I like to use my laptop's internal display as a secondary display with the laptop hooked up to a monitor over HDMI (that being the primary display). This works well, but I've run into one little problem - when I close and reopen my laptop lid, I'm stuck at a black screen and have to cut power and reboot. Closing the lid and leaving it closed works fine - the internal display turns off and I can continue to use my monitor. But as soon as I open the laptop lid, the internal display lights up but stays black and my monitor loses signal. What's wrong here/how can I fix it?
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