Same here on my Samsung R560 Aura Studentbook (NVIDIA GeForce 9600M GT) on 
Ubuntu 8.10 Beta.
Neither writing to /proc/acpi/video/NVID/LCD (which is the correct file on my 
machine) nor using the brightness function keys works.
Not even under outside of X.

Could anyone please investigate in this?
This seems to be not taken care of for quite some time now.

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backlight brighness control does not work (Samsung Q45 with Nvidia GForce 8400M)
https://bugs.launchpad.net/bugs/146710
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