From mboxrd@z Thu Jan 1 00:00:00 1970 From: Pavel Machek Subject: Re: [linux-pm] [patch] pm: fix runtime powermanagement's /sys interface Date: Fri, 6 Jan 2006 17:20:23 +0100 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-Transfer-Encoding: QUOTED-PRINTABLE Return-path: Content-Disposition: inline In-Reply-To: <20060106143414.GA14043@home.tig-grr.com> Sender: linux-kernel-owner@vger.kernel.org To: Tom Marshall Cc: Patrick Mochel , dtor_core@ameritech.net, Andrew Morton , Linux-pm mailing list , kernel list List-Id: linux-pm@vger.kernel.org On P=E1 06-01-06 06:34:14, Tom Marshall wrote: > > > I have a firewire controller in a desktop system, and a ATI Radeo= n in a > > > T42 that support D1 and D2.. > >=20 > > Ok, now we have a concrete example. So Radeon supports D1. But putt= ing > > radeon into D1 means you probably want to blank your screen and tur= n > > the backlight off; that takes *long* time anyway. So you can simply > > put your radeon into D3 and save a bit more power. > >=20 > > So yes, Radeon supports D1, but we probably do not want to use it. >=20 > I understand this is a theoretical argument. However, in reality, a > significant number of T42 owners get less than 12 hours of battery li= fe 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 pat= ch that > will reliably enter D2 (or D3 if it is supported?) for all Radeon 750= 0 > 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 --=20 Thanks, Sharp!