jde to trvale vypnout/zapnout
staci vepsat do /sys/class/leds/button-backlight/brightness vepsat 0
pro vypnuti
echo 0 > /sys/class/leds/button-backlight/brightness
chmod 444 /sys/class/leds/button-backlight/brightness
pro zapnuti
echo 255 > /sys/class/leds/button-backlight/brightness
chmod 444 /sys/class/leds/button-backlight/brightness
po restartu se to zas obnovi do puvodniho nastaveni
EDIT: jestli najdu trosku casu tak bych na to vecer moh mozna vyrobit jednoduchou aplikaci