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Make sure your xorg.conf has these lines

### Touch Configuration Begin ###
Section "InputDevice"
Identifier "EETI"
Driver "egalax"
Option "Device" "/dev/input/event2"
Option "Parameters" "/var/lib/eeti.param"
Option "ScreenNo" "0"
EndSection
### Touch Configuration End ###

Fuente: http://ubuntuforums.org/showthread.php?p=5434798