More evidence, of a rather confusing nature.
With default /etc/systemd/logind.conf (which has everything commented out).

With only the laptop display
Unity and VT both suspend ok when lid is closed

With laptop display + external display
Neither Unity nor VT suspend when lid is closed.


With HandleLidSwitchDocked=suspend in /etc/systemd/logind.conf

With only the laptop display
Unity and VT both suspend ok when lid is closed

With laptop display + external display
Unity does not suspend the first time the lid is closed, but does the second, 
in fact it suspends every second time the lid is closed (though not absolutely 
sure this is completely consistent).  I think once it was not till the third 
time that it suspended.
VT suspends ok when lid is closed.

This is software so there is some sense there somewhere.   It is just a
matter of finding it.

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https://bugs.launchpad.net/bugs/1415958

Title:
  Laptop + external display does not suspend on lid close

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