Date: Mon, 6 Jul 2009 10:56:17 +0200 (CEST) From: "Rene Schickbauer" <cavac@magicbooks.org> To: "Gergely CZUCZY" <gergely.czuczy@harmless.hu> Cc: freebsd-current@freebsd.org Subject: Re: RFC: powerd Patch & proposed future changes Message-ID: <12908.213.150.228.38.1246870577.squirrel@mail.magicbooks.org> In-Reply-To: <20090706100602.00003969@unknown> References: <18510.213.150.228.38.1246864978.squirrel@mail.magicbooks.org> <20090706100602.00003969@unknown>
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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. Some laptops let you power down the normal (cabled) network adapter. When your out of reach for AC power, you're very unlikely lugging a network cable around the building. Also, you may power down/unload inbuild audio, webcam, bluetooth, modem, serial port etc. If you're desperate, disallowing CDROM and SWAP operation may save you a ton of power, too. As i said, with user scripting triggered by powerd state changes, you could get *really* creative (like temporarly halting any mencoder and ffmpeg process while on battery power ;-). LLAP & LG Rene Schickbauer -- Hackerkey: http://tinyurl.com/pof37z
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