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I used to be able to turn off the green on-board LED with the following commands:

echo none | sudo tee /sys/class/leds/led0/trigger
echo 1 | sudo tee /sys/class/leds/led0/brightness

This no longer works, however. What's the new procedure?

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Rather than trying to fight with the kernel (you will always lose) set it properly using Device Tree:-

Include

dtparam=act_led_trigger=none

in config.txt.

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