Comment 2 for bug 1229591

$ sudo evtest
No device specified, trying to scan all of /dev/input/event*
Available devices:
/dev/input/event0: Power Button
/dev/input/event1: Sleep Button
/dev/input/event2: Lid Switch
/dev/input/event3: Power Button
/dev/input/event4: AT Translated Set 2 keyboard
/dev/input/event5: Video Bus
/dev/input/event6: HDA Intel PCH HDMI/DP,pcm=7
/dev/input/event7: HDA Intel PCH HDMI/DP,pcm=3
/dev/input/event8: HDA Intel PCH Headphone
/dev/input/event9: HDA Intel PCH Mic
/dev/input/event10: Dell WMI hotkeys
/dev/input/event11: SynPS/2 Synaptics TouchPad
/dev/input/event12: Laptop_Integrated_Webcam_HD
Select the device event number [0-12]: 10
Input driver version is 1.0.1
Input device ID: bus 0x19 vendor 0x0 product 0x0 version 0x0
Input device name: "Dell WMI hotkeys"
Supported events:
  Event type 0 (EV_SYN)
  Event type 1 (EV_KEY)
    Event code 148 (KEY_PROG1)
    Event code 149 (KEY_PROG2)
    Event code 161 (KEY_EJECTCD)
    Event code 224 (KEY_BRIGHTNESSDOWN)
    Event code 225 (KEY_BRIGHTNESSUP)
    Event code 227 (KEY_SWITCHVIDEOMODE)
    Event code 236 (KEY_BATTERY)
    Event code 238 (KEY_WLAN)
    Event code 240 (KEY_UNKNOWN)
  Event type 4 (EV_MSC)
    Event code 4 (MSC_SCAN)
Properties:
Testing ... (interrupt to exit)

It displayed nothing when I pressed the keys. I also tried choosing event4 with the same result (or rather, lack of result)