From mboxrd@z Thu Jan 1 00:00:00 1970 From: Oliver Henriot Subject: Re: understanding acpi Date: Mon, 04 Dec 2006 15:21:01 +0100 Message-ID: <45742ECD.6090203@imag.fr> References: <456EB894.20306@imag.fr> <45741364.5040308@tlen.pl> Mime-Version: 1.0 Content-Type: multipart/signed; protocol="application/x-pkcs7-signature"; micalg=sha1; boundary="------------ms050600060705070107090509" Return-path: Received: from imag.imag.fr ([129.88.30.1]:49095 "EHLO imag.imag.fr") by vger.kernel.org with ESMTP id S936892AbWLDOVP (ORCPT ); Mon, 4 Dec 2006 09:21:15 -0500 In-Reply-To: <45741364.5040308@tlen.pl> Sender: linux-acpi-owner@vger.kernel.org List-Id: linux-acpi@vger.kernel.org To: Rodney Cacy Cc: linux-acpi@vger.kernel.org This is a cryptographically signed message in MIME format. --------------ms050600060705070107090509 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 8bit Hi, Rodney Cacy a écrit : > I'm not an expert but you can pass a boot kernel option: > > processor.max_cstate Yes, I'd actually tried setting processor.max_cstate=4 a while ago to see if this changed anything and indeed, instead of reading max_cstate : C8 from /proc/acpi/processor/CPU0/power as I usually get, I got max_cstate : C4 Obivious, and no good either, unfortunately. I still ran at C2 on mains and C3 on battery. I suspect my settings in /etc/acpi are not good and I'm looking for a fine manual I could rtfm in order to understand what I should doo to fine tune acpi on my machine. Where I'm stuck is to find the fine manual which I'll actually understand (I may not be very smart... ;-) ) and manage to put into application. > More inforamtion in > http://www.columbia.edu/~ariel/acpi/acpi_howto.txt, section 7. Yes, I'm actually trying to understand sections 6.3 through 6.6 of that same document, which I suspect are precisely what I'm looking for and also point at /etc/acpi. My relatively limited skills are preventing me from getting any further at the moment, but I am confident I will eventually make something of it. > 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 Cheers, P.S. considering the level of other discussions on this list, I suspect I have pointed my questions to the wrong place. Question : is there a noob oriented discussion list for acpi? Anyway, sorry for the list pollution with such "low level" questions. > > > 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 >> >> > > > - > 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 --------------ms050600060705070107090509 Content-Type: application/x-pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; 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