Comment 12 for bug 279406

This is working as intended originally, though perhaps the intention should change. What happens is that when you press the power button, if there has been keyboard or mouse activity recently, it opens in the background so you don't accidentally select one of the options. I'm not sure what the rationale is here exactly, perhaps that this dialog can be triggered automatically in some conditions, or that some power buttons are easily accidentally pressed, and so if you are in the middle of clicking or typing when this happens, you will shutdown/restart/etc unintentionally and perhaps lose data.

Perhaps it should not perform this check and always come to the front. This is almost definitely a dupe of an older bug in which the behavior has been explained but I can't find it at the moment.