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[Nick Demou <ndemou@xxxxxxxxxx>]

Today it happened to me again and after unplugging and replugging the
monitor 10 times it worked!!!

It almost makes me feel it must be a HW issue but: 
 - I'm using two different displayport adapters (DP to VGA at home DP to HDMI at work)  
 - it never ever happened during a powering on (have powered up my laptop at least 20 times after this issue begun)
 - a reboot *always* fixes the problem (have tried it at least 10 times)

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https://bugs.launchpad.net/bugs/1300914

Title:
  External screen undetected after first plug

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  On Ubuntu 14.04, the external screen plugged on VGA is detected and get activated correctly.
  However, if I unplug it and then replug it later, it is not detected anymore and the screen receives no signal.

  A way to get it back to work is to reboot or simply suspend the
  computer.

  Sorry but I have no idea of what package is handling that.

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