running xsane only possible as root

[Hubertus Hiden]

Hello

I have a CanoScan N640p attached to the parallel port. Xsane works but I 
have to start it as root. If I start it as a normal user xsane can't 
detect the scanner. What I did was to a chmod 666 /dev/lp0 but without 
any effect.
Could anybody please give me hint on where to look ?

Thanks a lot
Hubertus