[ubuntu] Extended monitor in dell xps l502

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http://ubuntuforums.org – Is there anyway I could configure extended display on my dell xps l502 system. I have tried bumblebee without any luck. I want to enable extended display and don't care about the power management or which graphics card it uses. I just want to enable it. Can anyone please help in doing this? PS: I ma using the latest available version in ubuntu! (Hardware)