Date: Mon, 4 May 2009 09:26:37 +0200 From: Hans Petter Selasky <hselasky@c2i.net> To: freebsd-current@freebsd.org Cc: Alexander Motin <mav@freebsd.org>, FreeBSD acpi <freebsd-acpi@freebsd.org>, freebsd-mobile@freebsd.org Subject: Re: Fighting for the power. Message-ID: <200905040926.38337.hselasky@c2i.net> In-Reply-To: <49FE1826.4060000@FreeBSD.org> References: <49FE1826.4060000@FreeBSD.org>
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> 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. The new USB stack should turn off USB HC's automatically when not in use. At least the schedules will get disabled. Did you do any research on this? --HPS
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