Adjust Touchpad Sensitivity
Determine device number (see above)
xinput list
Open a separate terminal to watch emitted events:
Replace [device number] with the number of your touchpad from 'xinput list'. It will probably be one of the devices under "Virtual core pointer".
This step is not mandatory but it can help to track problems:
xinput --test [device number]
If text flies by as you move your mouse pointer using the touchpad, you know that you got the correct device number.
Open another terminal to see current settings: (Again this step can be omitted but is helpful to see available options. Watch for "Synaptics Finger". It will change as soon as you apply the next command.)
xinput --watch-props [device number]
Set sensitivity:
xinput --set-prop [device number] "Synaptics Finger" 50 80 257
The terminal running 'xinput --watch-props' should now display
Property 'Synaptics Finger' changed.
Synaptics Finger (267): 50, 80, 257
The higher you set the numbers the more force is needed to make an event fire. And the less sensitive the touchpad get.
Source: https://help.ubuntu.com/community/SynapticsTouchpad
And.
The property "Synaptics Finger" can affect the touchpad sensitivity. If you look at your values:
Synaptics Finger (278): 12, 15, 128
The 278 is the id # of the property and the three numbers after it are the values for FingerLow, FingerHigh, and FingerPress.
You can read about these properties in the link below:
http://www.x.org/archive/X11R7.5/doc/man/man4/synaptics.4.html
FingerHigh must always be higher than FingerLow. Start by increasing the values of FingerLow and FingerHigh two points at a
time with this command:
xinput --set-prop "AlpsPS/2 ALPS DualPoint TouchPad" 278 14 17 128
Sometimes using the name of the touchpad doesn't work in the command, so the id # number you previously obtained must be used,
substituting it for the X below:
xinput --set-prop X 278 14 17 128
The command should go into effect immediately, so you can test the touchpad.
Then try: xinput --set-prop X 278 16 19 128
and continue increasing the values of FingerLow and FingerHigh until the problem is resolved, but once you get to around 35 to 40, then
going any highter probably won't help. For a Synaptics touchpad you may be able to go higher. If you go too high then some other
function of the toughpad may not work. Any changes made will only last for one session but right now we're just trying to see if this method
works.
To make the changes permanent, first open the file 50-synaptics.conf
Add the following two lines to the first section named: Section "InputClass"
Replace the "Y" and "Z" in the lines with the values you got from testing:
Option "FingerLow" "Y"
Option "FingerHigh" "Z"
