The recent windows 8.1 upgrade during the week of 2/8/2015 broke the ability to duplicate screens on my Envy dv6 and a Hannspree LCD. There is no screen on the Hannspree while it does remain on the dv6. Switch to external screen only and the screen does display on the Hannspree. Switch to extend and the dv6 remained the primary screen, and the Hannspree can only show the screen saver.
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