As mentioned, Once I start a game or a movie, my screen goes darker and all dark default dark parts on the screen look much darker, sometimes, I just don't see where to go in the game etc. Look at the screenshot from Civ5. Normally, the factory is pretty visible. I thought it is the screen issue, reset my monitor settings, contacted Asus but they said it's rather graphic card issue. I deinstalled my drivers and reinstalled them again. Updated my Windows, nothing helped.
System: Windows 7
AMD card: Sapphire Radeon DUAL-X R9 270X 4 GB GDDR5 11217-04-20G
Monitor: Asus VS229DA-W
Can you help?