This issue affects me as well.  Lenovo T460 and a Lenovo basic docking
station.  The docking station is connected to an Acer 24" monitor via
VGA.  Once the desktop locks and the unity login appears the external
display enters power save mode.  Unlocking via the password does not
power up the external display (all windows are moved to laptop display).
I have to eject the laptop from the dock, wait a couple of seconds, then
put the laptop back in the dock for the external display to power back
up.  I'd prefer not to physically undock/dock the laptop several times a

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  [dp] External Screen doesn't wake up from sleep

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