Date: Mon, 04 May 2009 06:45:09 +0300 From: Alexander Motin <mav@FreeBSD.org> To: Adam McDougall <mcdouga9@egr.msu.edu> Cc: FreeBSD acpi <freebsd-acpi@freebsd.org>, FreeBSD-Current <freebsd-current@freebsd.org>, freebsd-mobile@freebsd.org Subject: Re: Fighting for the power. Message-ID: <49FE64C5.2020507@FreeBSD.org> In-Reply-To: <20090504011421.GI6901@egr.msu.edu> References: <49FE1826.4060000@FreeBSD.org> <20090504011421.GI6901@egr.msu.edu>
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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
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