Cannot adjust brightness on Laptop with Ubuntu 11.10

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http://askubuntu.com – I'm currently using a LG laptop with Nvidia Cuda GeForce GT 335M. I have difficulty adjusting the screen brightness using FN+Arrow Up/Arrow Down. The brightness indicator will appear and the bar will not decrease beyond the first jump. Subsequently, if I depress the button, the indicator bar will randomly appear to be dim and bright, with no actual difference to the screen brightness. I have tried to adjust the brightness through System Settings>Screen. Although the bar can be dragged up and down, there seems to be no actual difference in the brightness. Furthermore, after installing Ubuntu (HowTos)