Comment 19 for bug 1259339

I can also confirm this behaviour in Xubuntu 14.04. The remedy is the same for comment #18 (fv).
I did not have this problem for 13.10 or 13.04.

Interestingly, when I switch off Light Locker and rely on Power Manager to suspend the laptop when closing the lid, the screen is restored okay. (But for some reason the Display settings window is now visible..!?)

This leads me to think that the issue is with Light Locker, and not Power Manager. (Although is Power Manager responsible for the mysterious appearance of the Display settings window on resume..??)

In my opinion, this is one example of a very visible bug that will affect many people. It should be fixed with a high priority, especially with it affecting an LTS release.