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Turn display off when using external?


I plan on using my SP2 to play movies via DP>HDMI on a TV every now and then... in a desire to preserve battery life, is there any way to turn off the SP2's display while still playing the movie on the other screen? I've never been faced with this before as I don't use portable devices like this much.
Will the display scaling also automatically switch from 150% to 100%?