From mboxrd@z Thu Jan  1 00:00:00 1970
From: Oliver Seitz <info@vtnd.de>
Subject: Re: Question (about setting brightness and contrast)
Date: Tue, 15 May 2012 09:34:56 +0200
Message-ID: <4FB20720.4000701@vtnd.de>
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Hi! I'm no real expert, but I dare to guess some answers anyway...

> Will there ever be a Control Center like the Windows version ?

Probably not. It is not the job of a driver to communicate with the 
user. GUIs are made by other people. Your desktop environment could 
provide such a tool.

To increase brightness to 150%, you can use

xrandr --output <which_one> --brightness 1.5

To reduce contrast to 75%, you can use

xrandr --output <which_one> --gamma 0.75:0.75:0.75


Greets,
Kiste