zlacker

Thanks for your reply — yourself as the Source can only make me feel flattered then for you responding to me.

> Macbooks manufactured since 2014 turn on the LED whenever any power is supplied to the camera sensor, and force the LED to remain on for at least 3 seconds.

That convinced me originally I think, good old days! I'd almost forgotten about it. The way you phrased it, it sounded like 50% OS concern to me.

But if cam & LED rly share a power supply, and the LED is always on without any external switch, Good then!

>>moritz+(OP)
I was not very popular with the camera firmware folks for a while. They had to re-architect a bunch of things as they used to occasionally power on the camera logic without powering the sensor array to get information out of the built-in OTP. Because the LED now came on whenever the camera was powered they had to defer all that logic.

>>axoltl+l2
What does OTP stand for in this case? The camera PROM??

>>Profes+M3
Apologies. OTP is One-Time-Programmable. The physical implementation of this varies, in this specific case it was efuses (anti-fuse, actually). It's used for things like calibration data. For a camera it contains information about the sensor (dead pixels, color correction curves, etc.).