Originally Posted by AaronP
This will be fixed in a future driver release. Unfortunately, turning on Xinerama info when there's only one display device confuses a lot of (mostly older) software, so it may not be enabled by default, but the option will be there, at least.
I'm not sure if that's the case. Dynamic TwinView doesn't work properly without EDID infos on some monitors. But when it works, I can easily select the right resolution for both monitors and still get the same level of performance and behavior correctness of running programs.