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The laptop, which is relatively new, has 2 outputs (HDMI and analog) plus the built-in screen. Has anyone done this before? Will AMD / ATI's new drivers that support the 5xxx series maybe bring support for more than 2 screens to older cards? Is there something I need to do that will enable this?

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You can use a small external device called Matrox Dualhead2Go or Matrox Triplehead2Go for this. It plugs into the HDMI output and splits the image across two or three displays. You should be able to use one image from the display on your laptop screen and split the image from the external output on two or three screens. Depending on which device you use, you can populate three or four screens in total.

The limitation is the image displayed on the Triplehead2Go or Dualhead2Go acts as a single image for Windows. This may or may not be a problem depending on what you want to achieve. You can place your windows and applications as needed, but any fullscreen elements will span across both / all thee external displayes.

While this may be not what you are about, without an external device you are out of luck. The HD 3600 features only Two independent display controllers, not three, same as most display adapters.

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  • +1 sadly it is still relatively unusual for a laptop to have 2 simultaneously-working external video outputs
    – bobince
    Nov 24, 2009 at 19:47
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    Hi Suma, I'm familiar with the Matrox solutions. However my question remains: Is it possible with the internal Radeon graphics card alone?
    – Joshua
    Nov 24, 2009 at 20:49
  • Note: this Matrox solution is now a video card. It is a small accessory which plugs into an ouput of any video card.
    – Suma
    Nov 27, 2009 at 10:21
  • As explained in the post, the Radeon card is not able to drive more than two displayes.
    – Suma
    Nov 27, 2009 at 10:21
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    I was hoping it was not a hardware limitation. Based on the specifications ('two independent display controllers'), that seems to be the case :(. With regard to your final comment "...not three, same as any display adapter out now." Please read up on the Radeon HD 5xxx series, which now supports as many as 6 displays. amd.com/us/products/desktop/graphics/ati-radeon-hd-5000/hd-5870/…
    – Joshua
    Dec 7, 2009 at 15:36

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