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[Peter Schüller <1300914@xxxxxxxxxxxxxxxxxx>]

I have the same problem. When I press "Detect Displays" in the displays
settings dialogue I get three "[drm:intel_dp_aux_native_read] *ERROR*
too many retries, giving up" lines in the syslog.

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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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