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dell xps 15 monitor flickering after connecting external usb monitor

Hi, all, I have a Dell XPS 15 laptop and recently bought a Asus MB169B external USB monitor.  When I plug the monitor in, the laptop monitor (not the external monitor) flickers about every half second.  If I unplug it, it stops.  I upgraded my video driver to no avail.

Is it simply a power supply issue (the external monitor  does not have a power cord)?  Anything I can do?  It does it even if I have the laptop plugged in and charging.  

*something interesting - I just discovered if I duplicate the display and not extend the flickering goes away...but that kind of defeats the point of a dual monitor for me.

Thanks.


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