How to change mouse speed/sensitivity?

First we need to identify the input device ID to change the speed/sensitivity. Open a terminal and run this command:

xinput --list --short

output:

abcd@abcd-abcde:~$ xinput --list --short

Virtual core pointer

↳ SynPS/2 Synaptics TouchPad                id=11   [slave  pointer  (2)]

↳ Logitech USB RECEIVER                     id=12   [slave  pointer  (2)]

My pointing devices are a Logitech USB RECEIVER and a Synaptics TouchPad. To list out device properties:

xinput --list-props "SynPS/2 Synaptics TouchPad"

EDIT:

Another option: xinput --list-props 11 as 11 is the number that is shown above in its parent property (SynPS/2 Synaptic TouchPad).

Now reduce it's property values to suit your need:

Device Accel Constant Deceleration (267):   2.500000

using this command:

xinput --set-prop "SynPS/2 Synaptics TouchPad" "Device Accel Constant Deceleration" 1.5

EDIT:

Another option: xinput --set-prop 11 267 1.5 where 11 is the device, just like from above, 267 is the id of the device property (Device Accel Constant Decleration) as you can see when device 11 is being listed all of properties being attached, and finally 1.5 is your desired speed.

You may have to play around with this number a bit to set it exactly as you need.

If you need to set this value automatically every time Ubuntu starts then:

create a .sh file

#!/bin/sh

xinput --set-prop "SynPS/2 Synaptics TouchPad" "Device Accel Constant Deceleration" 1.5

change the file to executable :

chmod +x

and Put this in the start-up applications list.

Source : Configuring Mouse Speed manually

Ubuntu 12.10 64-bit, Logitech cordless TrackMan

xinput did nothing for me.

xset q

to check settings

xset mouse 3 0

This sets the acceleration to 3 and the threshold to zero. Not great settings but better than before.

If you want to use fractional value, you can enter fraction (i.e. 3/2) instead of floating point number.

The man page says the settings will be lost on logout/reboot.

The above mentioned "Device Accel ..." options do not exist on my machine. Lenovo T440s running Ubuntu 18.04

Instead, I have success using these:

xinput --set-prop "TPPS/2 IBM TrackPoint" "Coordinate Transformation Matrix" 0.5 0 0 0 0.5 0 0 0 1

The original "Coordinate Transformation Matrix was 1 0 0 0 1 0 0 0 1 and I have now half the speed, which is slow enough for me.

With this syntax, we can adjust horizontal and vertical speed separately.