I've used nvidia-settings to create my xorg.conf file, and it is now working. I think that when you have 2 vga devices, you only need to give BusID for the primary one. The BusID of the second one is guessed.
So, i you are encountering problems, Use nvidia-settings to create a valid xorg.conf file and make sure you have a BusID line iin your "device" section.
For me, bug corrected.
I've used nvidia-settings to create my xorg.conf file, and it is now working. I think that when you have 2 vga devices, you only need to give BusID for the primary one. The BusID of the second one is guessed.
So, i you are encountering problems, Use nvidia-settings to create a valid xorg.conf file and make sure you have a BusID line iin your "device" section.