Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1750845AbWAEWNh (ORCPT ); Thu, 5 Jan 2006 17:13:37 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751819AbWAEWNh (ORCPT ); Thu, 5 Jan 2006 17:13:37 -0500 Received: from isilmar.linta.de ([213.239.214.66]:26796 "EHLO linta.de") by vger.kernel.org with ESMTP id S1750878AbWAEWNg (ORCPT ); Thu, 5 Jan 2006 17:13:36 -0500 Date: Thu, 5 Jan 2006 23:13:34 +0100 From: Dominik Brodowski To: Pavel Machek Cc: Patrick Mochel , Andrew Morton , Linux-pm mailing list , kernel list Subject: Re: [linux-pm] [patch] pm: fix runtime powermanagement's /sys interface Message-ID: <20060105221334.GA925@isilmar.linta.de> Mail-Followup-To: Dominik Brodowski , Pavel Machek , Patrick Mochel , Andrew Morton , Linux-pm mailing list , kernel list References: <20051227213439.GA1884@elf.ucw.cz> <20051227220533.GA1914@elf.ucw.cz> <20060104213405.GC1761@elf.ucw.cz> <20060105215528.GF2095@elf.ucw.cz> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20060105215528.GF2095@elf.ucw.cz> User-Agent: Mutt/1.5.9i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1121 Lines: 23 On Thu, Jan 05, 2006 at 10:55:29PM +0100, Pavel Machek wrote: > > I have a firewire controller in a desktop system, and a ATI Radeon in a > > T42 that support D1 and D2.. > > Ok, now we have a concrete example. So Radeon supports D1. But putting > radeon into D1 means you probably want to blank your screen and turn > the backlight off; that takes *long* time anyway. So you can simply > put your radeon into D3 and save a bit more power. Using your logic, you never want to put your CPU into C2 power-saving state instead of C3 or C4. Which is ridiculous. There are technical reasons why you want to put devices into different power-saving states. E.g. wakeup latency, ability to receive wakeup signals, snooping and so on. In addition, your patch breaks pcmcia / pcmciautils which already uses numbers (which I already had to change from "3" to "2" before...). Dominik - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/