Disabling/Enabling the Asus UX303 Touchscreen in Ubuntu 16.04

Find the Atmel touchscreen device:

$ xinput --list
⎡ Virtual core pointer                        id=2    [master pointer  (3)]
⎜   ↳ Virtual core XTEST pointer                      id=4    [slave  pointer  (2)]
⎜   ↳ FocalTechPS/2 FocalTech FocalTech Touchpad      id=17   [slave  pointer  (2)]
⎜   ↳ Logitech USB Optical Mouse                      id=20   [slave  pointer  (2)]
⎜   ↳ Atmel                                           id=10   [slave  pointer  (2)]
⎣ Virtual core keyboard                       id=3    [master keyboard (2)]
    ↳ Virtual core XTEST keyboard                     id=5    [slave  keyboard (3)]
    ↳ Power Button                                    id=6    [slave  keyboard (3)]
    ↳ Sleep Button                                    id=9    [slave  keyboard (3)]
    ↳ USB2.0 UVC HD Webcam                            id=13   [slave  keyboard (3)]
    ↳ Video Bus                                       id=7    [slave  keyboard (3)]
    ↳ AT Translated Set 2 keyboard                    id=16   [slave  keyboard (3)]
    ↳ Video Bus                                       id=8    [slave  keyboard (3)]
    ↳ Asus WMI hotkeys                                id=15   [slave  keyboard (3)]

The Atmel device is our touchscreen.

Use the xinput disable and enable commands to turn the touchscreen off or on again.:

$ xinput disable Atmel
$ xinput enable Atmel

Both commands are silent, unless you specify a device that doesn't exist.