Triple-head with a 2nd (different) gfx card, possible?

[Wolfgang S. Rupprecht]

Fernando Cassia <fcassia at gmail.com> writes:
>    My current setup includes a PCI-X ATI X1600 board, which its dual
>    DVI+VGA outputs.
>    That card has two 19' monitors connected, a DVI one and a VGA-only one,
>    both LGs.
>    Now, suppose I don't want to buy another gfx board, but rather connect
>    an external USB-to-VGA adapters like these:
>    http://goo.gl/TqchG
>    Would Fedora recognize the 3rd display (no matter it being much slower
>    due to the USB 2.0 interface) and put the 3rd screen alongside the
>    other two so I can move app windows from one monitor to the next?
>    Or would it be a separate X display because it's handled by a different
>    driver?

It might well recognize the usb framebuffer (I have no idea if it will
even do that.)  The stumbling block will be to get the current Xorg to
span two framebuffers.  Back in the early days of X11 it did have an
extension called Xinerama ( http://en.wikipedia.org/wiki/Xinerama ).
That extension appears to have suffered bit-rot and no longer works for
me.  I tried to get two different Radeon frame buffers to work together
but ended up buying a new card that had at least three outputs.  Sadly
those are hard to come by and they charge an arm and a leg.

-wolfgang
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