From owner-freebsd-current@FreeBSD.ORG Mon May 4 03:45:14 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 EE595106566B; Mon, 4 May 2009 03:45:14 +0000 (UTC) (envelope-from mav@FreeBSD.org) Received: from cmail.optima.ua (cmail.optima.ua [195.248.191.121]) by mx1.freebsd.org (Postfix) with ESMTP id 0B5428FC15; Mon, 4 May 2009 03:45:13 +0000 (UTC) (envelope-from mav@FreeBSD.org) X-Spam-Flag: SKIP X-Spam-Yversion: Spamooborona-2.1.0 Received: from [212.86.226.226] (account mav@alkar.net HELO mavbook.mavhome.dp.ua) by cmail.optima.ua (CommuniGate Pro SMTP 5.2.9) with ESMTPSA id 241861314; Mon, 04 May 2009 06:45:12 +0300 Message-ID: <49FE64C5.2020507@FreeBSD.org> Date: Mon, 04 May 2009 06:45:09 +0300 From: Alexander Motin User-Agent: Thunderbird 2.0.0.21 (X11/20090405) MIME-Version: 1.0 To: Adam McDougall References: <49FE1826.4060000@FreeBSD.org> <20090504011421.GI6901@egr.msu.edu> In-Reply-To: <20090504011421.GI6901@egr.msu.edu> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit 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 03:45:15 -0000 Adam McDougall wrote: > 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" Yes, backlight is also important. But there is not so much things could be done. When I am leaving system for some time, I can just close the lid, if not put system into S3 state, which require very small power (at least I was unable to really measure it without all-day-long testing). Thanks to jkim@ we have more or less working S3 state for amd64 now. -- Alexander Motin