[BertoldVdb]

I was able to use the rfkill command on a Dell and a Thinkpad with the hardware switch turned off. However I don't know how that was implemented internally, maybe the switch was not connected directly to the mini-pcie slot. I don't have these laptops anymore so I can't check it.

I made the video on the webcams, these are quite modern ones. Nearly all of them have special UVC commands that allow reading and writing the internal CPUs memory (a lot are 8051 based). You can find the register that controls the led GPIO and control it freely. Only on one of them I did not find a way to modify the led behavior without modifying the firmware to add an extra command.