I am using Samsung netbook model no. N220 and it camed with pre-installed windows 7 basic version. Last night I upgraded my laptop to windows 7 ultimate version. I finished installation process properly, and started my laptop. When I tried to adjust brightness of my laptop using keyboard function keys, then I found that nothing is changing, then I tried other function keys then these keys were working. Then I realized that my brightness keys are not working. Does any one know why this is happening in my laptop?
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