How to change the lightness of the screen through the vedio configuration?

[yufan]

In Windows version of nvidia graphic card driver,there is a option such that 
u can change the lightness of the sreen(desktop and the vedio).can Fedora do 
the same thing?because my monitor is outdated.the screen is a bit too gloomy 
when i watch movie on it. so i want to light it up through software.
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