Sounds like this is the magic bit:
SubSection "extmod"
Option "omit xorg-dga" # don't initialise the DGA extension
EndSubSection
Could you please test this clean xorg.conf, which is a current stock
xorg.conf just with the above bit added? If it makes it work, then we
can forward this upstream for more advice. (Maybe it needs a quirk)
** Attachment added: "xorg.conf"
http://launchpadlibrarian.net/17768969/xorg.conf
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xorg.conf is not configured correctly for a Compaq Presario 1800T laptop
https://bugs.launchpad.net/bugs/16842
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