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From: Darren Pilgrim <freebsd@bitfreak.org>
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To: Jessica Mahoney <root@varusonline.com>
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Cc: freebsd-advocacy@freebsd.org
Subject: Re: [Laptop] Battery Time
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Jessica Mahoney wrote:
> Quick recap:
> Windows Vista: 2 minute boot, 90 minutes of battery

What tuning did you do on Vista prior to your measurements?  A 
stock Vista install never actually goes idle, so it eats the 
battery life.

With FreeBSD if you run X with an alpha-blending WM and a 
background process to continually keep the CPU 10-20% loaded and 
the disk active, you also get poor battery life.

Vista, when properly tuned, will get better battery life than Vista 
because it can also turn off devices to save power.  FreeBSD lacks 
the ability to power down USB, wireless and wired net devices, 
CD/DVD drives, etc.