Found a permanent solution with nvidia graphic card.

Just create a file in /etc/X11/xorg.conf.d/50-nvidia.conf with the
following content:


Section "Device"
    Option "RegistryDwords" "EnableBrightnessControl=1"
    Identifier     "Device0"
EndSection


>From now on, you have brightness control.

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

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

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