From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1423157AbWJYJsH (ORCPT ); Wed, 25 Oct 2006 05:48:07 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1423158AbWJYJsH (ORCPT ); Wed, 25 Oct 2006 05:48:07 -0400 Received: from gprs189-60.eurotel.cz ([160.218.189.60]:50084 "EHLO amd.ucw.cz") by vger.kernel.org with ESMTP id S1423157AbWJYJsE (ORCPT ); Wed, 25 Oct 2006 05:48:04 -0400 Date: Wed, 25 Oct 2006 11:47:57 +0200 From: Pavel Machek To: "Michael (Micksa) Slade" Cc: linux-kernel@vger.kernel.org Subject: Re: Inspiron 6000 and CPU power saving Message-ID: <20061025094757.GA7658@elf.ucw.cz> References: <4532EBE2.6090709@knobbits.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <4532EBE2.6090709@knobbits.org> X-Warning: Reading this can be dangerous to your mental health. User-Agent: Mutt/1.5.11+cvs20060126 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Hi! > I recently discovered that my Inspiron 6000 uses about 50% more power > idling in linux than in windows XP. This means its battery life is > about 2/3 of what it could/should be. > > I guessed it might be the CPU, and did some tests. The results strongly > suggest as much. These are the results I got for power consumption in > various situations. > > linux idle at 800MHz: 27W > linux idle at 1600MHz: 36W > linux raytracing at 800: 30W > linux raytracing at 1600: 42W > > windows idle (presumably 800MHz): 16W > windows raytracing (presumably 1600MHz): 36W > > I've tried ubuntu dapper and ubuntu edgy, and RIP 10 (rescue disk) and > BBC 2.1 (rescue disk), and they all appear to have the same issue. The > machine's BIOS has no APM so I can't try it for comparison. Let me guess, UHCI? Remove usb modules, and measure again. For details, see 8hours on your lap presentation, linked from http://www.livejournal.com/~pavelmachek . Pavel