Is there a way to build an initial VidPN in Win 7 driver

Hi,

I need a help for the scenario below:
================================
I have two displays - CRTC and DVI output.
the crtc is the primary display.
Now I want to change and try to tell Win 7 to switch to DVI as primary after
reboot.
How can I do in the driver?

It seems on Vista, the DXgk call recommendVidPnTopology can do it.
But in WIn 7, this DDI is removed.

In IsSupportedVidPn, I can fail the original VidPN (Crtc). And I can let the
OS shows desktop on DVI.

But when I try to switch to crtc from desktop property page, I got unable
save display settings error message.
===============================
Any expert can help me?

Thanks in advance.

--
KC