Re: NVidia and XRandR 1.2
There may be some confusion here. RandR 1.2 and the Xinerama extension (the real one that glues together multiple X screens) aren't compatible with each other. The RandR 1.2 code has its own implementation of the Xinerama extension (which some people refer to as, "Fakerama"), which it uses to report the position of the CRTCs to clients. This is similar to the X driver's TwinViewXineramaInfo option.