Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757966Ab0HJUhh (ORCPT ); Tue, 10 Aug 2010 16:37:37 -0400 Received: from cantor.suse.de ([195.135.220.2]:39361 "EHLO mx1.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757843Ab0HJUhf (ORCPT ); Tue, 10 Aug 2010 16:37:35 -0400 Date: Tue, 10 Aug 2010 13:34:59 -0700 From: Greg KH To: Dhaval Giani Cc: LKML Subject: Re: USB device getting different product ids Message-ID: <20100810203458.GA24808@suse.de> References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.20 (2009-06-14) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1832 Lines: 43 On Tue, Aug 10, 2010 at 05:08:00PM +0200, Dhaval Giani wrote: > Heya, > > Admittedly I am using an older kernel, but I was wondering if a USB > device can get different product ids on being plugged in at different > times. I have one of these nice USB modems to connect to the internet > . It is one of these huawei devices. Now, most of the times, it gets > detected with vendor id 0x12d1 and product id 0x1446. In this mode, on > loading the usbserial module, I see only ttyUSB0 come up, which for > whatever reason, I am unable to use to connect to the internet. > However when it is detected as the product id 0x140b, I get > ttyUSB[0-2] which then connects very nicely via both wvdial and > networkmanager to the internet. Now obviously, I would like for the > device to get detected as 0x140b each time, as opposed to me pulling > it out and inserting it back in till does get detected as 0x140b :-). > > So my question is, > > 1. Is it possible for the same device to get different product ids at > different times Yes, it's quite common for some devices to do this. > 2. If so, how do I possibly get it to detect the id I want, as opposed > to playing a game of chance. Look at the usb-modeswitch program, it's what you want to control this. > (I would copy linux-usb if I knew the mailing list id, but as I am on > a slow GPRS connection, which is quite flaky right now, I would like > to send this out right now. Please copy that list if it would help!) In the future, it's the linux-usb@vger.kernel.org list, also available in the MAINTAINERS file. thanks, greg k-h -- 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/