Had some trouble setting up the TTX touch screen (which uses an eGalax touch sensor). It seemed to be plug and play (it uses USB connection) but the x-axis was flipped. Luckily I found this handy post:

http://ubuntuforums.org/showthread.php?t=1225205

Short instructions:

  • edit /usr/share/hal/fdi/policy/20thirdparty/50-eGalax.fdi and add a “merge key” line with the others like this:
    <merge key=”input.x11_options.SwapX” type=”string”>1</merge>
  • run Administrator -> Calibrate Touchscreen
  • hit Enter, then tap the X’s, but swap the left and right. That is, tap them in this order:
    • top right
    • top center
    • top left
    • middle right
    • middle center
    • middle left
    • bottom right
    • bottom center
    • bottom left
  • Restart and it should work!