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[WindPower <admin@xxxxxxxxxxx>]

$ cat /sys/class/dmi/id/product_name
MacBookPro5,3
$ echo 0 | sudo tee /sys/class/backlight/nvidia_backlight/brightness
[sudo] password for myusernamehere: (typed password)
0 (backlight not changed)
$ echo 512 | sudo tee /sys/class/backlight/nvidia_backlight/brightness
512 (backlight not changed)
$ echo 1023 | sudo tee /sys/class/backlight/nvidia_backlight/brightness
1023 (backlight not changed)
$

I don't know if this is relevant, but back on an older version of
Ubuntu, the keys weren't working either and I to work around this I had
set up two scripts that I had bound to the F1 and F2 keys, and they
basically did the same thing: Incremented or decremented the contents of
the brightness pseudo-file. However, the file path was
/sys/class/backlight/mbp_backlight/brightness, not
/sys/class/backlight/nvidia_backlight/brightness. I do not have a
/sys/class/backlight/mbp_backlight/brightness file any more now.

-- 
nvidia-bl-dkms 0.15.1 update breaks backlight
https://bugs.launchpad.net/bugs/516354
You received this bug notification because you are a member of Mactel
Support, which is the registrant for Mactel Support.

Status in Mactel Support: New
Status in Ubuntu: New

Bug description:
Since February 1st's 0.15.1 update of the nvidia-bl-dkms package, the backlight of the screen cannot be changed.
This happens on my Macbook Pro 5-3 but also happens to the 5-5 model according to http://ubuntuforums.org/showthread.php?p=8756152 , so it doesn't seem very far-fetched to say that might happen to all Macbook Pros.

Downgrading nvidia-bl-dkms to version 0.15 makes the screen backlight slider "slidable" again but it has no impact on the screen's actual backlight.

Using Kubuntu 9.10 64-bit on a Macbook Pro 5-3 with kernel 2.6.31-17-generic (but it does the same on the previous kernels as well).