Can you please test using the .debs here?
http://people.ubuntu.com/~bryce/Testing/ati/
The version of -ati currently in Gutsy and Feisty do not have randr 1.2
support for allowing projector hotplugging. The 6.7.192 -ati does have
xrandr 1.2 for things like projector hotplugging, and we're evaluating
inclusion of it into Gutsy. So your testing feedback of this would be
quite valuable.
** Changed in: xserver-xorg-video-ati (Ubuntu)
Importance: Undecided => Wishlist
Status: New => Confirmed
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Radeon Mobility 7500 does not detect video projector
https://bugs.launchpad.net/bugs/135463
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