Ubuntu: Touch screen Calibration doesn't work for Egalax Driver


I have installed egalax driver on Ubuntu Machine (14.04 LTS). Touch is working fine. But the calibration doesn't work.

When I press Ctrl + C, it selects the eGalaxTouch Virtual device for Single for calibration and calibration screen opens but doesn't able to perform the calibration successfully.

The Xorg logs shows divide by zero errors

The machine is detected three (Multiple) eGalax devices.

Any ideas ideas to fix this problem when there are multiple devices detected.

xinput -list showing as below        root@50:~# xinput -list  ⎡ Virtual core pointer                        id=2    [master pointer  (3)]  ⎜   ↳ Virtual core XTEST pointer              id=4    [slave  pointer  (2)]  ⎜   ↳ eGalaxTouch Virtual Device for Single   id=13    [slave  pointer  (2)]      ↳ eGalax Inc. USB TouchController         id=9     [slave  pointer  (2)]  |   ↳ eGalax Inc. USB TouchController Pen     id=8     [slave  pointer  (2)]|        ⎣ Virtual core keyboard                        id=3    [master keyboard (2)]      ↳ Virtual core XTEST keyboard              id=5    [slave  keyboard (3)]      ↳ CHICONY USB Keyboard                     id=8    [slave  keyboard (3)]      ↳ Power Button                             id=7    [slave  keyboard (3)]      ↳ Power Button                             id=6    [slave  keyboard (3)]        root@50:~# xinput -list-props 13  Device 'eGalaxTouch Virtual Device for Single':          Device Enabled (114):   0    root@50:~# xinput -list-props 9  Device 'eGalax Inc. USB TouchController':          Device Enabled (114):   0    root@50:~# xinput -list-props 8  Device 'eGalax Inc. USB TouchController Pen':          Device Enabled (114):   0  

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