From owner-freebsd-current@FreeBSD.ORG Mon May 4 01:14:22 2009 Return-Path: Delivered-To: freebsd-current@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 7E5721065670; Mon, 4 May 2009 01:14:22 +0000 (UTC) (envelope-from mcdouga9@egr.msu.edu) Received: from mx.egr.msu.edu (surfnturf.egr.msu.edu [35.9.37.164]) by mx1.freebsd.org (Postfix) with ESMTP id 511428FC1C; Mon, 4 May 2009 01:14:22 +0000 (UTC) (envelope-from mcdouga9@egr.msu.edu) Received: from localhost (localhost [127.0.0.1]) by mx.egr.msu.edu (Postfix) with ESMTP id A600771EFEB; Sun, 3 May 2009 21:14:21 -0400 (EDT) X-Virus-Scanned: amavisd-new at egr.msu.edu Received: from mx.egr.msu.edu ([127.0.0.1]) by localhost (surfnturf.egr.msu.edu [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id nNISy7un-t4T; Sun, 3 May 2009 21:14:21 -0400 (EDT) Received: from localhost (daemon.egr.msu.edu [35.9.44.65]) by mx.egr.msu.edu (Postfix) with ESMTP id 839B871EFE4; Sun, 3 May 2009 21:14:21 -0400 (EDT) Received: by localhost (Postfix, from userid 21281) id 80A0E68D; Sun, 3 May 2009 21:14:21 -0400 (EDT) Date: Sun, 3 May 2009 21:14:21 -0400 From: Adam McDougall To: Alexander Motin Message-ID: <20090504011421.GI6901@egr.msu.edu> References: <49FE1826.4060000@FreeBSD.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <49FE1826.4060000@FreeBSD.org> User-Agent: Mutt/1.5.19 (2009-01-05) Cc: FreeBSD acpi , FreeBSD-Current , freebsd-mobile@freebsd.org Subject: Re: Fighting for the power. X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 04 May 2009 01:14:22 -0000 On Mon, May 04, 2009 at 01:18:14AM +0300, Alexander Motin wrote: I would like to summarize some of my knowledge on reducing FreeBSD power consumption and describe some new things I have recently implemented in 8-CURRENT. The main character of this story is my 12" Acer TravelMate 6292 laptop with C2D T7700 2.4GHz CPU, 965GM chipset and SATA HDD, under amd64 8-CURRENT. Great list! May I suggest screen brightness and DPMS as another tool to save power, I've measured a 5W difference from the screen draw. Keeping the brightness as low as tolerable helps considerably, but also using 'xset dpms 120 120 120' (modify to taste) in .xinitrc to turn off the screen after 2 minutes helps when the laptop isn't being used every second. May need this in xorg.conf: Option "dpms"