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17 R5, AGA, only works with external screen?

I have an Alienware 17 R5 and recently just purchased an Asus GTX 1080 Ti Turbo. So I have connected the amplifier and installed the latest driver. The laptop detects 3 graphic cards (Intel 630, GTX 1080, and the external GTX 1080 Ti). But the GTX 1080 Ti only works when plugged with an external monitor (direct output from the card). In short, the laptop is still running the internal graphic card when using the laptop screen, despite the amplifier is connected.

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