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[Pedro Ângelo <pangelo@xxxxxxx>]

I get:

$ cat /sys/class/dmi/id/product_name
MacBook5,1

$ echo 0 | sudo tee /sys/class/backlight/nvidia_backlight/brightness
0

(nothing happens to backlight)

Removing nvidia-bl-dkms and replacing it by mbp-nvidia-bl-dkms makes the
backlight controls work again

This is on a unibody mbp with a dual gpu running ubuntu karmic with the
mactel and puredyne ppas

-- 
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: Invalid

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).