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[Bug 1315369] Re: Log in not available after lock screen with multi-monitor

 

One more check to figure out where the problem might be:
 - Ctrl + Alt + F1
 - Login there and run:
     COMPIZ_CONFIG_PROFILE=ubuntu DISPLAY=:0 compiz --replace

At this point, go back with Ctrl+Alt+F7, and there unity should reload.
If it resumes your session properly then it seems an unity's fault.

You can also just run "unity" from tty1, but that will relock your
session. If compiz doesn't seem to reload try with a "killall -9 compiz"
before.

PS: if you want to lower the idle delay needed to blank and lock the screen for testing purposes you can use
  gsettings set org.gnome.desktop.session idle-delay 1 # means 1 second

Use this to reset the default values instead:
  gsettings reset org.gnome.desktop.session idle-delay

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https://bugs.launchpad.net/bugs/1315369

Title:
  Log in not available after lock screen with multi-monitor

Status in Unity:
  Incomplete
Status in “unity” package in Ubuntu:
  Incomplete

Bug description:
  After the screen locks I am unable to log back in because the screen
  with the login prompt is black, and the screen on my laptop just shows
  the Ubuntu logo.

  Furthermore, if I then unplug the external monitor (in an attempt to
  force the log in option to be displayed on the laptop)  the laptop
  screen then goes black and I can't do anything at all.

  I can't reproduce this if I select "lock screen" from the UI, but it
  happens reliably if it locks due to inactivity.

  Other info:
  - I am running a fresh install of 14.04
  - I have it set to lock after 5 min of inactivity, and require login after lock
  - I have an external monitor, configured to be on the left side of the laptop screen

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References