Hi. I confirm that Julien's patch is efficient on Samsung RC510. I have no problems anymore : one, two and three fingers are working, "wheels" too ! In gpointing-device-settings, I see now my touchpad like a touchpad, BUT changes have no effect... it's borring, but modifications in xorg.conf work. :) I have just to find how I can disable the touchpad when the keyboard is used, and I'll happy. Thanks a lot to everyone :)