It looks like X is detecting the three monitors okay, but it's hard to
say what xrandr commandline should be invoked to make everything work.
Could you attach the output of running `xrandr`?
Also, I wonder if some command such as this might make your system work
as you wish:
xrandr --output LVCD --off --output VGA-0 --auto --left-of DVI-0 --auto
** Changed in: xserver-xorg-video-ati (Ubuntu)
Status: New => Incomplete
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Unable to use xrandr for dual-head in hardy
https://bugs.launchpad.net/bugs/183873
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