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I have a Dell Latitude 8420. It is connected to a dock.

Is there any way to have two monitors connected to this setup and also use the laptop screen too? I want the desktop extended on the 3 displays. I am using Windows 7 Professional.

How would things change if I wanted to have 3 external monitors and not use the laptop display?

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4 Answers

up vote 6 down vote accepted

If I'm correct, you will not be able to use all three monitors at the same time. If you hook up two monitors to your docking-station, you will not be able to use the laptop screen at the same time. If you only use one external monitor, you can still use the laptop screen. This is due to limitations of the GPU. I have a Latitude E6510 with a docking station and experienced the same thing.

If you absolutely need to use three monitors, you can maybe look into "exotic" solutions like using an external USB graphic card.

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as you suggested USB graphic card was the way to go. –  Codrguy Aug 12 '11 at 23:17
    
Great, glad it worked. –  socken23 Aug 14 '11 at 6:38
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From what I have read about the linked dock, you're limited to two displays. This can be made up in one of two configurations:

  1. Laptop LCD and one external monitor
  2. Two external monitors but no Laptop LCD
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I can confirm that a USB graphics adapter is the solution. I use a HP 8510W with an HP usb docking station. This has a DisplayPort connector which supports playing even HD videos on my 1600*1200 screen (the maximum width for this docking station is 1680). Note however that when using the dock, you lose Aero on all of your screens.

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Same is the case with other laptops and displays ( tested with HP Elitebook 8470p and Dock, two monitors (ViewSonic)).

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