Date: Mon, 06 Jul 2009 14:55:32 +0200 From: Aragon Gouveia <aragon@phat.za.net> To: Rene Schickbauer <cavac@magicbooks.org> Cc: freebsd-current@freebsd.org, Gergely CZUCZY <gergely.czuczy@harmless.hu> Subject: Re: RFC: powerd Patch & proposed future changes Message-ID: <4A51F444.7050803@phat.za.net> In-Reply-To: <12908.213.150.228.38.1246870577.squirrel@mail.magicbooks.org> References: <18510.213.150.228.38.1246864978.squirrel@mail.magicbooks.org> <20090706100602.00003969@unknown> <12908.213.150.228.38.1246870577.squirrel@mail.magicbooks.org>
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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
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