I switched the lid close event to blank screen for both on AC/on battery
(via Power Management Preferences).

Now, when I close the lid, the display switches over to external but
does not blank the screen. Upon reopening the display switches back to
internal but an error notification appears (something about virtual
size, disappears too fast to read).

I don't know if this auto-switching to external screen on lid close is
expected or not. I think it should not happen if lid close is associated
with suspend, because it makes no sense to switch the screen if the
computer is going to sleep anyway.

-- 
Active screen changes when suspending by lid close
https://bugs.launchpad.net/bugs/379008
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