Macbook6-1 (GeForce 9400M)
Ubuntu 12.04
nvidia-current   295.40-0ubuntu1.1 

Works perfectly without nvidia driver (nouveau driver).

Attached values of /sys/devices/virtual/backlight.
Write random values to any of that files, didn't destroy the machine neither 
did nothing.

Modifications to the default command line arguments to the kernel where
made in grub:

* reboot=pci  # To make the computer restart (before, shutdown -r now just 
hangs for ever after system shutdown)
* acpi_backlight=vendor (Tested with and without without any change).


** Attachment added: "# find /sys/devices/virtual/backlight/ -type f -exec echo 
-n "{}: " \; -exec cat "{}" \;"
   
https://bugs.launchpad.net/ubuntu/+bug/1006453/+attachment/3277654/+files/output

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

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

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