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I'm using ATI open source drivers with an ATI HD 3870 on Ubuntu 13.04. When I open games like Teeworlds, they open stretched across both of my monitors.

The card is not supported by fglrx.. and I even tried installing 12.04 and the legacy driver, but even the legacy driver said that my card was unsupported.

How can I force the games to only open on one monitor?

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