libsane-1.0.24-alt2.1.M60P.1 In my case (https://bugzilla.altlinux.org/show_bug.cgi?id=28353#c3 ), the device file for the multi-functional (printer and scanner) device is owned by the "lp" group, not by the "scanner" group. So the users who should have access to scanners don't have access to this scanner. The two users of my system are in the "scanner" group, but not in the "lp" group. Should this be considered a bug or not a bug? Is the advice then to add users to the "lp" group? (If ConsoleKit is not enough for what we want.)
See lsattr /dev/<your device> ConsoleKit (old way) or logind should add scanner as group in attribute for logged in Xorg users.
Sorry, getfacl See http://blog.crox.net/archives/64-Scanner-permissions-in-Ubuntu-Karmic-udev-libusb-saned-problem-with-udev-acl.html