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[Hooman Baradaran <linux@xxxxxxxxxxx>]

I removed the hacks and set the maximum brightness to 16777215.
But still as soon as I change the brighness (up or down, via command line or Gnome) the screens goes dark.
If it helps, the screens goes dark in 2-3 steps not right away (but pretty fast).

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nvidia-bl-dkms 0.16.10 Blank screen on brightness change
https://bugs.launchpad.net/bugs/599607
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Status in Mactel Support: New

Bug description:
I have a Sony Vaio VPCCW21FX (Nvidia 310M) running Lucid.

After I installed nvidia-bl-dkms 0.16.10, the brightness buttons showed the brightness indicator but it didn't move.
Manually writing values to /sys/class/backlight/nvidia_backlight/brightness turn the backlight completely off (the backlight only turned back on after a suspend/resume).

Then I copied sony brightness scripts from here:

http://ubuntuforums.org/showthread.php?t=1420341

... after that, using the brightness buttons on the laptop turned the screen off as well.