Printer working under Ubuntu, but not under Archlinux

[David G]

I recently bought an Epson Stylus SX415.
Ubuntu and Archlinux detects it as an Epson Stylus SX410.
It works Out of the box with Ubuntu 10.10, while I can't get it working under Archlinux.
Theses two distributions have the same version of cups & Gutenprint (5.2.6)
Under Ubuntu, I checked, and Cups use the Gutenprint driver, and not the epson-escpr.

Could you help me please ?

Thank you