Relevant section of the multi-monitor specification:

"When the laptop lid is closed, the internal panel is disabled,
automatically setting the external monitor as the Primary display and
moving all windows from the internal panel across. A power-on signal is
also sent to the external display (through the H-sync and V-sync pins:
as specified in the VESA DPMS spec), to ensure that it is awake."

https://docs.google.com/a/canonical.com/document/d/1aHvJ-iIw-
59bXTYBmIhQqEx0za2h9jpFE_RhZ2VOvJc/edit?authkey=CJO5wPkH&hl=en_GB#heading=h.ybfxpw1z2cud

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https://bugs.launchpad.net/bugs/921313

Title:
  closing laptop lid while connected to an external display does not
  disable the laptop screen

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