Blank internal screen when waking with ext monitor connected

I have a 2011 MacBook pro that is connected to a Dell U2410 24" monitor all the time via a DVI adapter.
Most of the time this monitor is switched to a different input - the display port which is connected to my PC.
On the MBP I have display mirrorig enabled.
Usually, when I wake the MBP, I guess it dettect the external monitor (even when that input isnt selected for display) and leaves its own screen blank - which is really annoying as the only way I have found to get the internal display to come alive is diconnect the extermnal display, or switch inputs on my dell monitor so I can see the MBP display and select Detect Display from the screen utility in the system bar.
Is there any setting anyone know of to stop this behaviour and make the MBP allways enable the internal display if the lid is open rather than purely relying upon the external connector when waking to decide what to do?
Just really annoying.
BTW - for all those people who have been complaining about dead MBPs when you wake them and have an external monitor connected - are you sure this isnt what is happening to you? At first I though my MBP had crashed as well - but in fact it just hadnt switched its internal display back on.

Problem solved, with some help (here and here).
Basically, the solution was the installation of a new intel HD 4600 Graphics driver directly from intel.

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    #    Option     "MinX"          "231"
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    #    Option     "MinY"          "3858"
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    #    FontPath   "/usr/lib/X11/fonts/100dpi/:unscaled"
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    #    FontPath   "/usr/lib/X11/fonts/TrueType/"
    #    FontPath   "/usr/lib/X11/fonts/freefont/"
    #    FontPath   "/usr/lib/X11/fonts/75dpi/"
    #    FontPath   "/usr/lib/X11/fonts/100dpi/"
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    #    Option     "Protocol"      "Xqueue"
    #    Option    "Xleds"      "1 2 3"
    #    Option "LeftAlt"     "Meta"
    #    Option "RightAlt"    "ModeShift"
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    #    Option "XkbModel"    "pc105"
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    #    Option "XkbOptions"  "ctrl:swapcaps"
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    #    Option "XkbRules"    "xorg"
    #    Option "XkbModel"    "pc105"
    #    Option "XkbLayout"   "us"
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    #    Option "XkbOptions"  ""
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        Option        "AutoRepeat" "500 30"
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        Option        "XkbRules" "xorg"
        Option        "XkbModel" "pc104"
        Option        "XkbLayout" "us"
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    Section "InputDevice"
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    # the following line.
    #    Option "Protocol"    "Xqueue"
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    #    Option "Resolution"    "256"
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    #    Option "BaudRate"    "9600"
    #    Option "SampleRate"    "150"
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    #    Option "Emulate3Timeout"    "50"
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    #    Option "ChordMiddle"
        Identifier  "Mouse1"
        Driver      "mouse"
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        Option        "Device" "/dev/input/mice"
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        Option        "ZAxisMapping" "4 5 6 7"
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    EndSection
    Section "Monitor"
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    # HorizSync may be a comma separated list of discrete values, or a
    # comma separated list of ranges of values.
    # NOTE: THE VALUES HERE ARE EXAMPLES ONLY.  REFER TO YOUR MONITOR'S
    # USER MANUAL FOR THE CORRECT NUMBERS.
    #    HorizSync    30-64         # multisync
    #    HorizSync    31.5, 35.2    # multiple fixed sync frequencies
    #    HorizSync    15-25, 30-50  # multiple ranges of sync frequencies
    # VertRefresh is in Hz unless units are specified.
    # VertRefresh may be a comma separated list of discrete values, or a
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    # NOTE: THE VALUES HERE ARE EXAMPLES ONLY.  REFER TO YOUR MONITOR'S
    # USER MANUAL FOR THE CORRECT NUMBERS.
        Identifier   "My Monitor"
        HorizSync    30.0 - 62.0
        VertRefresh  50.0 - 70.0
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    Section "Monitor"
        Identifier   "aticonfig-Monitor[0]"
        Option        "VendorName" "ATI Proprietary Driver"
        Option        "ModelName" "Generic Autodetecting Monitor"
        Option        "DPMS" "true"
    EndSection
    Section "Device"
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    # the driver's chipset detection, and should not normally be specified.
    #    Chipset    "generic"
    # The Driver line must be present.  When using run-time loadable driver
    # modules, this line instructs the server to load the specified driver
    # module.  Even when not using loadable driver modules, this line
    # indicates which driver should interpret the information in this section.
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    # section can only match up with the primary video device.  For PCI
    # devices a line like the following could be used.  This line should not
