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[glarrain <1300914@xxxxxxxxxxxxxxxxxx>]

This issue affects me too (Ubuntu GNOME 14.04 on a Macbook Pro 11.1).
With Ubuntu GNOME 13.10 it didn't.

Hereby attached is a log file with two kind of messages:
* [...] [drm:intel_dp_i2c_aux_ch] *ERROR* too many retries, giving up
* [...] [drm:intel_dp_aux_native_read] *ERROR* too many retries, giving up

** Attachment added: "bug.log"
   https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1300914/+attachment/4133492/+files/bug.log

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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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