screen display not saved after reboot

[Jean-Sébastien Frerot]

I have a DELL E6430 laptop with docking station. I can successfully setup a 3 monitor extended desktop (1 built-in laptop monitor + 2 external monitor with DVI) using "Screen Display" control panel in Ubuntu trusty. When I reboot the 3 monitors are activated but not in the right order. They are mixed up. I have to change the settings again to make it right but it's never *saved* as I have to do that at every boot.

Description: Ubuntu Trusty Tahr (development branch)
Release: 14.04

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: gnome-control-center 1:3.6.3-0ubuntu54
ProcVersionSignature: Ubuntu 3.13.0-22.44-generic 3.13.8
Uname: Linux 3.13.0-22-generic x86_64
ApportVersion: 2.14-0ubuntu1
Architecture: amd64
CurrentDesktop: GNOME
Date: Thu Apr 3 09:04:27 2014
ExecutablePath: /usr/bin/gnome-control-center.real
InstallationDate: Installed on 2014-01-14 (79 days ago)
InstallationMedia: Ubuntu-GNOME 13.10 "Saucy Salamander" - Release amd64 (20131017)
ProcEnviron:
 LANGUAGE=en_CA:en
 PATH=(custom, user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_CA.UTF-8
 SHELL=/bin/bash
SourcePackage: gnome-control-center
UpgradeStatus: Upgraded to trusty on 2014-02-21 (40 days ago)
usr_lib_gnome-control-center: deja-dup 30.0-0ubuntu3