Re: Fighting for the power.
"M. Warner Losh" <[email protected]>
| Newsgroups | gmane.os.freebsd.devel.acpi,gmane.os.freebsd.current,gmane.os.freebsd.devel.mobile |
|---|---|
| Message-ID | <[email protected]> |
In message: <[email protected]> "Paul B. Mahol" <[email protected]> writes: : On 5/4/09, Alexander Motin <[email protected]> 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. It should. If it isn't, that's a bug. Warner