Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S264648AbUJNN2i (ORCPT ); Thu, 14 Oct 2004 09:28:38 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S264668AbUJNN2i (ORCPT ); Thu, 14 Oct 2004 09:28:38 -0400 Received: from sj-iport-2-in.cisco.com ([171.71.176.71]:58926 "EHLO sj-iport-2.cisco.com") by vger.kernel.org with ESMTP id S264648AbUJNN2f (ORCPT ); Thu, 14 Oct 2004 09:28:35 -0400 Message-ID: <416E7E39.4040102@myrealbox.com> Date: Thu, 14 Oct 2004 18:55:13 +0530 From: Ganesan R User-Agent: Mozilla Thunderbird 0.8 (X11/20040918) X-Accept-Language: en-us, en MIME-Version: 1.0 To: John Stoffel CC: linux-kernel@vger.kernel.org, linux-usb-devel@lists.sourceforge.net, torsten.scherer@uni-bielefeld.de Subject: Re: Linux 2.6.x wrongly recognizes USB 2.0 DVD writer References: <16750.30914.666243.108593@gargle.gargle.HOWL> In-Reply-To: <16750.30914.666243.108593@gargle.gargle.HOWL> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2801 Lines: 67 John Stoffel wrote: >Ganesan> I have a NEC ND-2500A DVD writer in a ByteCC USB 2.0 external >Ganesan> enclosure. It's recognized perfectly in 2.4.27 (Debian >Ganesan> kernel-image-2.4.27-1-686 package) > >I've got a ByteCC external enclosure too, and I can't get it to work >reliably under Linux or Windows under Firewire. I'd return it and get >something better. > Thanks for the info. As I mentioned, the enclosure works flawlessly for me under 2.4.27. It's getting detected incorrectly only in 2.6.x. Another user reported a similar problem but was able to get dvd burning working by removing the checks from the writing tool. So, it looks like detection has been messed up only in 2.6.x. Once again, 2.6.8 reports it as ====== scsi3 : SCSI emulation for USB Mass Storage devices Vendor: Revoltec Model: USB/IDE Bridge ( Rev: 0103 Type: Direct-Access ANSI SCSI revision: 02 Attached scsi removable disk sdb at scsi3, channel 0, id 0, lun 0 ====== whereas 2.4.27 correctly reports ======== scsi2 : SCSI emulation for USB Mass Storage Vendor: _NEC Model: DVD_RW ND-2500A Type: CD-ROM ANSI SCSI revision: 02 Attached scsi CD-ROM sr1 at scsi2, channel 0, id 0, lun 0 sr1: scsi-1 drive USB Mass Storage support registered. ======== I checked the kernel sources. Sure enough, drivers/usb/storage/unusual_devs.h has a new entry in the 2.6 tree: ======== /* : I don't know the name of the bridge * manufacturer, but I've got an external USB drive by the Revoltec company * that needs this. otherwise the drive is recognized as /dev/sda, but any * access to it blocks indefinitely. */ UNUSUAL_DEV( 0x0402, 0x5621, 0x0103, 0x0103, "Revoltec", "USB/IDE Bridge (ATA/ATAPI)", US_SC_DEVICE, US_PR_DEVICE, NULL, US_FL_FIX_INQUIRY), ======== I have not yet tested after removing this entry, but this looks to be the likely problem. The enclosure actually supports both 3.5 IDE hard disks as well as 5.25 CD/DVD drives. I have no clue why this entry should cause the drive to be wrongly detected. CCing linux-usb-devel for help. Please CC me on replies to linux-usb-devel since I am not subscribed to that list. Thanks. Ganesan - 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/