Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1761628AbZJJCDk (ORCPT ); Fri, 9 Oct 2009 22:03:40 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S934432AbZJJCDk (ORCPT ); Fri, 9 Oct 2009 22:03:40 -0400 Received: from netrider.rowland.org ([192.131.102.5]:36285 "HELO netrider.rowland.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S1761174AbZJJCDj (ORCPT ); Fri, 9 Oct 2009 22:03:39 -0400 Date: Fri, 9 Oct 2009 22:03:02 -0400 (EDT) From: Alan Stern X-X-Sender: stern@netrider.rowland.org To: Benjamin Herrenschmidt cc: Greg KH , "linux-kernel@vger.kernel.org" , "linux-usb@vger.kernel.org" , Hugh Blemings , "Rafael J. Wysocki" Subject: Re: USB serial regression 2.6.31.1 -> 2.6.31.2 (and 2.6.32-rc3) In-Reply-To: Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1297 Lines: 32 On Fri, 9 Oct 2009, Alan Stern wrote: > On Sat, 10 Oct 2009, Benjamin Herrenschmidt wrote: > > > (Adding Rafael) > > > > On Sat, 2009-10-10 at 11:31 +1100, Benjamin Herrenschmidt wrote: > > > On Sat, 2009-10-10 at 11:25 +1100, Benjamin Herrenschmidt wrote: > > > > Hi folks ! > > > > > > > > My USB GSM modem (Huawei 169, pretty common stuff) stopped working in > > > > the latest ubuntu karmic update. So far, I tracked it down to a > > > > regression that happened in the stable releases between 2.6.31.1 and > > > > 2.6.31.2 (still present in .3). I haven't tested 2.6.32-rc* yet and > > > > haven't had a chance to bisect (need to make myself a trimmed > > > > down .config first). > This looks a lot like a hardware problem, such as bad USB cables. > Could you collect a usbmon trace for bus 4? It ought to show whether > this is the case or whether software is at fault. If it's not a hardware issue and the modem really does work okay in 2.6.31.1, you should also collect a usbmon trace under that kernel for comparison. Alan Stern -- 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/