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When executing this list of commands:

xrandr --output DFP3 --mode 1680x1050 --rate 60
xrandr --output CRT1 --mode 1680x1050 --rate 59
xrandr --output DFP3 --left-of CRT1 (error here)
xrandr --output CRT1 --primary

I have this output:

xrandr: screen cannot be larger than 1680x1680 (desired size 3360x1050)

I looked up and they recommended me to add a line in xorg.conf adding Virtual 3360x1050 to the Display subsection. I added it and made a reboot but I have the same error. Here is my 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 "Device"
    Identifier  "aticonfig-Device[0]-0"
    Driver      "fglrx"
    BusID       "PCI:1:0:0"
EndSection

Section "Screen"
    Identifier "aticonfig-Screen[0]-0"
    Device     "aticonfig-Device[0]-0"
    Monitor    "aticonfig-Monitor[0]-0"
    DefaultDepth     24
    SubSection "Display"
        Virtual 3360 1050
        Viewport   0 0
        Depth     24
    EndSubSection
EndSection
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This seems to be your monitor sized bigger. Do you have more information about where you installed it? on Windows 7, XP, or Vista using Wubi, CD (burned), Virtual PC/VMware/VM Workstation, or Ubuntu Installer CD (Orignal) Please answer so we can identify your problems. Don't forget the specs of your Computer so we can identify if there's incompatible to install Ubuntu. –  jd434 Jun 2 '13 at 6:05
    
It is a Xubuntu install, using it as my main OS. And the size of the display is OK and has nothing to do with the problem. –  Pacha Jun 2 '13 at 6:07
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1 Answer

I had the same issue and discovered that I had to extend the height as well as the width to make it work (thanks to ThomasKl's edit to his answer for this question).

Try

Virtual 3360 3360

in the Display subsection.

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