Public bug reported:

I'm using Precise Pangolin installed from scratch, with the latest
updates.

  txelu@txelu-acer:~$ lsb_release -rd
  Description:  Ubuntu 12.04 LTS
  Release:      12.04

My problem is that I have my laptop connected to an external monitor, and if I 
started Ubuntu with the lid open I can't close, because not only the laptop 
screen goes blank, but also the external monitor.
As a curious detail if I close the lid right after switching on the laptop, 
before Ubuntu starts up, it works as expected.
Of course, I have set the Energy configuration to do nothing on closing the 
lid, and I agree that the laptop screen in that situation should go black, but 
not the external screen.
There is a similar bug filled against previous versions of Ubuntu (#416236) 
that was considered a regression, but in that case there was a workaround using 
gconf-editor to manually edit the settings for the gnome-power-manager, but 
there is no such a entry now in 12.04.

** Affects: ubuntu
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1012277

Title:
  Closing laptop lid should not blank external monitor

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