[arch-general] Scanner only works as root

Hello, I have an HP Photosmart C3180 all-in-one (printer/scanner/copier). Installed cups, hplip, sane. Printing works. Scanning, however, only works as root, otherwise xsane says that there are no devices. But if I chmod 777 -R /dev/bus/usb/* it works for my current user; therefore I deduce it is a permission problem. This looks like an udev problem, however my udev knowledge is next to null. What steps could I take to solve this problem? I would like to get rid of this ugly hack. Thanks. -- Renan Birck ~ Canoas, RS, Brasil "Quando tudo que você tem é um martelo, todos os seus problemas se parecem com os seus dedões."