From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S265768AbUJETyW (ORCPT ); Tue, 5 Oct 2004 15:54:22 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S266460AbUJETmN (ORCPT ); Tue, 5 Oct 2004 15:42:13 -0400 Received: from atrey.karlin.mff.cuni.cz ([195.113.31.123]:57753 "EHLO atrey.karlin.mff.cuni.cz") by vger.kernel.org with ESMTP id S266473AbUJETlK (ORCPT ); Tue, 5 Oct 2004 15:41:10 -0400 Date: Tue, 5 Oct 2004 21:32:39 +0200 From: Pavel Machek To: David Brownell Cc: linux-kernel@vger.kernel.org, linux-usb-devel@lists.sourceforge.net Subject: Re: PATCH/RFC: driver model/pmcore wakeup hooks (0/4) Message-ID: <20041005193238.GC4723@openzaurus.ucw.cz> References: <200410041354.37932.david-b@pacbell.net> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <200410041354.37932.david-b@pacbell.net> User-Agent: Mutt/1.3.27i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Hi! > One significant example involves USB mice. If they were to be > suspended (usb_suspend_device) after a few seconds of inactivity, > that change could often spread up the device tree and let the > USB host controller stop DMA access. Some x86 CPUs could > then enter C3 and save a couple Watts of battery power ... until > the mouse moved, and woke that branch of the device tree > for a while (until the mouse went idle again). How fast is the wakeup? Will not that make mouse jump a bit? (Just curious...) Pavel -- 64 bytes from 195.113.31.123: icmp_seq=28 ttl=51 time=448769.1 ms