Re: Fighting for the power.

From: Paul B. Mahol <onemda_at_gmail.com>
Date: Mon, 4 May 2009 11:40:35 +0200
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.

-- 
Paul
Received on Mon May 04 2009 - 07:40:42 UTC

This archive was generated by hypermail 2.4.0 : Wed May 19 2021 - 11:39:47 UTC