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Backlight

On VAR-SOM-MX8 and VAR-SOM-MX8X

$ cd /sys/class/backlight/backlight
$ cat max_brightness
$ cat brightness
$ echo 0 > brightness 
$ echo 50 > brightness
$ echo 100 > brightness
$ echo 80 > brightness

On SPEAR-MX8

$ cd /sys/class/backlight_lvds0/backlight
$ cat max_brightness
$ cat brightness
$ echo 0 > brightness 
$ echo 50 > brightness
$ echo 100 > brightness
$ echo 80 > brightness