Here are testing steps

0. Link machine with external monitor via D-sub
1. Clean install oneiric
2. sudo apt-get update;sudo apt-get dist-upgrade
3. reboot and testing Fn+F3 and the behaviour is

    mirror mode -> mirror mode -> internal only -> external only

4. sudo apt-add-repository ppa:ayan/gnome-settings-daemon
5. sudo apt-get update;sudo apt-get dist-upgrade

    3 packages update: gnome-desktop3-data gnome-settings-daemon 
libgnome-desktop-3-2
    the version is 3.2.1-0ubuntu1.3~ayan1

6. reboot and testing Fn+F3 and the behaviour is

     when hit Fn+F3, the unity dash appear or disappear always, and
video mode is not changed.

Looks like the patch disable the super-p detection.

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https://bugs.launchpad.net/bugs/860436

Title:
  It appears two mirror mode while boot up with VGA/HDMI cable and then
  press FN+F3 to switch display mode

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