Vários monitores com Intel GMA e Radeon HD 5450

Question

Eu tenho dois monitores, o primeiro monitor é conectado por D-sub à Radeon HD5450. Este monitor funciona bem. O segundo monitor é conectado por D-sub a Intel GMA (placa integrada integrada) e o sistema não pode detectar este monitor. Não consigo mudar o cabo de conexão. No Windows funcionou bem, mas no Linux não consigo resolver o meu problema.

Eu configurei no gráfico de inicialização do BIOS para o intel GMA, mas depois que o monitor de carregamento do sistema operacional mudará para o HD5450

lspci | grep VGA

00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller (rev 09)
01:00.0 VGA compatible controller: Advanced Micro Devices [AMD] nee ATI Manhattan [Mobility Radeon HD 5430 Series]

xrand

Screen 0: minimum 320 x 200, current 1280 x 1024, maximum 1280 x 1280
DFP1 disconnected (normal left inverted right x axis y axis)
DFP2 disconnected (normal left inverted right x axis y axis)
CRT1 connected 1280x1024+0+0 (normal left inverted right x axis y axis) 337mm x 270mm
   1280x1024      60.0*+   75.0  
   1280x960       75.0     60.0  
   1280x768       75.0     60.0  
   1280x720       75.0     60.0  
   1024x768       75.0     70.1     60.0  
   1024x600       75.0     70.1     60.0  
   800x600        72.2     75.0     60.3  
   800x480        72.2     75.0     60.3  
   640x480        75.0     72.8     59.9  

/etc/X11/xorg.conf

Section "ServerLayout"
        Identifier     "aticonfig Layout"
        Screen      0  "aticonfig-Screen[0]-0" 0 0
EndSection

Section "Module"
EndSection

Section "Monitor"
        Identifier   "aticonfig-Monitor[0]-0"
        Option      "VendorName" "ATI Proprietary Driver"
        Option      "ModelName" "Generic Autodetecting Monitor"
        Option      "DPMS" "true"
EndSection

Section "Monitor"
        Identifier   "0-CRT1"
        Option      "VendorName" "ATI Proprietary Driver"
        Option      "ModelName" "Generic Autodetecting Monitor"
        Option      "DPMS" "true"
        Option      "PreferredMode" "1280x1024"
        Option      "TargetRefresh" "60"
        Option      "Position" "0 0"
        Option      "Rotate" "normal"
        Option      "Disable" "false"
EndSection

Section "Device"
        Identifier  "aticonfig-Device[0]-0"
        Driver      "fglrx"
        Option      "Monitor-CRT1" "0-CRT1"
        BusID       "PCI:1:0:0"
EndSection

Section "Screen"
        Identifier "aticonfig-Screen[0]-0"
        Device     "aticonfig-Device[0]-0"
        DefaultDepth     24
        SubSection "Display"
                Viewport   0 0
                Depth     24
        EndSubSection
EndSection