Mouse Sensitivity

List all input devices:

xinput 

or

xinput list

List properties of a selected input device:

xinput list-props <device-id>

Example:

xinput list-props 268

Set property:

xinput set-prop <device-id> <property> <value>

xinput set-prop 12 268 5.0

Set Speed

This example assumes that you have a notebook with a touchpad.

$> xinput list
 Virtual core pointer                    	id=2	[master pointer  (3)]
   ↳ Virtual core XTEST pointer              	id=4	[slave  pointer  (2)]
   ↳ SynPS/2 Synaptics TouchPad              	id=12	[slave  pointer  (2)]

The touchpad has the id 12.

Listing the properties of the touchpad shows that the property 268 is used for speed.

xinput list-props 12
Device 'SynPS/2 Synaptics TouchPad':
	Device Enabled (141):	1
	Coordinate Transformation Matrix (143):	1.000000, 0.000000, 0.000000, 0.000000, 1.000000, 0.000000, 0.000000, 0.000000, 1.000000
	Device Accel Profile (267):	1
	Device Accel Constant Deceleration (268):	2.500000

The touchpad has a current speed value of 2.5. If we want to make the mouse move more sluggish we need to set a high value like 10.0. If we want a very fast mouse we need to set the value to something like 1.0. Feel free.