gentoo elo touchscreen

[rom]

I have setup the display part of my elo touchscreen:

kernel option: Device Drivers -> Graphics Support -> Console display driver support -> Framebuffer Console Support.

with "lsusb" I see "Bus 001 Device 004:ID 17e9:0211 Displaylink"

Should there be also a second device for the input/touch function?
X video is working fine, but I cannot move the touch cursor (input)..

Any Idea for:
Kernel setting?
howto check if the settings are correct?
xorg.conf settings?

Thanks.