This past Thursday was the first presentation I needed to give from my laptop
since upgrading to Edgy. I played with my X settings a LOT in advance to make
sure everything would go smoothly. I never got xinerama working correctly, so
I opted to go for just having two screens instead of a xine
I have exactly the same problem with my dual-head configuration for my
intel i855GM on a Compaq Presario V2000 (config attached).
** Attachment added: "x configuration file for dual-head xinerama with i810"
http://librarian.launchpad.net/4964892/xorg.conf
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xinerama broken on upgrade dapper