The Backlight brightness can be changed from user space using the /sys interface.
$ ls /sys/devices/platform/mxs-bl.0/backlight/mxs-bl
actual_brightness brightness max_brightness subsystem
bl_power device power uevent
To see what the maximum brightness is:
$ cat /sys/devices/platform/mxs-bl.0/backlight/mxs-bl/max_brightness
100
To change brightness
$ echo 100 > /sys/devices/platform/mxs-bl.0/backlight/mxs-bl/brightness
The default brightness is 50.
