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Monitors connected with HDMI goes black and back again randomly.


I have a Latitude E6440 with an Intel HD Graphics 4600 video card and I have noticed that when the power cord is connected the monitor connected with HDMI goes black and back again randomly. This usually happens several times per minute. 

I have both tried with another HDMI cable and monitor but with the same result.

This never happens when the laptop is running on batteries.

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