jan 1 00:00:00 1970 From: Pavel Machek Subject: Re: problem with cpu eating too much power, prize given if solved Date: Wed, 30 Jun 2004 21:37:39 +0200 Sender: acpi-devel-admin-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org Message-ID: <20040630193739.GC12631@elf.ucw.cz> References: <20040624153513.GB19545@rap.rap.dk> <20040628204008.GK698@openzaurus.ucw.cz> <20040629221111.GB25464@elf.ucw.cz> <20040630173754.GA29587@rap.rap.dk> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: <20040630173754.GA29587-EittdKFJ/bZ/SzgSGea1oA@public.gmane.org> Errors-To: acpi-devel-admin-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , List-Archive: To: Keld J?rn Simonsen Cc: Michael Frank , acpi-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org List-Id: linux-acpi@vger.kernel.org Hi! > > Please refer to http://acpi.sourceforge.net/documentation/sleep.html > > and ACPI spec 2.0a around Page 216 > > > > "Sleep States > > S1 - "Stopgrant" > > Power to cpu is maintained, but no instructions are executed. > > The CPU halts itself and may shut down many of its internal > > components. In Microsoft Windows, the "Standby" command > > is associated with this state by default. > > " > > Well, I think what I want is S2, from the same document: > > S2 > > While defined in the spec, this state is not currently in use. It > resembles S3 with the qualification that some devices are permitted to > remain on. ... > I would like the CPU to power down, save things in memory, and then > still have the screen and associated hardware on, and possibly also the > keyboard and mouse if that is needed to capture an ACPI event, including > the actual keystroke. This seems to be S2. I am not sure if all of S2 > needs to be implemented to do what I asked for, I just would like the > functionality I described. Unfortunately, your machine does not support S2. Actually, I do not know any machine that does. > > So again, which (mainboard/notebook) HW does depower the CPU and keeps the > > rest running ? > > I thought this was something that most mainboards would support, given > that we make the appropiate SW in the kernel. > > Another thing is that if a mainboard/BIOS supports ACPI, then it should > actually support all of ACPI, including S2 support. Or am I wrong? You are wrong at this. It is completely okay to support ACPI but no sleep states at all (for example). Pavel -- People were complaining that M$ turns users into beta-testers... ...jr ghea gurz vagb qrirybcref, naq gurl frrz gb yvxr vg gung jnl! ------------------------------------------------------- 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