From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752419AbZBPU3L (ORCPT ); Mon, 16 Feb 2009 15:29:11 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752541AbZBPU2y (ORCPT ); Mon, 16 Feb 2009 15:28:54 -0500 Received: from casper.infradead.org ([85.118.1.10]:40792 "EHLO casper.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751799AbZBPU2x (ORCPT ); Mon, 16 Feb 2009 15:28:53 -0500 Date: Mon, 16 Feb 2009 12:28:30 -0800 From: Arjan van de Ven To: Kyle Moffett Cc: Oliver Neukum , Benjamin Herrenschmidt , "Rafael J. Wysocki" , pm list , LKML , Arve =?UTF-8?B?SGrDuG5uZXbDpWc=?= , Alan Stern , Pavel Machek , Nigel Cunningham , Matthew Garrett , mark gross , "Woodruff, Richard" , Uli Luckas , Igor Stoppa , Brian Swetland , Len Brown Subject: Re: [RFD] Automatic suspend Message-ID: <20090216122830.4096c5b0@infradead.org> In-Reply-To: References: <200902160010.16955.rjw@sisk.pl> <200902160806.17901.oliver@neukum.org> <20090216074048.6d70f17c@infradead.org> <200902161748.09208.oliver@neukum.org> <20090216093108.078aac35@infradead.org> Organization: Intel X-Mailer: Claws Mail 3.7.0 (GTK+ 2.14.7; i386-redhat-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org See http://www.infradead.org/rpr.html Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, 16 Feb 2009 15:08:09 -0500 Kyle Moffett wrote: > I think it would be very useful to have a mechanism for userspace to > find out "Link detection on this NIC costs ~50mW" and "No link has > been detected for the last 15 minutes", so that it can compile all > that sort of information and prompt the user what devices they would > like to disable. Perhaps an "airline mode" sort of thing modes suck... they're very much the wrong concept for power management (but that's a different story) if the user (or something on its behalf) doesn't need link detection, he can turn it off. Really. He doesn't need to know that maybe on machine one this saves some power, and on machine two that power was already mostly saved while on machine three it doesn't save anything at all. Not to mention that the driver is extremely unlikely to know how much actual power will be saved... -- Arjan van de Ven Intel Open Source Technology Centre For development, discussion and tips for power savings, visit http://www.lesswatts.org