Date: Mon, 4 May 2009 11:40:35 +0200 From: "Paul B. Mahol" <onemda@gmail.com> To: Alexander Motin <mav@freebsd.org> Cc: FreeBSD acpi <freebsd-acpi@freebsd.org>, FreeBSD-Current <freebsd-current@freebsd.org>, freebsd-mobile@freebsd.org Subject: Re: Fighting for the power. Message-ID: <3a142e750905040240g58152e69p6fcb797a5e026426@mail.gmail.com> In-Reply-To: <49FE1826.4060000@FreeBSD.org> References: <49FE1826.4060000@FreeBSD.org>
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On 5/4/09, Alexander Motin <mav@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
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