I'm having a similar problem with my U2711 display over display port from my Lenovo X1 Carbon laptop. Monitor seemed to work fine for quite a while when I first bought it... over the past few months the flickering and then the display will go black seems to have gotten worse. I've downloaded and loaded the latest drivers (and manually pointed the monitor to that driver... since there is no wizard to do it) and the flickering is still occuring.
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