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[Jean-Christophe Baptiste <jc@xxxxxxxxxxx>]

The simple fact to switch to a TTY reactivate the screen. There are also no issues in other windows managers than Gnome (e.g. Openbox), xrandr works well. So probably neither an Xorg nor a driver issue.
It seems to be Gnome-related.


** Tags removed: kernel-bug-exists-upstream

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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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