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I have a Lenovo W520 with an I7 2720QM+Nvidia Quadro 2000M.

Now, I always use the system in integrated graphics mode, but I've found that with this setup, the system doesn't detect external monitors attached via the VGA socket - it does detect them using discrete graphics.

Is there something I can do? What if use a WDMI cable? Would the drivers at solve this problem (assuming I update to Oneric)?

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did you try using the official nvidia drivers? using nvidia-xsettings, it is quite easy to see which screens the nvidia card can see – Janus Troelsen Jul 30 '12 at 19:48

There should be no error with the intel cpu built-in card, but if you wish to use the nVidia instead, use "bbswitch" and if your graphic card is optimus, you should use "bumblebee" too

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