Another way to reproduce, from the soon to be duplicate marked bug:
Steps to reproduce:
1) Boot outside of docking station, login
2) Suspend, close the lid
3) Put laptop in docking station
4) Resume with lid closed via docking station power button
Expected behaviour:
Login dialogue is displayed on external display
Actual behaviour:
External display stays black; ssh login to the system and killing gnome-screensaver restores access to the session.
Another way to reproduce, from the soon to be duplicate marked bug:
Steps to reproduce:
1) Boot outside of docking station, login
2) Suspend, close the lid
3) Put laptop in docking station
4) Resume with lid closed via docking station power button
Expected behaviour:
Login dialogue is displayed on external display
Actual behaviour:
External display stays black; ssh login to the system and killing gnome-screensaver restores access to the session.