Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753755AbYHKNWl (ORCPT ); Mon, 11 Aug 2008 09:22:41 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751532AbYHKNWb (ORCPT ); Mon, 11 Aug 2008 09:22:31 -0400 Received: from one.firstfloor.org ([213.235.205.2]:48088 "EHLO one.firstfloor.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751511AbYHKNWa (ORCPT ); Mon, 11 Aug 2008 09:22:30 -0400 Date: Mon, 11 Aug 2008 15:23:32 +0200 From: Andi Kleen To: S K Cc: Andi Kleen , Zhao Yakui , Thomas Renninger , Alan Jenkins , linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org Subject: Re: cpufreq doesn't seem to work in Intel Q9300 Message-ID: <20080811132332.GR9038@one.firstfloor.org> References: <514e099a0808030300u140a0ae7m92a2e7294f39f7b7@mail.gmail.com> <200808081430.43012.trenn@suse.de> <200808092059.47863.trenn@suse.de> <514e099a0808100128u303207clcb22292db2f0cc59@mail.gmail.com> <1218418431.6671.52.camel@yakui_zhao.sh.intel.com> <514e099a0808102144n241c8e9ak255bded0a80744f1@mail.gmail.com> <1218432270.6671.75.camel@yakui_zhao.sh.intel.com> <874p5r3jow.fsf@basil.nowhere.org> <514e099a0808110615i42ade5dctc31d87b483095e35@mail.gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <514e099a0808110615i42ade5dctc31d87b483095e35@mail.gmail.com> User-Agent: Mutt/1.4.2.1i Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1158 Lines: 27 On Mon, Aug 11, 2008 at 06:15:09AM -0700, S K wrote: > > It sounds like the BIOS just doesn't support frequency scaling. > > Perhaps it's disabled in the BIOS setup. Or the system doesn't > > support it at all. > > It works in Windows XP, so I'm not sure if it's only a BIOS issue. On Windows platform drivers sometimes provide a replacement DSDT that might enable cpufreq. If that's the case there's nothing we can do really on the Linux side. You might be able to extract that DSDT from somewhere and supply it to Linux as a replacement DSDT, but that's not a supported configuration in the kernel. > If it's not that simple, then care to impart some knowledge? If you can't get your BIOS to provide the necessary methods then useful Linux cpufreq won't work. It's that simple. p4-clockmod aka throttling might work, but it doesn't actually save energy and often causes severe performance problems. -Andi -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/