Public bug reported:

When using compiz on a dual monitor setup I get a dead lock in the X
server when my cursor moves past the outside of the smaller monitor. My
setup is a LVDS 1920x1200 and an external LCD connected to the VGA port
at 1680x1050. When I move outside of the 1680x1050 area the X server
dead locks.

This is a known bug and has been fixed in the xorg ATI driver.

See freedesktop.org report https://bugs.freedesktop.org/show_bug.cgi?id=13005
See ArchLinux report http://bugs.archlinux.org/task/8573
Diff at 
http://gitweb.freedesktop.org/?p=xorg/driver/xf86-video-ati.git;a=commitdiff;h=d41d73f5f9d8baee7137e94da2c7852ea0412180;hp=aaafc6a8f33d4736c37c43d3fd5e43085a2590fb
ArchLinux report also references diff 
http://gitweb.freedesktop.org/?p=xorg/driver/xf86-video-ati.git;a=commitdiff;h=37af2f6b52c8f217b205486742a6b46a864da8ed

** Affects: xserver-xorg-video-ati (Ubuntu)
     Importance: Undecided
         Status: New

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compiz dead locks for dual monitor setup using ati driver 6.7.195
https://bugs.launchpad.net/bugs/174425
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