Date: Mon, 04 May 2009 12:51:05 +0300 From: Alexander Motin <mav@FreeBSD.org> To: "Paul B. Mahol" <onemda@gmail.com> 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: <49FEBA89.4040609@FreeBSD.org> In-Reply-To: <3a142e750905040240g58152e69p6fcb797a5e026426@mail.gmail.com> References: <49FE1826.4060000@FreeBSD.org> <3a142e750905040240g58152e69p6fcb797a5e026426@mail.gmail.com>
next in thread | previous in thread | raw e-mail | index | archive | help
Paul B. Mahol wrote: > 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. Yes. Resume also does not powers down unowned devices. Would be good to fix that also. -- Alexander Motin
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?49FEBA89.4040609>