Originally Posted by AaronP
The ConnectedMonitor and CustomEDID options apply to an entire GPU, so specifying different values for the different screens on a single GPU can lead to unexpected and confusing results. To make sure things work the way you want, you should probably specify the same things for both screens:
Option "ConnectedMonitor" "DFP-0, DFP-1"
Option "CustomEDID" "DFP-0: /etc/X11/MS_0025.bin; DFP-1: DFP-1:/etc/X11/acer.bin"
Also, UseDisplayDevice "DFP" doesn't make a whole lot of sense when both of your connected displays are DFPs. You should specify either DFP-0 or DFP-1 (or just remove the UseDisplayDevice option entirely).
The thing is, for kubuntu to work on my laptop LCD, I had to define a custom EDID for that screen (a known bug with ubuntu and nvidia's 195 drivers I guess). I'm going to try the double custom EDID when I get home tonight.
I would also like to mention that nvidia-settings doesn't detect the external monitor UNLESS I disable the laptop LCD in the xorg.conf. Then it detects it as DFP-1.