Is a Macbook pro not able to use dual screen on the integrated graphics card?

Question

I have a MBP early 2011 model and when running on the integrated GPU I'm unable to dual screen. The screen is a VGA monitor running at 1400 x 900 yet it won't display so do I always have to switch to my AMD GPU to run dual screens? I'm running gfxCardStatus to switch between them and i'm just trying to save power.