what does this mean?
// found it... should be hw_config.sh.
it's working! thanks a lot
chmod 666 /sys/class/leds/button-backlight/brightness
chmod 666 /sys/class/leds/button-backlight/max_current
echo 1 > /sys/class/leds/button-backlight/brightness
echo 1 > /sys/class/leds/button-backlight/max_current
but this does not work. After 1 minute or two, the light back again