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I have dual-booted Xubuntu with Windows 7. In both the previous Xubuntu (13.04, did a clean install of 13.10) and Windows 7 I managed to get my triple monitor setup working. I have two Radeon HD6870's. In one there is only one DVI-cable to my main monitor, which is detected and the other GPU, with two DVI-cables are not detected. However both the GPU's are detected.

$ lspci | grep VGA
01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Barts XT [Radeon HD 6870]
02:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Barts XT [Radeon HD 6870]

$ xrandr
Screen 0: minimum 320 x 200, current 1920 x 1200, maximum 16384 x 16384
DFP1 disconnected (normal left inverted right x axis y axis)
DFP2 disconnected (normal left inverted right x axis y axis)
DFP3 disconnected (normal left inverted right x axis y axis)
DFP4 disconnected (normal left inverted right x axis y axis)
DFP5 disconnected (normal left inverted right x axis y axis)
DFP6 disconnected (normal left inverted right x axis y axis)
DFP7 disconnected (normal left inverted right x axis y axis)
DFP8 disconnected (normal left inverted right x axis y axis)
DFP9 disconnected (normal left inverted right x axis y axis)
DFP10 disconnected (normal left inverted right x axis y axis)
DFP11 connected 1920x1200+0+0 (normal left inverted right x axis y axis) 518mm x 324mm
   1920x1200      60.0*+
   1920x1080      59.9  
   1600x1200      59.9  
   1680x1050      59.9  
   1400x1050      59.9  
   1600x900       59.9  
   1360x1024      59.9  
   1280x1024      60.0  
   1440x900       59.9  
   1280x960       59.9  
   1280x800       59.9  
   1280x768       59.9  
   1280x720       59.9  
   1024x768       59.9  
   800x600        59.8  
   640x480        59.8  
CRT1 disconnected (normal left inverted right x axis y axis)

As for Xorg.conf, made using sudo aticonfig --initial=dual-head:

Section "ServerLayout"
    Identifier     "aticonfig Layout"
    Screen      0  "aticonfig-Screen[0]-0" 0 0
    Screen         "aticonfig-Screen[0]-1" RightOf "aticonfig-Screen[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   "aticonfig-Monitor[0]-1"
    Option      "VendorName" "ATI Proprietary Driver"
    Option      "ModelName" "Generic Autodetecting Monitor"
    Option      "DPMS" "true"
EndSection

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

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

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

Section "Screen"
    Identifier "aticonfig-Screen[0]-1"
    Device     "aticonfig-Device[0]-1"
    Monitor    "aticonfig-Monitor[0]-1"
    DefaultDepth     24
    SubSection "Display"
        Viewport   0 0
        Depth     24
    EndSubSection
EndSection

I have both amdcccle and fglrx installed. Crossfire is off.

Pretty much the same as: Xubuntu does not recognise second identical ATI graphics card But his question wasn't answered.

Any tips or suggestions? Would I need a new GPU just for this?

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