Public bug reported:

xorg freezes or malfunctions with desktop environments that use 3D with
3d and desktop effects on ubuntu 12.04. In alpha through beta 2, I
didn't have this problem. Anyway in Unity 3D, Cinnamon, and gnome
classic session (excluding "No Effects) I experience this problem. This
problem does not occur in MATE, Unity 2D and GNOME Classic (No Effects).

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: xorg 1:7.6+12ubuntu1
ProcVersionSignature: Ubuntu 3.2.0-25.40-generic-pae 3.2.18
Uname: Linux 3.2.0-25-generic-pae i686
NonfreeKernelModules: nvidia
.proc.driver.nvidia.gpus.0: Error: [Errno 21] Is a directory: 
'/proc/driver/nvidia/gpus/0'
.proc.driver.nvidia.registry: Binary: ""
.proc.driver.nvidia.version:
 NVRM version: NVIDIA UNIX x86 Kernel Module  295.40  Thu Apr  5 21:28:09 PDT 
2012
 GCC version:  gcc version 4.6.3 (Ubuntu/Linaro 4.6.3-1ubuntu5)
ApportVersion: 2.0.1-0ubuntu9
Architecture: i386
CompizPlugins: 
[core,composite,place,vpswitch,gnomecompat,move,session,imgpng,regex,compiztoolbox,mousepoll,resize]
Date: Tue Jun 12 02:04:01 2012
DistUpgraded: Fresh install
DistroCodename: precise
DistroVariant: ubuntu
DkmsStatus:
 nvidia-current, 295.40, 3.2.0-24-generic-pae, i686: installed
 nvidia-current, 295.40, 3.2.0-25-generic-pae, i686: installed
 nvidia-current-updates, 295.49, 3.2.0-25-generic-pae, i686: installed
ExtraDebuggingInterest: Yes, if not too technical
GpuHangFrequency: Several times a week
GpuHangReproducibility: Seems to happen randomly
GpuHangStarted: Immediately after installing this version of Ubuntu
GraphicsCard:
 NVIDIA Corporation C73 [GeForce 7100 / nForce 620i] [10de:07e5] (rev a2) 
(prog-if 00 [VGA controller])
   Subsystem: Acer Incorporated [ALI] Device [1025:0137]
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release i386 (20120423)
JockeyStatus:
 xorg:nvidia_current - NVIDIA accelerated graphics driver (Proprietary, 
Enabled, In use)
 xorg:nvidia_current_updates - NVIDIA accelerated graphics driver (post-release 
updates) (Proprietary, Disabled, Not in use)
Lsusb:
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
 Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
 Bus 001 Device 003: ID 154b:0057 PNY 
 Bus 002 Device 002: ID 058f:9360 Alcor Micro Corp. 8-in-1 Media Card Reader
 Bus 002 Device 003: ID 0461:4d22 Primax Electronics, Ltd
MachineType: ACER Aspire M1640
ProcEnviron:
 TERM=linux
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-25-generic-pae 
root=UUID=3d4e4167-125e-4538-9b23-a2193f7480ef ro quiet splash vt.handoff=7
SourcePackage: xorg
Symptom: display
Title: Xorg freeze
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 02/26/2009
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: R01-C2
dmi.board.asset.tag: To Be Filled By O.E.M.
dmi.board.name: MCP73VE
dmi.board.vendor: ACER
dmi.board.version: NVIDIA MCP73
dmi.chassis.asset.tag: To Be Filled By O.E.M.
dmi.chassis.type: 3
dmi.chassis.vendor: To Be Filled By O.E.M.
dmi.chassis.version: To Be Filled By O.E.M.
dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvrR01-C2:bd02/26/2009:svnACER:pnAspireM1640:pvrR01-C2:rvnACER:rnMCP73VE:rvrNVIDIAMCP73:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
dmi.product.name: Aspire M1640
dmi.product.version: R01-C2
dmi.sys.vendor: ACER
version.compiz: compiz 1:0.9.7.8-0ubuntu1
version.libdrm2: libdrm2 2.4.32-1ubuntu1
version.libgl1-mesa-dri: libgl1-mesa-dri 8.0.2-0ubuntu3.1
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 8.0.2-0ubuntu3.1
version.nvidia-graphics-drivers: nvidia-graphics-drivers N/A
version.xserver-xorg-core: xserver-xorg-core 2:1.11.4-0ubuntu10.2
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.7.0-0ubuntu1.1
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: apport-bug freeze i386 precise ubuntu

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https://bugs.launchpad.net/bugs/1012453

Title:
  -xorg freezes or malfunctions with desktop environments that use 3D
  with 3d and desktop effects on ubuntu 12.04

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