See - Mouse Too Wild?
First, in a terminal, use xinput to find the ‘name’ of your touchpad:
See below for xinput from my old laptop:
⎡ Virtual core pointer id=2 [master pointer (3)]
⎜ ↳ Virtual core XTEST pointer id=4 [slave pointer (2)]
⎜ ↳ AlpsPS/2 ALPS DualPoint TouchPad id=12 [slave pointer (2)]
⎜ ↳ DualPoint Stick id=13 [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)]
↳ Sleep Button id=9 [slave keyboard (3)]
↳ Laptop_Integrated_Webcam_HD id=10 [slave keyboard (3)]
↳ AT Translated Set 2 keyboard id=11 [slave keyboard (3)]
↳ Dell WMI hotkeys id=14 [slave keyboard (3)]
Mine is called “AlpsPS/2 ALPS DualPoint TouchPad” but yours is likely different and you need it exactly. You can use its ID “12” for quick testing but it may change on the next session so don’t rely on it. (I used the touchpad id #)
xinput set-prop “DELL DELL USB Laser Mouse” “Device Accel Constant Deceleration” 2 (the guy in the reference post has a laser mouse)
Note that a value of 2 is for 1/2, 3 for 1/3, 4 for 1/4, etc. The higher the number the more it slows the mouse down. Try 3 or 4 or 5 if you need even more. I use about 3.
Got the value you like for the xinput command? Want to make it permanent? Place the xinput command in your Startup Applications and it’ll run every boot.
Good luck divvykev.