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Backlight

root@varsomam43:/# cd /sys/class/backlight/backlight/
root@varsomam43:/sys/class/backlight/backlight# echo 0 > brightness
root@varsomam43:/sys/class/backlight/backlight# echo 7 > brightness
root@varsomam43:/sys/class/backlight/backlight# echo 4 > brightness
root@varsomam43:/sys/class/backlight/backlight# echo 7 > brightness