I'm trying to use usr LEDs on BeagleBone Green Wireless on Debian 8.6 (default image from http://beagleboard.org/green with kernel 4.4.26-ti-r59) for my own debug purposes, but some script make it impossible. It is caused most likely by a JS script (after uninstalling nodejs leds stopped beating, but JS is crucial for me).
I've already tried to switch mode of led blink to none:
# cd /sys/class/leds/beaglebone\:green\:usr0
# echo none > trigger
# cat trigger
[none] rc-feedback kbd-scrollock ...
and to control brightness:
# echo 0 > brightness
# cat brightness
0
# echo 255 > brightness
# cat brightness
0
# cat brightness
1
As you can see - value of brightness is simply being overwritten by another program (script) running in loop. Does anyone have an idea which script may cause this situation?