Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751575AbWAFQU7 (ORCPT ); Fri, 6 Jan 2006 11:20:59 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932350AbWAFQU7 (ORCPT ); Fri, 6 Jan 2006 11:20:59 -0500 Received: from gprs189-60.eurotel.cz ([160.218.189.60]:24231 "EHLO amd.ucw.cz") by vger.kernel.org with ESMTP id S1751577AbWAFQU6 (ORCPT ); Fri, 6 Jan 2006 11:20:58 -0500 Date: Fri, 6 Jan 2006 17:20:23 +0100 From: Pavel Machek To: Tom Marshall Cc: Patrick Mochel , dtor_core@ameritech.net, Andrew Morton , Linux-pm mailing list , kernel list Subject: Re: [linux-pm] [patch] pm: fix runtime powermanagement's /sys interface Message-ID: <20060106162023.GA12190@elf.ucw.cz> References: <20051227213439.GA1884@elf.ucw.cz> <20051227220533.GA1914@elf.ucw.cz> <20060104213405.GC1761@elf.ucw.cz> <20060105215528.GF2095@elf.ucw.cz> <20060106143414.GA14043@home.tig-grr.com> Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20060106143414.GA14043@home.tig-grr.com> 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: 1640 Lines: 33 On P? 06-01-06 06:34:14, Tom Marshall 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. > > > > So yes, Radeon supports D1, but we probably do not want to use it. > > I understand this is a theoretical argument. However, in reality, a > significant number of T42 owners get less than 12 hours of battery life in > S3 suspend because the Radeon chip sucks a huge amount of power with the > current code. We would be eternally grateful if someone could figure out > why only some models are affected and, more importantly, submit a patch that > will reliably enter D2 (or D3 if it is supported?) for all Radeon 7500 > chips. I've found a couple patches that were submitted to this list but, > for whatever reason, nobody seems to have found a solution that is > acceptable yet. I've been manually patching my kernels with code to enter > D2 for the last year or so, and from the volume of google results, it looks > like quite a lot of other folks are doing the same... :( We were talking runtime pm here. 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/