How to check what input devices are available and to enable or disable devices such as trackpad

Command syntax

# xinput -h

usage :
    xinput get-feedbacks <device name>
    xinput set-ptr-feedback <device name> <threshold> <num> <denom>
    xinput set-integer-feedback <device name> <feedback id> <value>
    xinput get-button-map <device name>
    xinput set-button-map <device name> <map button 1> [<map button 2> [...]]
    xinput set-pointer <device name> [<x index> <y index>]
    xinput set-mode <device name> ABSOLUTE|RELATIVE
    xinput list [--short || --long || --name-only || --id-only] [<device name>...]
    xinput query-state <device name>
    xinput test [-proximity] <device name>
    xinput create-master <id> [<sendCore (dflt:1)>] [<enable (dflt:1)>]
    xinput remove-master <id> [Floating|AttachToMaster (dflt:Floating)] [<returnPointer>] [<returnKeyboard>]
    xinput reattach <id> <master>o
    xinput float <id>
    xinput set-cp <window> <device>
    xinput test-xi2 [--root] <device>
    xinput map-to-output <device> <output name>
    xinput list-props <device> [<device> ...]
    xinput set-int-prop <device> <property> <format (8, 16, 32)> <val> [<val> ...]
    xinput set-float-prop <device> <property> <val> [<val> ...]
    xinput set-atom-prop <device> <property> <val> [<val> ...]
    xinput watch-props <device>
    xinput delete-prop <device> <property>
    xinput set-prop <device> [--type=atom|float|int] [--format=8|16|32] <property> <val> [<val> ...]
    xinput disable <device>
    xinput enable <device>

List input devices

# xinput list

⎡ Virtual core pointer                        id=2    [master pointer (3)]
⎜   ↳ Virtual core XTEST pointer                  id=4    [slave pointer (2)]
⎜   ↳ Microsoft Microsoft® Nano Transceiver v2.0    id=15    [slave pointer (2)]
⎜   ↳ Microsoft Microsoft® Nano Transceiver v2.0    id=16    [slave pointer (2)]
⎜   ↳ PS/2 Elantech Touchpad                      id=11    [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)]
    ↳ Power Button                                id=8    [slave keyboard (3)]
    ↳ HP TrueVision HD                            id=9    [slave keyboard (3)]
    ↳ AT Translated Set 2 keyboard                id=10    [slave keyboard (3)]
    ↳ HP WMI hotkeys                              id=12    [slave keyboard (3)]
    ↳ HP Wireless hotkeys                         id=13    [slave keyboard (3)]
    ↳ Microsoft Microsoft® Nano Transceiver v2.0    id=14    [slave keyboard (3)]

Note the device to disable e.g. your trackpad (highlighted in RED above)

# xinput disable 1

Check "Enabled" property for this device

# xinput list-props 11 | grep Enabled

Device Enabled (137): 0

value of 0 => Disabled

To re-enable

# xinput enable 11

# xinput list-props | grep Enabled

Device Enabled (137): 1