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Brightness control
==================
Add the following line in `/etc/rc.local` to make it a startup job ::
sudo chmod o+w /sys/class/backlight/<somefile>/brightness
Now with a simple bash script we can `echo` suitable values to
above `brightness` file and change the brightness of the screen. It would
be a good practice to know the max brightness allowed by reading the file ::
cat /sys/class/backlight/<somefile>/max_brightness
Now to set brightness we use ::
echo 50 > /sys/class/backlight/<somefile>/brightness
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