    # normally be included unless there is more than one video device
    # intalled.
    #    BusID      "PCI:0:10:0"
    #    VideoRam    256
    #    Clocks    25.2 28.3
        Identifier  "Standard VGA"
        Driver      "vga"
        VendorName  "Unknown"
        BoardName   "Unknown"
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        # Insert Clocks lines here if appropriate
        Identifier  "* Generic VESA compatible"
        Driver      "vesa"
    EndSection
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        Driver      "fglrx"
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        Identifier "Screen 1"
        Device     "* Generic VESA compatible"
        Monitor    "My Monitor"
        DefaultDepth     24
        SubSection "Display"
            Viewport   0 0
            Depth     8
            Modes    "1280x800" "800x600" "640x480"
        EndSubSection
        SubSection "Display"
            Viewport   0 0
            Depth     16
            Modes    "1280x800" "800x600" "640x480"
        EndSubSection
        SubSection "Display"
            Viewport   0 0
            Depth     24
            Modes    "1280x800" "800x600" "640x480"
        EndSubSection
    EndSection
    Section "Screen"
        Identifier "aticonfig-Screen[0]"
        Device     "aticonfig-Device[0]"
        Monitor    "aticonfig-Monitor[0]"
        DefaultDepth     24
        SubSection "Display"
            Viewport   0 0
            Depth     24
        EndSubSection
    EndSection
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        FontPath    "/usr/share/fonts/X11/cyrillic"
        FontPath    "/usr/share/fonts/X11/100dpi/:unscaled"
        FontPath    "/usr/share/fonts/X11/75dpi/:unscaled"
        FontPath    "/usr/share/fonts/X11/Type1"
        FontPath    "/usr/share/fonts/X11/100dpi"
        FontPath    "/usr/share/fonts/X11/75dpi"
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        Load    "bitmap"
        Load    "ddc"
        Load    "dri"
        Load    "extmod"
        Load    "freetype"
        Load    "glx"
        Load    "int10"
        Load    "vbe"
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        Identifier    "Generic Keyboard"
        Driver        "kbd"
        Option        "CoreKeyboard"
        Option        "XkbRules"    "xorg"
        Option        "XkbModel"    "pc105"
        Option        "XkbLayout"    "us"
    EndSection
    Section "InputDevice"
        Identifier    "Configured Mouse"
        Driver        "mouse"
        Option        "CorePointer"
        Option        "Device"        "/dev/input/mice"
        Option        "Protocol"        "ImPS/2"
        Option        "ZAxisMapping"        "4 5"
        Option        "Emulate3Buttons"    "true"
    EndSection
    Section "InputDevice"
        Identifier    "Synaptics Touchpad"
        Driver        "synaptics"
        Option        "SendCoreEvents"    "true"
        Option        "Device"        "/dev/psaux"
        Option        "Protocol"        "auto-dev"
        Option        "HorizScrollDelta"    "0"
    EndSection
    Section "InputDevice"
        Driver        "wacom"
        Identifier    "stylus"
        Option        "Device"    "/dev/input/wacom"
        Option        "Type"        "stylus"
        Option        "ForceDevice"    "ISDV4"        # Tablet PC ONLY
    EndSection
    Section "InputDevice"
        Driver        "wacom"
        Identifier    "eraser"
        Option        "Device"    "/dev/input/wacom"
        Option        "Type"        "eraser"
        Option        "ForceDevice"    "ISDV4"        # Tablet PC ONLY
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    Section "InputDevice"
        Driver        "wacom"
        Identifier    "cursor"
        Option        "Device"    "/dev/input/wacom"
        Option        "Type"        "cursor"
        Option        "ForceDevice"    "ISDV4"        # Tablet PC ONLY
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    Section "Device"
        Identifier    "ATI Technologies Inc ATI Radeon XPRESS 200M 5955 (PCIE)"
        Driver        "ati"
        BusID        "PCI:1:5:0"
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    Section "Monitor"
        Identifier    "Generic Monitor"
        Option        "DPMS"
    EndSection
    Section "Screen"
        Identifier    "Default Screen"
        Device        "ATI Technologies Inc ATI Radeon XPRESS 200M 5955 (PCIE)"
        Monitor        "Generic Monitor"
        DefaultDepth    24
        SubSection "Display"
            Depth        1
            Modes        "1280x800"
        EndSubSection
        SubSection "Display"
            Depth        4
            Modes        "1280x800"
        EndSubSection
        SubSection "Display"
            Depth        8
            Modes        "1280x800"
        EndSubSection
        SubSection "Display"
            Depth        15
            Modes        "1280x800"
        EndSubSection
        SubSection "Display"
            Depth        16
            Modes        "1280x800"
        EndSubSection
        SubSection "Display"
            Depth        24
            Modes        "1280x800"
        EndSubSection
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    Section "ServerLayout"
        Identifier    "Default Layout"
        Screen        "Default Screen"
        InputDevice    "Generic Keyboard"
        InputDevice    "Configured Mouse"
        InputDevice     "stylus"    "SendCoreEvents"
        InputDevice     "cursor"    "SendCoreEvents"
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  • Retina Mac shows gray screen when waking up: what to do besides loosing work?

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