Xorg Logitech Marble Trackball Config on Debian

50-marblemouse.conf

# put this file under /usr/share/X11/xorg.conf.d/50-marblemouse.conf

# Large button left       : normal click
# Both large buttons      : middle click
# Large button right      : right-click
# Small button left       : browser back
# Small button left+ball  : scroll (verticaly or horizontally)
# Small button right      : browser forward


Section "InputClass"
    Identifier      "Marble Mouse"
    MatchProduct    "Logitech USB Trackball"
    MatchIsPointer  "on"
    MatchDevicePath "/dev/input/event*"
    Driver          "evdev"
    Option          "SendCoreEvents" "true"

    # Option "ButtonMapping"      "1 8 3 4 5 6 7 2 9" # This mapping is tricky
    Option "Buttons"            "9"
    Option "EmulateWheel"       "true"
    Option "EmulateWheelButton" "8 8"
    Option "YAxisMapping"       "4 5"
    Option "XAxisMapping"       "6 7"
    Option "Emulate3Buttons"    "true"
EndSection

Thanks for this ... just what I needed