Kubuntu: Laptop screen locked in HDMI-cable-connected-modus

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During boot the KDE startup screen seems to lock on the laptop. Only when I plug in the HDMI cable, the laptop screen starts functioning again. But when I unplug the HDMI cable, the laptop screen turns black.


  • Kubuntu-14.04
  • Laptop Lenovo Thinkpad S540


Somehow the laptop screen failed to restore itself after disconnecting the HDMI cable. Solution was to lookup the laptop screen name via:


In my case this was 'eDP1'. Then I typed in a console:

xrandr --output eDP1 --auto

and pressed Enter after having unplugged the HDMI cable, so with a black laptop screen.