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I had 11.10 64bit, I upgraded to 12.04

if I change the settings in the Display it will freeze .
-  if I move the external monitor  to the left of laptop monitor , (or above 
it) it will freeze
 - if I try to turn of the laptop monitor ,so I only have my external monitor 
it will freeze again.

the mouse wont move and I have to reset the computer by ALT PRINT K to
come back to ubuntu

dual monitor used to work fine in ubuntu 11.10 , is there any way to downgrade 
the Display program to the one in 11.10 ?
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ApportVersion: 2.0.1-0ubuntu7
Architecture: amd64
DistroRelease: Ubuntu 12.04
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release amd64 (20110427.1)
Package: linux (not installed)
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: linux-meta
Tags:  precise precise
Uname: Linux 3.3.0-030300rc5-generic x86_64
UnreportableReason: The running kernel is not an Ubuntu kernel
UpgradeStatus: Upgraded to precise on 2012-05-01 (0 days ago)
UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare vboxusers

** Affects: xorg-server (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: xorg-server
     Importance: High
         Status: Fix Released

** Affects: linux (Ubuntu)
     Importance: Medium
         Status: Incomplete


** Tags: apport-collected freeze kernel-bug-exists-upstream needs-kernel-logs 
needs-upstream-testing precise ubuntu
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Dual Monitor Freeze after changing Display Settings in ubuntu 12.04
https://bugs.launchpad.net/bugs/992778
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