For the virtual desktop you could get away with "Virtual 1024 1536"

Are you trying to clone the internal monitor or have an extended
desktop?

I have a similar setup to yours (except I have the misfortune of an x1400; what 
a pain!) and the following works to get my external monitor working as an 
extended desktop:
xrandr --output VGA-0 --mode "1024x768"
xrandr --output LVDS --left-of VGA-0

In my experience, xrandr -q provides more modes than those defined in
xorg.conf so that you may dynamically set the mode to a wide range of
sane possibilities.  On a default hardy install the above worked for me
(I used other resolutions as well)

Another thing you probably have already checked is that your monitor is
looking for a signal on the right input.  My monitor switches back to a
digital input when an analog signal is absent.  I have to manually
switch to VGA for my monitor to recognize a VGA signal if I have used
DVI.

Good luck!

-- 
open source ati driver in hardy can't do external monitor on laptop
https://bugs.launchpad.net/bugs/222905
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