The situation seems to be improved with the 4.2 kernel in the 
canonical-kernel-team ppa:
$ cat /proc/version_signature 
Ubuntu 4.2.0-6.6-generic 4.2.0-rc8

I have suspended and resumed several times with the external monitor
coming up properly and have not (yet) seen this bug with this kernel.

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https://bugs.launchpad.net/bugs/1467602

Title:
  after screenlock and screen suspend, external display port monitor
  doesn't resume properly

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