sounds like kernel 4.4.0-22.38 will fix this on 16.04, as it has merged
4.4.8
** Package changed: xorg (Ubuntu) => linux (Ubuntu)
** Changed in: linux (Ubuntu)
Status: Confirmed => Fix Committed
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https://bugs.launchpad.net/bugs/1559308
Title:
Plugging HDMI screen in causes system hang
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