Comment 3 for bug 1378177

Oh, didn't notice your system was 14.04. We've been seeing almost the same exact bugs coming in for 14.10.

That said, I still don't think this is a Unity issue as Unity doesn't have anything to do with turning off the screen. Unfortunately, I'm not sure which package to file this under. It could be a unity-settings-daemon issue or even a kernel issue. I'll leave it opened for now with the idea that someone may know where to re-file this.