tail /var/log/Xorg.0.log
**) Macintosh mouse button emulation: YAxisMapping: buttons 4 and 5
(**) Macintosh mouse button emulation: EmulateWheelButton: 4, EmulateWheelInertia: 10, EmulateWheelTimeout: 200
(II) XINPUT: Adding extended input device "Macintosh mouse button emulation" (type: MOUSE)
(II) Macintosh mouse button emulation: initialized for relative axes.
(II) config/udev: Adding input device Macintosh mouse button emulation (/dev/input/mouse0)
(II) No input driver/identifier specified (ignoring)
(II) config/udev: Adding input device Sony Vaio Jogdial (/dev/input/event6)
(II) No input driver/identifier specified (ignoring)
(II) config/udev: Adding input device Sony Vaio Jogdial (/dev/input/mouse1)
(II) No input driver/identifier specified (ignoring)