Public bug reported:

Today when I connect to external display (both from suspend or when the
laptop is running), display freezes with random colors on it. Neither
keyboard or mouse is responsive. Even Ctrl-Alt-Backspace does not work.
I could only reboot using kernel command SysRq-reisub.

Last week there was no such problem (till Mar 24, 2012, and in the past
two days I have not tested it). Thus it may be a problem of some
recently updated packages.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: xorg 1:7.6+12ubuntu1
ProcVersionSignature: Ubuntu 3.2.0-20.32-generic 3.2.12
Uname: Linux 3.2.0-20-generic x86_64
NonfreeKernelModules: wl
.tmp.unity.support.test.0:
 
ApportVersion: 1.95-0ubuntu1
Architecture: amd64
CompizPlugins: 
[core,composite,opengl,compiztoolbox,decor,vpswitch,imgpng,resize,gnomecompat,unitymtgrabhandles,grid,obs,move,place,mousepoll,wall,snap,regex,animation,expo,ezoom,workarounds,fade,session,scale,opacify,unityshell]
CompositorRunning: compiz
Date: Mon Mar 26 11:53:02 2012
DistUpgraded: Fresh install
DistroCodename: precise
DistroVariant: ubuntu
ExtraDebuggingInterest: Yes, if not too technical
GpuHangFrequency: Continuously
GpuHangReproducibility: Yes, I can easily reproduce it
GpuHangStarted: Today
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Alpha amd64 (20120319)
MachineType: Dell Inc. Studio 1557
ProcEnviron:
 LANGUAGE=en_CA:en
 TERM=xterm
 PATH=(custom, user)
 LANG=en_CA.UTF-8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-20-generic 
root=UUID=9fe5383f-0bfd-4b1a-9d51-8c9deb76eba0 ro quiet splash vt.handoff=7
SourcePackage: xorg
Symptom: display
Title: Xorg freeze
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 03/02/2010
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A04
dmi.board.name: 0KM426
dmi.board.vendor: Dell Inc.
dmi.board.version: A04
dmi.chassis.type: 8
dmi.chassis.vendor: Dell Inc.
dmi.chassis.version: A04
dmi.modalias: 
dmi:bvnDellInc.:bvrA04:bd03/02/2010:svnDellInc.:pnStudio1557:pvrA04:rvnDellInc.:rn0KM426:rvrA04:cvnDellInc.:ct8:cvrA04:
dmi.product.name: Studio 1557
dmi.product.version: A04
dmi.sys.vendor: Dell Inc.
version.compiz: compiz 1:0.9.7.2-0ubuntu1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.32-1ubuntu1
version.libgl1-mesa-dri: libgl1-mesa-dri 8.0.2-0ubuntu2
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 8.0.2-0ubuntu2
version.xserver-xorg-core: xserver-xorg-core 2:1.11.4-0ubuntu7
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.7.0-0ubuntu1
version.xserver-xorg-video-ati: xserver-xorg-video-ati 
1:6.14.99~git20111219.aacbd629-0ubuntu2
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.17.0-1ubuntu4
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 
1:0.0.16+git20111201+b5534a1-1build2

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


** Tags: amd64 apport-bug compiz-0.9 freeze precise ubuntu

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https://bugs.launchpad.net/bugs/965440

Title:
  Xorg freeze after connecting to external display

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