[nix-shell:~]$ sudo evtest
No device specified, trying to scan all of /dev/input/event*
Available devices:
/dev/input/event0:      AT Translated Set 2 keyboard
/dev/input/event3:      Power Button
/dev/input/event4:      Sleep Button
/dev/input/event5:      Lid Switch
/dev/input/event6:      Power Button
/dev/input/event7:      Video Bus
/dev/input/event8:      Video Bus
/dev/input/event9:      DELL Wireless hotkeys
/dev/input/event10:     HDA ATI HDMI HDMI/DP,pcm=3
/dev/input/event11:     HDA Digital PCBeep
/dev/input/event12:     HD-Audio Generic Headphone Mic
/dev/input/event13:     Dell WMI hotkeys
/dev/input/event14:     Integrated_Webcam_HD
Select the device event number [0-14]: