Linux Mint 13 XFCE freezes when external monitor connected

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http://unix.stackexchange.com – I am running Linux Mint 13. The problem is that whenever I connect/disconnect an external monitor to my laptop it freezes. If the monitor is connected on boot it works fine. Any ideas ? Output from inxi -SGxc 0 System: Host: ****-VGN-NS140E Kernel: 3.2.0-23-generic x86_64 (64 bit, gcc: 4.6.3) Desktop: Xfce 4.10.0 (Gtk 2.24.10) Distro: Linux Mint 13 Maya Graphics: Card: Intel Mobile 4 Series Chipset Integrated Graphics Controller bus-ID: 00:02.0 X.Org: 1.11.3 drivers: intel (unloaded: vesa,fbdev) Resolution: [email protected] GLX Renderer: Mesa DRI Mobil (HowTos)