Comment 2 for bug 1374830

Hey, thanks for the bugreport and the detailed information, but don't set HandleLidSwitch=ignore in logind.conf, because the black screen bug's fix works with leaving things to logind.

So basically you've reproduced here that xfce4-power-manager's method of suspending plus locking the session doesn't work well with light-locker (or more concretely: VT switching), which we also established before patching 14.04.1.