Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751425AbWAEWXw (ORCPT ); Thu, 5 Jan 2006 17:23:52 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751444AbWAEWXv (ORCPT ); Thu, 5 Jan 2006 17:23:51 -0500 Received: from gprs189-60.eurotel.cz ([160.218.189.60]:47581 "EHLO amd.ucw.cz") by vger.kernel.org with ESMTP id S1751425AbWAEWXv (ORCPT ); Thu, 5 Jan 2006 17:23:51 -0500 Date: Thu, 5 Jan 2006 23:23:38 +0100 From: Pavel Machek To: Dominik Brodowski , Patrick Mochel , Andrew Morton , Linux-pm mailing list , kernel list Subject: Re: [linux-pm] [patch] pm: fix runtime powermanagement's /sys interface Message-ID: <20060105222338.GG2095@elf.ucw.cz> References: <20051227213439.GA1884@elf.ucw.cz> <20051227220533.GA1914@elf.ucw.cz> <20060104213405.GC1761@elf.ucw.cz> <20060105215528.GF2095@elf.ucw.cz> <20060105221334.GA925@isilmar.linta.de> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20060105221334.GA925@isilmar.linta.de> X-Warning: Reading this can be dangerous to your mental health. User-Agent: Mutt/1.5.9i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1471 Lines: 33 On Čt 05-01-06 23:13:34, Dominik Brodowski wrote: > 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. Well, yes. Two years before we supported hlt, it would be stupid to try to support multiple hlt states. We do not support hlt for any devices today. > In addition, your patch breaks pcmcia / pcmciautils which already uses > numbers (which I already had to change from "3" to "2" before...). pcmcia actually uses this? Ouch. Do you just read the power file, or do you write to it, too? Pavel -- Thanks, Sharp! - 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/