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From: Hans Petter Selasky <hselasky@c2i.net>
To: freebsd-current@freebsd.org
Date: Mon, 4 May 2009 09:26:37 +0200
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Cc: Alexander Motin <mav@freebsd.org>, FreeBSD acpi <freebsd-acpi@freebsd.org>,
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Subject: Re: Fighting for the power.
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> 2. PCI devices
> PCI bus provides method to control device power. For example, I have
> completely no use for my FireWire controller and most of time - EHCI USB
> controller. Disabling them allows me to save about 3W of power. To
> disable all unneeded PCI devices you should build kernel without their
> drivers and add to loader.conf:
> hw.pci.do_power_nodriver=3
> To enable devices back all you need to do is just load their drivers as
> modules.

The new USB stack should turn off USB HC's automatically when not in use. At 
least the schedules will get disabled. Did you do any research on this?

--HPS