aiuto con mythbuntu e dual monitor

[gino46]

Salve ho installato mythbuntu 8.04 beta, configurata e funzionante a dovere, mi manca solamente di far funzionare anche il secondo monitor, cosa che non riesco a fare.

Monitor lcd: Dell 20" 1680x1050
Tv lcd: Sony bravia 1366x768

Questo è il mio xorg.conf (che ovviamente non funziona più e mi dice che il server x gira ad una risoluzione troppo bassa)
Cosa sto sbagliando che non capisco?

Section "InputDevice"
        Identifier      "Generic Keyboard"
        Driver          "kbd"
        Option          "XkbRules"      "xorg"
        Option          "XkbModel"      "pc105"
        Option          "XkbLayout"     "it"
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 "Device"
        Identifier      "Configured Video Device"
        Boardname       "Intel 945"
        Busid           "PCI:0:2:0"
        Driver          "i810"
        Option          "DevicePresence"        "On"
        Screen  0
        Vendorname      "Intel"
        Option          "MonitorLayout"         "CRT, CRT+LFP"
        Option          "Clone"                 "on"
EndSection

Section "Monitor"
        Identifier      "Sony"
        Vendorname      "Plug 'n' Play"
        Modelname       "Plug 'n' Play"
        VertRefresh     60
EndSection

Section "Monitor"
        Identifier      "Dell"
        ModelName       "External Device"
        VertRefresh     60
EndSection

Section "Screen"
        Identifier      "Sony-screen"
        Monitor         "Sony"
        Device          "Configured Video Device"
        Defaultdepth    32
        SubSection "Display"
                Depth   32
                Modes           "1360x768@60"
        EndSubSection
EndSection

Section "Screen"
        Identifier      "Dell-screen"
        Monitor         "Dell"
        Device          "Configured Video Device"
        Defaultdepth    32
        SubSection "Display"
                Depth   32
                Modes           "1360x768@60"
        EndSubSection
EndSection

Section "ServerLayout"
        Identifier      "Multihead"
        screen 0        "Sony-screen" 0 0
        screen 0        "Dell-screen" 0 0
EndSection

Section "Module"
        Load            "glx"
        Load            "GLcore"
        Load            "dri"
        Load            "v4l"
EndSection

Section "DRI"
        Mode 0666
EndSection