On 5/4/09, Alexander Motin <mav_at_freebsd.org> wrote: > 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. Unloading modules doesnt put them back into into D3 state. You are forced to load some another module again to put wanted device into D3 state. -- PaulReceived on Mon May 04 2009 - 07:40:42 UTC
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