Unfortunately, I'm not sure how to get the side displays to turn off when playing at 1920x1080. I always just swap back to extended mode when I want to game on a single screen. In Windows 7, just press the Windows Key and P. Then, choose Extend. To swap back to Eyefinity, press Windows Key and P again and then choose Duplicate. The same thing can be accomplished by creating Presets in the Catalyst Control Center and assigning them hotkeys. But, I've found that to be less reliable.
There may be a better solution.
*Edit: You can also use Windows Key + P and choose Computer Only if you want to shut down the side displays rather than keeping them in extended mode.
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