Re: Fighting for the power.


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
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