Done some more looking into this. Turns out it only happens when:
System is booted without external monitor connected, then made to sleep, 
connected to external monitor while sleeping, then woken.

If the system is originally booted while connected to the external
monitor, then it can be connected to an external monitor while sleeping,
and this problem will not occur.

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https://bugs.launchpad.net/bugs/780648

Title:
  Fail to repaint screen when external monitor attached while sleeping

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