Found a solution:

Following the instructions found in [1] Adding the line

    Option “RegistryDwords” “EnableBrightnessControl=1″

to /etc/X11/xorg.conf make it.

Looking for a way to make permanent the change.

[1] http://www.addictivetips.com/ubuntu-linux-tips/fix-laptop-
brightness-toggle-issues-in-ubuntu-10-10-and-11-04-tip/

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https://bugs.launchpad.net/bugs/1006453

Title:
  Screen brightness is not affected by keys ("MacBook Pro")

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