usb scanner permissions problem
 

I have slackware 12, and epson perfection 1670. Scanner works perfectly on debian/ubuntu/gentoo with non-root users.
Now it works only under root. I thought that problem is in udev, but all setting are ok(I think).

with root:
scanimage -L
device `snapscan:libusb:001:003' is a EPSON EPSON Scanner flatbed scanner

with other users:
No scanners were identified. If you were expecting something different,
check that the scanner is plugged in, turned on and detected by the
sane-find-scanner tool (if appropriate). Please read the documentation
which came with this software (README, FAQ, manpages).

How to make right permissions after pluging in scanner if /etc/udev/rules.d/80-libsane.rules:

ACTION!="add", GOTO="libsane_rules_end"
SUBSYSTEM!="usb_device", GOTO="libsane_rules_end"
# EPSON Perfection 1670 | EPSON Perfection 1670 PHOTO | Epson Perfection 1670
SYSFS{idVendor}=="04b8", SYSFS{idProduct}=="011f", MODE="660", GROUP="scanner"
LABEL="libsane_rules_end"

Are you a member of group "scanner" ? You must be. Check '/etc/group'

yes i'm a member of group scanner, and also plugdev
I can work with scanner only after i do this:
chmod a+rw /proc/bus/usb/001/00.

Then, maybe you could try changing this rule:

Instead of:
put:
or if the above doesn't work,

after changing mode it doesn't work
I tried udevtest to watch what's happening when i reboot
udevtest /class/usb_endpoint/usbdev2.2_ep81/
....
udev_node_add: creating device node '/dev/usbdev2.2_ep81', major=254, minor=11, mode=0660, uid=0, gid=0
....

This is very strange because in /etc/udev/rules.d/80-libsane.rules gid is another (for group scanner)

problem solved
 

I added this line into /etc/udev/rules.d/50-udev-default.rules in libusb section.
SUBSYSTEM=="usb", ATTRS{idProduct}=="011f", GROUP="scanner", MODE="0660"
Now everything works.

I've seen my problem in the internet but i didnt find any solution. It seems to me to be a bug in a description of devices that use libusb.

That's odd. Well, glad to see it worked.