"Upgraded" 16.04 to 17.04 Now unable to change mouse speed

Question

THE SLIDER DOES NOT WORK! THE FUNDAMENTAL SLIDER THAT'S SUPPOSED TO WORK... DOES NOT WORK!

xset m 

Does NOT work

---

Mouse dump

mantis@toboggan:~$ xinput --list-props 10

Device 'Razer Razer Abyssus':
Device Enabled (143):   1
Coordinate Transformation Matrix (145): 1.000000, 0.000000, 0.000000, 0.000000, 1.000000, 0.000000, 0.000000, 0.000000, 1.000000
libinput Accel Speed (277): 0.000000
libinput Accel Speed Default (278): 0.000000
libinput Accel Profiles Available (279):    1, 1
libinput Accel Profile Enabled (280):   1, 0
libinput Accel Profile Enabled Default (281):   1, 0
libinput Natural Scrolling Enabled (282):   0
libinput Natural Scrolling Enabled Default (283):   0
libinput Send Events Modes Available (262): 1, 0
libinput Send Events Mode Enabled (263):    0, 0
libinput Send Events Mode Enabled Default (264):    0, 0
libinput Left Handed Enabled (284): 0
libinput Left Handed Enabled Default (285): 0
libinput Scroll Methods Available (286):    0, 0, 1
libinput Scroll Method Enabled (287):   0, 0, 0
libinput Scroll Method Enabled Default (288):   0, 0, 0
libinput Button Scrolling Button (289): 2
libinput Button Scrolling Button Default (290): 2
libinput Middle Emulation Enabled (291):    0
libinput Middle Emulation Enabled Default (292):    0
Device Node (265):  "/dev/input/event4"
Device Product ID (266):    5426, 66
libinput Drag Lock Buttons (293):   <no items>
libinput Horizontal Scroll Enabled (294):   1

Yeah, no Constant Deceleration here!

Answer 1

I had the same problem and struggled for quite a while until finding the solution. Most other tutorials tell you to set the property "Device Accel Constant Deceleration".

However, my mouse and as it seems yours too uses libinput.

So the property is a bit different and is called "libinput Accel Speed" https://www.mankier.com/4/libinput

Try setting the speed with the following command:

xinput --set-prop 10 'libinput Accel Speed' -0.8

NB: The values are betwean -1 and 1