Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1761981AbXHCMEn (ORCPT ); Fri, 3 Aug 2007 08:04:43 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752868AbXHCMEg (ORCPT ); Fri, 3 Aug 2007 08:04:36 -0400 Received: from 78-32-9-130.no-dns-yet.enta.net ([78.32.9.130]:52290 "EHLO vavatch.codon.org.uk" rhost-flags-OK-FAIL-OK-OK) by vger.kernel.org with ESMTP id S1752269AbXHCMEf (ORCPT ); Fri, 3 Aug 2007 08:04:35 -0400 Date: Fri, 3 Aug 2007 13:04:18 +0100 From: Matthew Garrett To: Oliver Neukum Cc: linux-usb-devel@lists.sourceforge.net, David Brownell , Greg KH , Alan Stern , linux-kernel@vger.kernel.org Message-ID: <20070803120418.GB16802@srcf.ucam.org> References: <200708022301.08719.david-b@pacbell.net> <20070803112824.GA16802@srcf.ucam.org> <200708031344.03282.oliver@neukum.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <200708031344.03282.oliver@neukum.org> User-Agent: Mutt/1.5.12-2006-07-14 X-SA-Exim-Connect-IP: X-SA-Exim-Mail-From: mjg59@codon.org.uk Subject: Re: [linux-usb-devel] [PATCH] USB: Only enable autosuspend by default on certain device classes X-SA-Exim-Version: 4.2.1 (built Tue, 20 Jun 2006 01:35:45 +0000) X-SA-Exim-Scanned: Yes (on vavatch.codon.org.uk) Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1112 Lines: 24 On Fri, Aug 03, 2007 at 01:44:02PM +0200, Oliver Neukum wrote: > Am Freitag 03 August 2007 schrieb Matthew Garrett: > > It's certainly possible to do that, but it's also possible to have a > > userspace solution that whitelists devices. The question is whether the > > default kernel behaviour should be "Save power, but potentially break > > some of my devices" or "Don't break my devices, but use some more > > powre". > > If both options have drawbacks, IMHO we follow the standard, which > says that devices must support suspension. Except that lots of hardware doesn't follow the standard in this respect, otherwise we wouldn't be having this discussion. Personally, I think "Will break an unknown number of devices" is a significantly larger drawback than "Will consume a small quantity of additional power". -- Matthew Garrett | mjg59@srcf.ucam.org - 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/