From owner-freebsd-current@FreeBSD.ORG Mon Jul 6 12:55:38 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 CD7121065675 for ; Mon, 6 Jul 2009 12:55:38 +0000 (UTC) (envelope-from aragon@phat.za.net) Received: from mail.geek.sh (decoder.geek.sh [196.36.198.81]) by mx1.freebsd.org (Postfix) with ESMTP id 661E08FC08 for ; Mon, 6 Jul 2009 12:55:38 +0000 (UTC) (envelope-from aragon@phat.za.net) Received: from igor.geek.sh (unknown [196.209.244.147]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by mail.geek.sh (Postfix) with ESMTPSA id E3ADA3A465; Mon, 6 Jul 2009 14:55:36 +0200 (SAST) Message-ID: <4A51F444.7050803@phat.za.net> Date: Mon, 06 Jul 2009 14:55:32 +0200 From: Aragon Gouveia User-Agent: Thunderbird 2.0.0.21 (X11/20090331) MIME-Version: 1.0 To: Rene Schickbauer References: <18510.213.150.228.38.1246864978.squirrel@mail.magicbooks.org> <20090706100602.00003969@unknown> <12908.213.150.228.38.1246870577.squirrel@mail.magicbooks.org> In-Reply-To: <12908.213.150.228.38.1246870577.squirrel@mail.magicbooks.org> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Cc: freebsd-current@freebsd.org, Gergely CZUCZY Subject: Re: RFC: powerd Patch & proposed future changes 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, 06 Jul 2009 12:55:39 -0000 Rene Schickbauer wrote: > Hi! > >> I think this is a very nice idea, especially the TFT backlight part. It >> also might be useful to adjust the WiFi transmit power level according >> to battery state. That can also save some power, especially on >> portables. > > Yes, changing the transmit power would be possible. Although adjusting the > transmit power via script on a *mobile* computer is likely to get the user > offline rather quickly. > > On the other hand, powerd would just run a script. This script could start a > user-written daemon to continually adjust power level.. and when ac is > plugged in again, the script kills that daemon. I sincerely doubt that would > save you any amount of power worth mentioning, though but may give you > additional troubles. But maybe you could restrict an a/b/g card to b/g or a > and thus save some power. FWIW, changing transmit power on my Intel 4965 based system made zero difference to overall power consumption. Regards, Aragon