From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1750851AbWFALma (ORCPT ); Thu, 1 Jun 2006 07:42:30 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1750858AbWFALma (ORCPT ); Thu, 1 Jun 2006 07:42:30 -0400 Received: from mta07-winn.ispmail.ntl.com ([81.103.221.47]:36605 "EHLO mtaout01-winn.ispmail.ntl.com") by vger.kernel.org with ESMTP id S1750844AbWFALma (ORCPT ); Thu, 1 Jun 2006 07:42:30 -0400 Message-ID: <447ED2A4.4030202@gentoo.org> Date: Thu, 01 Jun 2006 12:42:28 +0100 From: Daniel Drake User-Agent: Thunderbird 1.5.0.2 (X11/20060509) MIME-Version: 1.0 To: Andrew Morton CC: David Liontooth , linux-kernel@vger.kernel.org, linux-usb-devel@lists.sourceforge.net, Alan Stern Subject: Re: USB devices fail unnecessarily on unpowered hubs References: <447EB0DC.4040203@cogweb.net> <20060601030140.172239b0.akpm@osdl.org> In-Reply-To: <20060601030140.172239b0.akpm@osdl.org> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Andrew Morton wrote: > (added linux-usb cc) > > Yes, it sounds like we're being non-real-worldly here. This change > apparently broke things. Did it actually fix anything as well? Gentoo recieved several reports of this. It appears that certain vendors are worse than others (Verbatim flash drives are a common culprit). Some users tested and found that Windows has the same behaviour - it rejects these devices on unpowered hubs, and pops up a warning that not enough power is available. I added a printk to point out when configurations are rejected due to power issues, this has been merged into Greg's tree. It's far from ideal, but better than silent failure... Daniel