So, here's my odd question:
Is it possible to put the older (pci) card in the system w/the radeon, have the radeon render to a texture, and have the older card simply display the texture?
I don't think that you could easilly do it transparently to apps. It *might* be possible to have the Radeon driver copy the back-buffer to the other card on a glXSwapBuffers, but that doesn't handle single-buffered visuals or rendering to the front-buffer.
p.s. I realize this still doesn't resolve the 2d issue, but 2d off the older card should be fine. Kinda like the 3d pass-through that was used w/the 3dfx voodoos.
The original PowerVR cards (i.e., the Matrox M3D) worked exactly like this. They were a small PCI card w/4MB of texture memory. They would render the scene 1 raster at a time (basically) and blit it across the PCI bus to the other video card. The original PowerVR cards didn't have a frame-buffer or a video output at all! Oh yeah, and they were faster than a 4MB Voodoo Graphics based card. ;)
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