Low external monitor resolution

Hallo, I've the Macbook AIr 13" (2012) with an external Samsung Synchmaster XL 2370 LED monitor. Unfortunately, the screen resolution of the 1920x1080 Samsung monitor is not at 1920x1080, but lower. The Mac OS 10.8.1 uses the profile HD 709-A. This cannot be the correkt profile. Does anyone have an advice? 

Are you using mirrored or extended display mode. If mirrored then the resolution of the laptop will also be mirrored. If using extended mode you can set the resolution of the external monitor differently than the resolution of the laptop. And try to toggle the resolution in System Preferences>Displays.

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