lkml.org 
[lkml]   [2004]   [Oct]   [14]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [linux-usb-devel] Re: Linux 2.6.x wrongly recognizes USB 2.0 DVD writer
On Thu, 14 Oct 2004, Ganesan R wrote:

> 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:
>
> ========
> /* <torsten.scherer@uni-bielefeld.de>: 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.

Certainly that entry is the problem. It has been removed in the latest
development kernels; it may already be gone in 2.6.9-rc4.

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/

\
 
 \ /
  Last update: 2005-03-22 14:07    [W:0.043 / U:8.368 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site