Can you go through how you went from one card working upto two? I can get two detected correctly but not able to change resolution and no acceleration.
I have had success with 2.0-RC4, turning GraphicsEnabler on with one card inserted works perfectly, but as I move to two cards I just get a kernel panic and no startup.
I had a look at your posts in the other thread too but couldn't work out how to extract the plist generated by the GraphicsEnabler? I figure that I can put a card in one slot and save the plist, then move it to the other slot and save the plist, then combine them both with the @0,AAPL,boot-display key added to the appropriate card. Is that along the right lines? Any assistance appreciated.