[sane-devel] Two USB attached scanners

[Henning Meier-Geinitz]

Hi,

On Wed, Apr 24, 2002 at 06:28:59PM +0200, Klaas Freitag wrote:
> The problem is that the installer usually writes device filenames and they can
> change. Consider scanner1 on /dev/usb/scanner0 and scanner 2 on
> /dev/usb/scanner1. The installer writes the filenames into the config files. Now
> you remove scanner1. That makes the kernel immediately move scanner2 to
> /dev/usb/scanner0! That is the real problem. The device file changes. That is
> why it was decided only to support one USB scanner with the install tool. Note
> that you can handle one USB and more SCSI scanner, and I think that is more
> usual case having the old SCSI scanner and bought a new cool USB scanner ;).

Ok, this sounds reasonable. Some backends support "usb vendor product"
which avoids these problems. However, this won't work with older Linux
kernels or non-Linux operating systems.

Bye,
  Henning