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I have Asus G55 ES71 laptop and I recently installed Ubuntu in it. Whenever I start my laptop, the brightness level is set to maximum by default and it doesn't change. Manually changing it through settings doesn't help. I have also tried the solutions posted on forum like this one :

gksudo gedit /etc/rc.local

and

echo X > /sys/class/backlight/intel_backlight/brightness

I tried substituting X with different values and rebooted but nothing happened. I manually tried to change the values in files actual_brightness and brightness from directory /sys/class/backlight/acpi_video0 but those files are read only and don't allow me to change the values. I have actual_brightness=0, brightness=0 and max_brightness=10 in those files currently.

As a computer engineer, I am required to sit in front of it the whole time and it's really taking a toll on my eyes!

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The brightness is controlled by Xorg/Xserver after boot. You should look there, also does the Asus G55ES71 has a intel GPU? –  Braiam Oct 2 '13 at 0:45
    
possible duplicate of Brightness is reset to Maximum on every Restart –  Darshana Oct 30 '13 at 14:27

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