Sane and Epson Perfection 2450 Photo scanner

[Jack Bowling]

On Wed, Apr 11, 2007 at 12:00:19AM -0400, Alex Janssen wrote:
> "sane-find-scanner -v -v" reports:
>     <trying to find out which USB chip is used>
>     ...
>     <Couldn't determine type of USB chip (result from sane-backends 1.0.18)>
> 
> I guess if it can't determine the type of chip, it can't communicate.
> Going to www.linux-usb.org ...
> 
> More later,
> Alex


Alex - If you have a slower speed usb v1.1 bus, plug the scanner into it
and see what happens. Last night I made one last ditch attempt to get my
2450 working and I had success. What I did was:

1) Confirmed that the scanner could only be seen on the v1.1 bus
2) "apt-get remove iscan"

and everything started working. Apparently the epkowa driver installed
by iscan was getting in the way of the sane epson driver somehow. 

I think I know why the ubuntu devs are having a hard time with this one now. Most
people in the threads of this bug have installed the iscan driver from
http://www.avasys.jp at some point in an attempt to get a working
scanner. With all the changes in the various subsystems, it is not
improbable that the two drivers started stepping on each other at some
point. 

Now the fact that the device doesn't work on the usb v2.0 bus is indeed
a bug....

Jack Bowling