Wow, I'm amazed this works at all.

In general, Xrandr 1.2 and xserver 1.4 do not support multi-head using
two different video cards with separate screens.  This requires TTM to
make it work which should (knock on wood) hit for Intrepid.  We will be
upgrading all the Xorg components in Intrepid over the next few weeks,
so perhaps the best thing to do would be to wait and try again in 2-3
weeks.

When you're brought back to the login prompt, my guess is that this is
due to X crashing because the configuration is not quite valid.  I would
suggest getting a backtrace, but I'm fairly sure upstream would just ask
us to use the newer x bits.

You *might* be able to get this working using pure Xinerama, however to
do this you'll need to revert from "intel" to "i810".  I don't know much
about the "sisusb" driver and whether it supports Xinerama or Xrandr.
If it's an Xrandr driver, then I am fairly sure you'll just need to wait
for the new TTM stuff to arrive.

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sisusbvga USB to VGA device not being detected and automatically configured
https://bugs.launchpad.net/bugs/224479
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