[Gllug] Epson scanner setup

[Mike Brodbelt]

On Sun, 2005-11-20 at 16:27 +0000, Mike Brodbelt wrote:

> I have an Epson Stylus Photo RX620 (all in one device), and I've
> installed the current version of sane in Debian unstable. The
> recommended sane backend for this is the "epkowa" backend, which is part
> of the libsane-extras package.
> 
> Running "sane-find-scanner" gives:-
> 
> <snip>
> found USB scanner (vendor=0x04b8 [EPSON], product=0x0811 [USB2.0 MFP]) at libusb:1:4
>   # Your USB scanner was (probably) detected. It may or may not be supported by
>   # SANE. Try scanimage -L and read the backend's manpage.
> </snip>
> 
> However, "scanimage -L" throws an error with "no scanners identified".


Posting a response to my own problem, in case anyone else hits this.
There's currently a bug in SANE with regard to multifunction devices:-

https://alioth.debian.org/tracker/index.php?func=detail&aid=302207&group_id=30186&atid=410366

So, sane-find-scanner works for me, but scanimage -L fails to see a
valid scanner. The clue is in the dmesg output:-

usb 1-1.4: usbfs: interface 1 claimed by usblp while 'scanimage' sets config #1

Basically the first "driver" to talk to the device has to set the usb
configuration, and SANE tries to do that. In the case of a multifunction
device which has already been configured by (in this case) the usblp
module, the attempt to set the configuration fails, so SANE never sees
the device. Apparently this has been fixed in the CVS version now - in
the meantime removing the usblp module is a functional work around.

Mike

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