chmod 0333 /sys/class/leds/amber/brightness; echo 0 > /sys/class/leds/amber/brightness - disables RED LED completely
chmod 0644 /sys/class/leds/amber/brightness - enables it
You're basically changing permissions so the system cannot modify the brightness property of the LEDs. You are then setting the brightness to 0. Until you change the permissions back to 644, your LEDs will be off. No charging light, no LED notification.
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