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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