Brightness Adjustment on Desktop Computer

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http://askubuntu.com – I have Ubuntu 12.10 I need an application/software that can increase and decrease my brightness. I know I can do it through my pc monitor but I don't want that. I want to control it through a software. I personally cannot find an application about this issue. I know that it is possible because the OS has the Fading effects before Screen Savers. I want to control brightness through a software for desktop pc. (HowTos)