Kensington Orbit Trackball Mouse with Scroll Ring ((K72337US) on Ubuntu 15.10

51-kensington.conf

Section "InputClass"
        Identifier "Trackball with Middle Button Emulation"
        MatchProduct "Primax Kensington Eagle Trackball"
	MatchIsPointer "on"
	MatchDevicePath "/dev/input/event*"
        Driver "evdev"
	Option "Emulate3Buttons" "True"
EndSection

Xorg.0.log-after

[  2923.198] (II) config/udev: Adding input device Primax Kensington Eagle Trackball (/dev/input/event2)
[  2923.198] (**) Primax Kensington Eagle Trackball: Applying InputClass "evdev pointer catchall"
[  2923.198] (**) Primax Kensington Eagle Trackball: Applying InputClass "Trackball with Middle Button Emulation"
[  2923.198] (II) Using input driver 'evdev' for 'Primax Kensington Eagle Trackball'
[  2923.198] (**) Primax Kensington Eagle Trackball: always reports core events
[  2923.198] (**) evdev: Primax Kensington Eagle Trackball: Device: "/dev/input/event2"
[  2923.252] (--) evdev: Primax Kensington Eagle Trackball: Vendor 0x47d Product 0x2048
[  2923.252] (--) evdev: Primax Kensington Eagle Trackball: Found 3 mouse buttons
[  2923.252] (--) evdev: Primax Kensington Eagle Trackball: Found scroll wheel(s)
[  2923.252] (--) evdev: Primax Kensington Eagle Trackball: Found relative axes
[  2923.252] (--) evdev: Primax Kensington Eagle Trackball: Found x and y relative axes
[  2923.252] (--) evdev: Primax Kensington Eagle Trackball: Found absolute axes
[  2923.252] (II) evdev: Primax Kensington Eagle Trackball: Forcing absolute x/y axes to exist.
[  2923.252] (II) evdev: Primax Kensington Eagle Trackball: Configuring as mouse
[  2923.252] (II) evdev: Primax Kensington Eagle Trackball: Adding scrollwheel support
[  2923.252] (**) Option "Emulate3Buttons" "True"
[  2923.252] (**) evdev: Primax Kensington Eagle Trackball: YAxisMapping: buttons 4 and 5
[  2923.252] (**) evdev: Primax Kensington Eagle Trackball: EmulateWheelButton: 4, EmulateWheelInertia: 10, EmulateWheelTimeout: 200
[  2923.252] (**) Option "config_info" "udev:/sys/devices/pci0000:00/0000:00:12.0/usb3/3-1/3-1:1.0/0003:047D:2048.0001/input/input5/event2"
[  2923.252] (II) XINPUT: Adding extended input device "Primax Kensington Eagle Trackball" (type: MOUSE, id 8)
[  2923.252] (II) evdev: Primax Kensington Eagle Trackball: initialized for relative axes.
[  2923.252] (WW) evdev: Primax Kensington Eagle Trackball: ignoring absolute axes.
[  2923.253] (**) Primax Kensington Eagle Trackball: (accel) keeping acceleration scheme 1
[  2923.253] (**) Primax Kensington Eagle Trackball: (accel) acceleration profile 0
[  2923.253] (**) Primax Kensington Eagle Trackball: (accel) acceleration factor: 2.000
[  2923.253] (**) Primax Kensington Eagle Trackball: (accel) acceleration threshold: 4

Xorg.0.log-before

[    59.946] (II) config/udev: Adding input device Primax Kensington Eagle Trackball (/dev/input/event2)
[    59.946] (**) Primax Kensington Eagle Trackball: Applying InputClass "evdev pointer catchall"
[    59.946] (II) Using input driver 'evdev' for 'Primax Kensington Eagle Trackball'
[    59.946] (**) Primax Kensington Eagle Trackball: always reports core events
[    59.946] (**) evdev: Primax Kensington Eagle Trackball: Device: "/dev/input/event2"
[    60.000] (--) evdev: Primax Kensington Eagle Trackball: Vendor 0x47d Product 0x2048
[    60.000] (--) evdev: Primax Kensington Eagle Trackball: Found 3 mouse buttons
[    60.000] (--) evdev: Primax Kensington Eagle Trackball: Found scroll wheel(s)
[    60.000] (--) evdev: Primax Kensington Eagle Trackball: Found relative axes
[    60.000] (--) evdev: Primax Kensington Eagle Trackball: Found x and y relative axes
[    60.000] (--) evdev: Primax Kensington Eagle Trackball: Found absolute axes
[    60.000] (II) evdev: Primax Kensington Eagle Trackball: Forcing absolute x/y axes to exist.
[    60.000] (II) evdev: Primax Kensington Eagle Trackball: Configuring as mouse
[    60.000] (II) evdev: Primax Kensington Eagle Trackball: Adding scrollwheel support
[    60.000] (**) evdev: Primax Kensington Eagle Trackball: YAxisMapping: buttons 4 and 5
[    60.000] (**) evdev: Primax Kensington Eagle Trackball: EmulateWheelButton: 4, EmulateWheelInertia: 10, EmulateWheelTimeout: 200
[    60.000] (**) Option "config_info" "udev:/sys/devices/pci0000:00/0000:00:12.0/usb3/3-1/3-1:1.0/0003:047D:2048.0001/input/input5/event2"
[    60.000] (II) XINPUT: Adding extended input device "Primax Kensington Eagle Trackball" (type: MOUSE, id 8)
[    60.000] (II) evdev: Primax Kensington Eagle Trackball: initialized for relative axes.
[    60.000] (WW) evdev: Primax Kensington Eagle Trackball: ignoring absolute axes.
[    60.000] (**) Primax Kensington Eagle Trackball: (accel) keeping acceleration scheme 1
[    60.000] (**) Primax Kensington Eagle Trackball: (accel) acceleration profile 0
[    60.000] (**) Primax Kensington Eagle Trackball: (accel) acceleration factor: 2.000
[    60.000] (**) Primax Kensington Eagle Trackball: (accel) acceleration threshold: 4
[    60.001] (II) config/udev: Adding input device Primax Kensington Eagle Trackball (/dev/input/mouse0)