Corsair M95 Gaming Mouse too sensitive / speed too fast. How to reduce speed?
I was super close:
xinput set-prop $MOUSE_ID "libinput Accel Speed" -0.9
Where
MOUSE_ID=`xinput list | grep -i Corsair | awk '{print $(NF-3)}' | cut -c4-5 | head -n 1
Per: https://patrickmn.com/aside/lowering-gaming-mouse-sensitivity-in-ubuntu-9-10/
For those who don't have Device Accel Constant Deceleration like me.
The values for libinput Accel Speed can be negative, e.g.
xinput --set-prop 'pointer:Logitech MX Master' 'libinput Accel Speed' -0.5
To find your mouse name:
xinput | grep pointer, don't forget to prefix it with pointer: as my mouse shows up as a keyboard too.