I can't remember if it was 10-evdev.conf
Code:
Section "InputClass" Identifier "Marble Mouse" MatchProduct "Logitech USB Trackball" Option "EmulateWheel" "true" Option "EmulateWheelButton" "9" Option "XAxisMapping" "6 7" Option "Emulate3Buttons" "true" EndSection
Code:
Section "InputClass" Identifier "Marble Mouse" MatchProduct "Logitech USB Trackball" Driver "libinput" Option "ScrollMethod" "button" Option "ScrollButton" "9" Option "MiddleEmulation" "on" EndSection
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