⎡ Virtual core pointer                    	id=2	[master pointer  (3)]
⎜   ↳ Virtual core XTEST pointer              	id=4	[slave  pointer  (2)]
⎜   ↳ USB Optical Wheel Mouse                 	id=6	[slave  pointer  (2)]
⎣ Virtual core keyboard                   	id=3	[master keyboard (2)]
    ↳ Virtual core XTEST keyboard             	id=5	[slave  keyboard (3)]
    ↳ USB2.0 VGA UVC WebCam                   	id=7	[slave  keyboard (3)]
    ↳ AT Translated Set 2 keyboard            	id=8	[slave  keyboard (3)]