From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751304AbVHLXOI (ORCPT ); Fri, 12 Aug 2005 19:14:08 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751306AbVHLXOI (ORCPT ); Fri, 12 Aug 2005 19:14:08 -0400 Received: from gateway-1237.mvista.com ([12.44.186.158]:28149 "EHLO av.mvista.com") by vger.kernel.org with ESMTP id S1751304AbVHLXOH (ORCPT ); Fri, 12 Aug 2005 19:14:07 -0400 Message-ID: <42FD2D18.6080302@mvista.com> Date: Fri, 12 Aug 2005 16:13:28 -0700 From: Todd Poynor User-Agent: Mozilla Thunderbird 1.0+ (X11/20050531) MIME-Version: 1.0 To: Jordan Crouse CC: Dave Jones , Bruno Ducrot , Pavel Machek , cpufreq@lists.linux.org.uk, linux-kernel@vger.kernel.org, linux-pm@lists.osdl.org Subject: Re: PowerOP 2/3: Intel Centrino support References: <20050809025419.GC25064@slurryseal.ddns.mvista.com> <20050810100133.GA1945@elf.ucw.cz> <20050810125848.GM852@poupinou.org> <20050810184445.GB14350@redhat.com> <42FA8FC0.5000700@mvista.com> <20050811150650.GG26524@cosmic.amd.com> In-Reply-To: <20050811150650.GG26524@cosmic.amd.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Jordan Crouse wrote: > When it comes > to embedded power management concepts, a consistant theme is that people > often question the usefulness, redundancy or complexity of a solution. This > is perfectly understandable, since such a huge majority of the power > management experts and users are concentrating intently on x86 desktops and > servers. It also occurs to me that another reason for the disconnect between x86 desktop/server and embedded on this point is the lack of ACPI. We want to do things analogous to the power management performed by ACPI, but entirely in Linux, so we need to expose some of those low-level machine resources to our power management software. In many cases those power management decisions do not revolve around the question of the MHz at which the CPU is to run. Embedded Linux system power management exists for many of the same reasons ACPI exists. -- Todd