could you try a mainline kernel from here:
http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.3-rc6-precise/
** Package changed: xorg (Ubuntu) => xserver-xorg-video-ati (Ubuntu)
** Changed in: xserver-xorg-video-ati (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/946589
Title:
Xorg crashes in Precise with Dual Screens
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