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I have a Dell Inspiron 15R with Intel® Ivybridge Mobile Graphics. I upgraded to Ubuntu vanilla and the latest version (16.04) few days back. Each time I close the laptop lid with the power source plugged in, and reopen it, a blank screen appears. A forced restart using the hardware button is necessary at this point. If the lock screen is activated, after a time it goes black. Even when on plugged on or on battery, if unused or locked, the same happens and a manual reboot is required for it to start. The CPU is running but I cant get to the login screen

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    @Videonauth This question is wrongly marked as a duplicate! The linked question asks about not being able to suspend by closing the lid. This one asks about blank screen after resuming.
    – Petr
    Oct 1, 2016 at 7:24

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Seems to match something I've seen already for 14.04:

https://bugs.launchpad.net/ubuntu/+source/xubuntu-default-settings/+bug/1303736

File a new bug, and for now try the workaround from here:

map some key combination to: xrandr --auto and you'll get your screen back by pressing it.

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