No DVI output with T420 on integrated graphics card and Mini Dock Series 3

Because of some application problems I have to set my new T420 to only use the integrated graphics card (disabling the NVidia Optimus feature). In this configuration I seem to be unable to use the DVI port on the Mini Dock Series 3, there is simply no signal and Windows reports that no monitor could be found. The VGA output works but the picture quality is quite bad.
Is this a known design limitation or do I deal with a driver issue?
Thanks
Dan

Yes, that works but there is the drawback of battery life. In the course of the day I often undock the laptop to go to meetings and using the discreet graphics card uses a lot more power and significantly reduces the time i can work without power. I would have to restart the laptop and change the setting in the BIOS after I undock, which is just not practical. For what I do I don't need the graphics power of the discreet card.

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