@WindPower: This isn't relevant, since you installed both drivers
nvidia-bl-dkms and mbp-nvidia-bl-dkms. (If you didn't install the latter
from the mactel repo, the version provided by the linux kernel should
also have been sufficient.) However, until nvidia-bl 0.15.0 nvidia-bl
didn't auto-load. mbp-nvidia-bl always does. So, if you added a line to
/etc/modules for nvidia-bl, you ended up loading both drivers providing
two interfaces in /sys/class/backlight. Furthermore, if the brightness
keys didn't work, HAL has just used the wrong interface.

As of nvidia-bl version 0.15.1, I got auto-loading to work. That also
means the package now installs a file in /etc/modprobe.d, that
blacklists mbp-nvidia-bl. That's why your scripting approach doesn't
work anymore - the driver you used is just missing.

Finally, for some strange reason nvidia-bl doesn't work on some MacBook
Pro 5 models. Probably those incorporating two graphics adapters. But
due to a lack of information, I don't really know.

That means, if you can confirm that nvidia-bl doesn't work (as you did),
just deinstall it. There's no reason to have both drivers installed.
Unfortunately, mbp-nvidia-bl is also known to not work on some Apple
machines. That's why there are both in the repos.

Btw: They aren't completely redundant. While nvidia-bl (in theory)
should support a wide range of machine incorporating Nvidia graphics
adapters (not just from Apple), does mbp-nvidia-bl only work on Apple
machines. In contrast to his name, not just MacBook Pros with Nvidia
graphics, but all models incorporating Intel processors.

-- 
nvidia-bl-dkms 0.15.1 update breaks backlight
https://bugs.launchpad.net/bugs/516354
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