From owner-freebsd-questions@FreeBSD.ORG Tue Jan 27 23:47:19 2009 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 96C75106566B for ; Tue, 27 Jan 2009 23:47:19 +0000 (UTC) (envelope-from shawnbadger@gmail.com) Received: from wf-out-1314.google.com (wf-out-1314.google.com [209.85.200.168]) by mx1.freebsd.org (Postfix) with ESMTP id 697428FC16 for ; Tue, 27 Jan 2009 23:47:19 +0000 (UTC) (envelope-from shawnbadger@gmail.com) Received: by wf-out-1314.google.com with SMTP id 24so7119788wfg.7 for ; Tue, 27 Jan 2009 15:47:18 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:message-id:date:from :user-agent:mime-version:to:subject:content-type :content-transfer-encoding; bh=iLwfEtZvqoCH4WmwKUEBXaPdOUL9W8vqULlURz/C9tM=; b=lQGMhHoxyfEfTCodpZODtePqonVy1QpXiDPAcAJInWd0NDD0QVGjlGu/0ysLn98RBd hlRINgemSEh0+5NHPCN9iZQrq4X9riSZ2Aaj4aioaSnpdJkoVcp98axn3A420/kNqztQ BOAVmI58NY1zF58tyU033FwQtK8LrbgT41tdY= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:date:from:user-agent:mime-version:to:subject :content-type:content-transfer-encoding; b=OqMFpA+WijzBkhnq+UQOYEyiU42psPlMF6fwEcbMElOtwMGMnSHH5Iyj8MQ6Q+HAJf iRT+ytrzFwUMvBhKTpuiOaSler+IKI+QnM1Hzt/jRuzRRTv5embHjsS6bHJHByW127M5 CroHW/J04cHxl1iVQKJLiGDjO4T2aNu0pq/VE= Received: by 10.142.173.14 with SMTP id v14mr923186wfe.245.1233098449946; Tue, 27 Jan 2009 15:20:49 -0800 (PST) Received: from ?192.168.1.132? (69.169.154.48.provo.static.broadweave.net [69.169.154.48]) by mx.google.com with ESMTPS id 32sm26618708wfa.20.2009.01.27.15.20.48 (version=TLSv1/SSLv3 cipher=RC4-MD5); Tue, 27 Jan 2009 15:20:49 -0800 (PST) Message-ID: <497F9683.3080905@gmail.com> Date: Tue, 27 Jan 2009 16:19:31 -0700 From: Shawn Badger User-Agent: Thunderbird 2.0.0.18 (X11/20081205) MIME-Version: 1.0 To: freebsd-questions@freebsd.org Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Subject: Laptop battery life on FreeBSD X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 27 Jan 2009 23:47:19 -0000 Hi, I recently installed FreeBSD 7.1 on my laptop, replacing Arch Linux and I noticed a significant drop in my battery life (from ~3 hours to ~1.5 hours). I realize that Linux has their "tickless" kernel, which I am sure explains the difference, but my question is... is there anything I can do in FreeBSD right now to improve this? And is there going to be any work done the kernel to allow the hardware to enter into a low-power state for an extended period of time? My laptop is an Acer Travelmate 4100 which has the following hardware: - Pentium M 1.6 GHz processer - 2 GB RAM - integrated video/sound - 802.11bg / bluetooth I'm somewhat of a minimalist and don't use X11. I've disabled the bluetooth adapter, but frequently use my wireless adapter (intel pro/2200bg). Does anyone have any suggestions that could potentially extend my battery life? Thank You, Shawn