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[Peter Schüller <1300914@xxxxxxxxxxxxxxxxxx>]

The behavior changed and I again checked several kernel versions and
found an important difference:

* 46 shows lightdm greeter (password input) on internal and external
monitor and after starting the session (login) the external monitor is
deactivated but I can reactivate it (switch between
internal/external/internal+external monitor) using the appropriate Fn+F
key combination to make the session visible on the external monitor.

* 48, 49, 52, 51 shows lightdm greeter (password input) on internal and
external screen but after starting the session (login) the external
monitor stops working and Fn+F does not activate it again. Logging out
again shows the lightdm greeter on both monitors but once in the session
it is impossible to get the external monitor working except for logging
out.

The only difference in behavior is the kernel version. At the moment
only kernel 46 is usable.

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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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