Frustrated that displays have stopped working.
I have Latitude E6440, e-port plus II and two Dell monitors: Dell P2415Q and Dell S2340T.
Both monitors were working, P2415Q connected from replicator Video 1 DataPort to Mini DataPort and the S2340T connected from replicator Video 2 DataPort to DataPort, but for no apparent reason the P2415Q has stopped working with DataPort to Mini DataPort or DataPort to DataPort In.
I can get P2415Q to work directly with the Latitude e6440 from HDMI to HDMI, but the replicator doesn't have HDMI.
Why did it stop working! Aaaarghhghh!! Help!
I'm not positive about this behavior since in order to make the Intel graphics controller work with a 3 display configuration your computer (laptop) requires to have 1 Display port or 1 embedded display port as minimum requirement.
This link might help you How to configure three (3) displays on a Dell Latitude Portable with Intel HD 4x00 Graphics | Dell US.
For further reference Configuration 3 Displays FAQ for Graphics Drivers.