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I have a triple monitor setup with a 1920x1200 monitor in the middle and two rotated 1600x1200s on the sides, for a total requirement of 4320x1600. I recently installed xubuntu and I'm trying to use xrandr to set this up, and can't figure out how to do it. I always get an error as follows, whatever I try (root, using 1:1 resolutions and creating an xorg.conf file and putting a Virtual line in it all don't work).

X@X:~$ xrandr --fb 4320x1600
xrandr: screen cannot be larger than 4096x4096 (desired size 4320x1600)

If it matters I'm using two GeForce 7300 GS with two monitors on DVI and one on VGA. All three monitors show up and I can enable any combination of two at once just fine. Thanks for the help!

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You'll need to find the correct Screen-Display SubSection in your existing xorg.conf and add the Virtual entry. If the entry does not exist, you'll need to create the rest of your configuration as well.

Section "Screen"
  …
  SubSection "Display"
    Depth 32
    Virtual 8192 8192
  EndSubSection
EndSection

See http://x.debian.net/howto/use-xrandr.html for more details. Beware that some graphics drivers may have hardcoded virtual size limits.

(Added by myself, authentication didn't pick up, so shown as anonymous modification)

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