X.org with multiple video cards

[Dave Ahlswede]

On Thu, 2004-12-02 at 20:41 -0500, Brian Fallik wrote:
> I asked this question on the gentoo forums and didn't get any response,
> so I'm moving upstream.
> 
> I have an nforce2 motherboard (w/ built in video chip) in addition to a
> nvidia GeForce4 Ti 4200. I currently have the nforce video disabled and
> only use the 4200, which works perfectly in x-org 6.8. 
> 
> So here comes the question. 
> 
> 1. Can I configure x.org (and the kernel, and udev, etc) to recognize
> both video cards? 
> 
> 2. Can I configure x.org to use the nforce2 as a secondary screen, as
> though it were a dual head configuration?  I want both screens to be
> controlled by a single terminal/login/session.
> 
> 3. Can I have this controllable, so that it only happens occasionally?
> In other words, the monitor I connect to the nforce2 may not always be
> connected and I don't want any errors in this case. 
> 
> Thanks in advance!

IIRC, there's a hardware limitation that you can't use the onboard video
and an add-on AGP card simultaneously-- the addon card will usually
automatically disable the on-board video. An add-on PCI card would
probably work, however.