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[André Rummler <1300914@xxxxxxxxxxxxxxxxxx>]

I get the same with HP Elitebook 840, Ubuntu 14.04.02, kernel 3.13.0-52-generic. Each time I plug in the VGA cable of my new Asus screen (no fitting HDMI cable at home) there is a 
[drm:intel_dp_aux_native_read] *ERROR* too many retries, giving up
message in syslog and it is not detected.

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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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