If it annoys me too much, I do three times
echo 0|sudo tee /sys/class/leds/dell\:\:kbd_backlight/brightness
This tends to keep the backlight off for a while.
If it annoys me too much, I do three times
echo 0|sudo tee /sys/class/ leds/dell\ :\:kbd_ backlight/ brightness
This tends to keep the backlight off for a while.