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The Marble mouse from Logitech does not have an ordinary scroll wheel. Scrolling can be achieved by using the small left button together with the marble.
xinput set-button-map "Logitech USB Trackball" 1 8 3 4 5 6 7 2 9 xinput set-int-prop "Logitech USB Trackball" "Evdev Wheel Emulation Button" 8 8 xinput set-int-prop "Logitech USB Trackball" "Evdev Wheel Emulation" 8 1 xinput set-int-prop "Logitech USB Trackball" "Evdev Wheel Emulation X Axis" 8 6