Had been working with this user on forum thread:
http://ubuntuforums.org/showthread.php?t=2112027
I've confirmed that his /sys/class/backlight/acpi_video0/brightness data
can be changed,  but those changes do not get picked up.

What he didn't mention yet... is that if he does reboot to MAC OSX,
changes the brightness setting there, then reboots the hardware back
into Ubuntu, the MAC OSX changed setting is retained.

He has a functional workaround, but it is outside Ubuntu and the Linux
kernel. Changes within Ubuntu do not make affect.

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https://bugs.launchpad.net/bugs/1115555

Title:
  Backlight control does not work, but there are entries in
  /sys/class/backlight.

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