After a long search on the net I've found out
that the permissions of the usb device are set wrong
(root.usb)
It looks like an UDEV rule installed by sane-backends
sets the user to root and the group to usb.
With these settings CUPS won't recognize/use the printer.

I had to add the following rule to /etc/udev/rules.d/10-local.rules
(e.g.)

ATTR{idVendor}=="0482", ATTR{idProduct}=="0015", MODE:="0777",
  GROUP:="lp", USER:="lp", ENV{libsane_matched}:="yes"

where one has to vary the idVendor and idProduct, of course.

Even for a casual Gentoo user that's neither trivial nor comfortable.
If the printer breaks sometime one has to remember to change that rule.
And it wasn't easy to find that advice.

Where should I report a bug to ?
To
net-print/cups
or
media-gfx/sane-backends
or where else?

Thanks for your help,
Helmut.


-- 
Helmut Jarausch

Lehrstuhl fuer Numerische Mathematik
RWTH - Aachen University
D 52056 Aachen, Germany

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