linux-kernel - Re: Battery life difference

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Message-ID: <20080705133601.GA20240@mit.edu>
Date:	Sat, 5 Jul 2008 09:36:01 -0400
From:	Theodore Tso <tytso@....edu>
To:	Felipe Balbi <felipebalbi@...rs.sourceforge.net>
Cc:	Kernel development list <linux-kernel@...r.kernel.org>,
	linux-acpi@...r.kernel.org
Subject: Re: Battery life difference

On Sat, Jul 05, 2008 at 04:17:01PM +0300, Felipe Balbi wrote:
> 
> . x61s with windows xp
> wifi on but not connected to any network, bluetooth on,
> display is in the less brighten state.
> 
> . x61s with ubuntu 8.04
> all radios off (modules removed and hw switch off),
> display is in the less brighten state.
> powertop runned and I did what it suggested me
> to do. Also did some other stuff from thinkwiki on
> how to reduce power consumption.

You didn't say which battery you are using; I'm guessing you are using
the 4 cell slim-line battery, which is rated at 28.8 Watt-hours?

How many Watts is Powertop reporting that you are using?  I'm down to
around 8-9 watts, and around 9.5 watts in "airplane mail reading mail"
(wireless disabled, USB modules unloaded, screen brightness turned way
down, laptop_mode enabled, all mail messages pulled into memory, and
reading/deleting mail using mutt, a character-mode based mail reader
--- if you use Evolution, your energy usage will definitely be higher  :-).

> Well, what could still be using the system power so
> much ?

See http://thunk.org/tytso/blog/2007/10/29/tip-o-the-hat-wag-o-the-finger-linux-power-savings-for-laptop-users/

					- Ted
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