I think the diagnosis is that the monitor is connected to intel HD 4600 and the Nvidia 750M is a piggyback. I have emailed Dell to find out.
it is a shame because nvidia control centre has more options for connecting to say a TV. and now we have the double whammy of an extra GPU sucking power albeit at idle, without the benefits. maybe I should buy a game to utilise the NVidia haha. [hmm I should benchmark this thing to see what weird results it would show!]
but i don't plan to connect my laptop to a TV. but hey you never know, hence it could be handy one day. i can live with waking up the laptop twice. just an annoyance rather than anything else.
but i do expect more from a high end laptop :D
i am going to post the final result in my review thread to warn other buyers.