1. Determine the device id
$ xinput list
⎡ Virtual core pointer id=2 [master pointer (3)]
⎜ ↳ Virtual core XTEST pointer id=4 [slave pointer (2)]
⎜ ↳ Logitech Wireless Mouse id=9 [slave pointer (2)]
⎜ ↳ SynPS/2 Synaptics TouchPad id=12 [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)]
↳ Video Bus id=7 [slave keyboard (3)]
↳ Sleep Button id=8 [slave keyboard (3)]
↳ HP HD Webcam [Fixed]: HP HD Web id=10 [slave keyboard (3)]
↳ AT Translated Set 2 keyboard id=11 [slave keyboard (3)]
↳ HP WMI hotkeys id=13 [slave keyboard (3)]
2. Disable touchpad
$ xinput set-prop 12 "Device Enabled" 0
3. Enable touchpad
$ xinput set-prop 12 "Device Enabled" 1
https://help.ubuntu.com/community/SynapticsTouchpad
SynapticsTouchpad - Community Help Wiki
Introduction A touchpad, and clickpad is a built-in input device for laptops that is used as a computer mouse. Synaptics is a driver for these. Default clickpad gestures The default gestures are: Single finger press on the top 80% of the clickpad surface =
help.ubuntu.com
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