hello,
not sure about slack but in debian i used gpm-config to set up the mode in console mode and then X picked up the device.
I use a logitech - which should not matter
your entry differes from mine in that I use a USB mouse and it is device zero...
Code:
Section "InputDevice"
Identifier "Mouse0"
Driver "mouse"
Option "Protocol" "IMPS/2"
Option "Device" "/dev/input/mice"
Option "ZAxisMapping" "4 5"
Option "Emulate3Buttons" "no"
EndSection
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