In these days webcam and LED in some laptops are interlocked either on a firmware base or a hardware base. Is there any possibility to determine whether or not the LED connection to the webcam is hardware based or firmware based? If it's hardware based then malware can't disable it.

I want to find out for Dell Inspiron 15 3521.

  • I'm not sure but I guess could be software based. On my phone I tested making a lab with a trojan and I hijack my phone's webcam without enabling the LED Jan 5, 2017 at 21:40
  • How does phone have led on cam
    – user119042
    Jan 5, 2017 at 21:42
  • Yes, is a Google Nexus 5 and if you enable the webcam the LED is lighted on... but with the trojan the LED is still off. You can check the LED here: notebookcheck.org/fileadmin/Notebooks/Google/Nexus_6P/… Jan 5, 2017 at 21:44
  • Ok but what about laptops
    – user119042
    Jan 5, 2017 at 21:45
  • Trojaning my virtual Windows 7 The laptop's LED was enabled... so not sure if it depends of firmware or why is different. That's because I don't have an answer for you. Sorry. Jan 5, 2017 at 21:47

1 Answer 1


if you are running linux

uvcdynctrl -c

May show LED

if so

LED_STATE: 0=Always-off, 1=Always-on, 2=Always-blink, 3=Auto on


 uvcdynctrl -d CAMERA_NAME -s 'LED1 Mode' 1

Should turn it on


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