What's the blue LED for?

I know, it’s the dumbest Q in the world.
I’m not used to reading schematics of this caliber. I tried to and failed.
I have the ROCK Pi S D4W revision 1.2.
Green LED is power. What’s the Blue LED for? Which page of the schematic? I want to learn!

In the kernel images provided, it’s used as a “heartbeat” to let you know the kernel is still running and hasn’t crashed or lost power, etc. It could be repurposed for other things, however, as it’s just hooked up to a GPIO pin.

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Thanks that answers my question.

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howto turn off LED for save battery

As root: echo 0 > /sys/class/leds/rockpis:*:power/brightness

Actually, that will not work because bash can’t expand terminal paths :frowning:
You’ll have to do both manually,
echo 0 > /sys/class/leds/rockpis:blue:user/brightness
echo 0 > /sys/class/leds/rockpis:green:power/brightness