Comment 12 for bug 1307545

I can confirm the same behaviour. Computer goes to StandBy when lid is closed after awakening the screen keeps black.

 xfce4-power-manager 1.2.0-3ubuntu4.1 is installed and no work around is applied.

I deinstalled light-locker and installed xscreensaver again but the same problem occurs. When I deinstalled both I can not lock the screen anymore.