From owner-freebsd-acpi@FreeBSD.ORG Mon Dec 13 18:21:25 2004 Return-Path: Delivered-To: freebsd-acpi@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 0D6AE16A4CE for ; Mon, 13 Dec 2004 18:21:25 +0000 (GMT) Received: from www.cryptography.com (li-22.members.linode.com [64.5.53.22]) by mx1.FreeBSD.org (Postfix) with ESMTP id 9F5F043D1D for ; Mon, 13 Dec 2004 18:21:24 +0000 (GMT) (envelope-from nate@root.org) Received: from [10.0.0.34] (adsl-67-119-74-222.dsl.sntc01.pacbell.net [67.119.74.222]) by www.cryptography.com (8.12.8/8.12.8) with ESMTP id iBDILFAm009190 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NOT); Mon, 13 Dec 2004 10:21:20 -0800 Message-ID: <41BDDD93.4020308@root.org> Date: Mon, 13 Dec 2004 10:21:07 -0800 From: Nate Lawson User-Agent: Mozilla Thunderbird 0.9 (Windows/20041103) X-Accept-Language: en-us, en MIME-Version: 1.0 To: Igor Partola References: <41BDD431.1010702@clarku.edu> In-Reply-To: <41BDD431.1010702@clarku.edu> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit cc: freebsd-acpi@freebsd.org Subject: Re: Soundcard powerdown X-BeenThere: freebsd-acpi@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: ACPI and power management development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 13 Dec 2004 18:21:25 -0000 Igor Partola wrote: > Good time of day, > > I found an interesting feature under the Windows installation on my > laptop. It seems that when there is no sound playing the soundcard is > shut off. I'm not sure how much power this would save but it is > interesting that this is possible. Maybe this could appear on a distant > wishlist. That would need to be built into the sound card driver (or snd mid-layer). All it would have to do is call pci_set_powerstate(dev, ...D3) on attach and then set it to D0 before beginning playback. -- Nate