Solved: eGalax Touch Screen issues with JavaFX (on Raspberry Pi)

In a former post I wrote about my trouble getting touch support up an running with my eGalax Touch Display, JavaFX and the Raspberry Pi.
Today Simon gave me a hint how he solved that touch event issues with JavaFX.

Many Kudos to Simon Ritter (@speakjava)!

The Clue

It turns out that the screen driver actually creates two event devices in /dev/input: event0 and event1. JavaFX sees /dev/input/event0 and assumes that events come from that, but for some unknown reason no events are actually sent: they all go to /dev/input/event1.

The Cure

Recreate /dev/input/event0 with the same device as /dev/input/event1, so JavaFX gets the information it needs:

eGalax_patch1

Make it suitability for daily usage

Create an init-script to apply the patch at start-up:
Required-Start: $all‘ tells insserv to start the script after all the other scripts, at the end of the boot sequence:

#! /bin/sh
### BEGIN INIT INFO
# Provides:          egalax-patch
# Required-Start:    $all
# Required-Stop:     
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Short-Description:
# Description:       Recreates event0 with the same device as event1, so JavaFX gets the information it needs.
### END INIT INFO

. /lib/lsb/init-functions

rm -f /dev/input/event0
mknod /dev/input/event0 c 13 65

log_success_msg "eGalax Touch Screen patch for JavaFX applied."

You can load it here.

  • copy the script to /etc/init.d/
  • make sure it’s executable: sudo chmod 755 egalax_patch
  • then enable the script: sudo insserv egalax-patch

One last thing

The event devices are re-created by the driver when the USB connection was interrupted.
In this case you will have to reboot the Raspi or (much better) execute the script manually:

eGalax_patch2