I use ubuntu 12.04
I have samsung scx-4828fn scaning and printing device. Printing works fine. Scanning works only with sudo. Also sane-find-scanner works only with sudo. Please see output:
found USB scanner (vendor=0x04e8 [Samsung Electronics Co., Ltd.], product=0x342d [SCX-4x28 Series]) at libusb:001:005
My "user" belongs to groups: "lp", "scanner" and also "saned".
Please look output of groups "user":
"user" : "user" adm lp dialout cdrom plugdev scanner lpadmin admin saned sambashare
It is not possible to run simple-scan or xsane as a normal user.