Aha, I figured out how to reproduce it on my desktop:

Boot with the alternate CD, go through the installation until it has
reformatted the drive and started installing things to /target.  Next
`chroot /target`, then wait until the file
/usr/share/xresprobe/xprobe.sh is present, and then invoke it:

 /usr/share/xresprobe/xprobe.sh laptop

Boom, colored squares.

Essentially what this script is doing, is running

 /usr/bin/Xorg :67 -ac -probeonly -logfile "<logfile>" -config
"<config>"

using the xorg.conf from /usr/share/xresprobe/xorg.conf, with "intel"
specified as the driver.

So... one solution could be to disable running xprobe.sh for driver
"intel".  I've attached a patch for this.

However, I think this risks ending up with an improperly configured
graphics system.  Let me experiment more and see if I can come up with a
better solution.

** Attachment added: "Brute force patch to stop corruption on Intel laptops"
   http://launchpadlibrarian.net/9519070/xresprobe.patch

-- 
Alternate install of Tribe-4 corrupts video display when installing packages 
(affected hardware includes Santa Rosa)
https://bugs.launchpad.net/bugs/127008
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