Public bug reported:

Symptons: 
Display freezes, but not mouse, after 30 seconds aprox display refreshes, and 
only background image is shown over 3 seconds aprox and then apport window 
appears to send report, other times apport window doesn't appear and everything 
just continues as normal.

Steps to reproduce:
1. I think the goal in this is saturate GPU, so what I do is to open many 
images with GIMP say 20, open Firefox, Chrome, VLC player with a video running 
and Audacity. With those are sufficient to reproduce the issue which becomes 
recurrent to say every 2 minutes.

To make it clear, not only xorg package gets involved in these freezes
other many times it's compiz.

I'd like you to give me guidelines to seriously troubleshoot this issue.

Thanks

ProblemType: Bug
DistroRelease: Ubuntu 15.10
Package: xorg 1:7.7+7ubuntu4
ProcVersionSignature: Ubuntu 4.2.0-16.19-generic 4.2.3
Uname: Linux 4.2.0-16-generic x86_64
NonfreeKernelModules: nvidia
.proc.driver.nvidia.gpus.0: Error: [Errno 21] Es un directorio: 
'/proc/driver/nvidia/gpus/0'
.proc.driver.nvidia.registry: Binary: ""
.proc.driver.nvidia.version:
 NVRM version: NVIDIA UNIX x86_64 Kernel Module  304.131  Sun Nov  8 21:43:33 
PST 2015
 GCC version:  gcc version 5.2.1 20151010 (Ubuntu 5.2.1-22ubuntu2)
.tmp.unity.support.test.0:
 
ApportVersion: 2.19.1-0ubuntu5
Architecture: amd64
CompizPlugins: No value set for 
`/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: compiz
CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
CompositorUnredirectFSW: true
CurrentDesktop: Unity
Date: Mon Dec 14 18:55:06 2015
DistUpgraded: Fresh install
DistroCodename: wily
DistroVariant: ubuntu
DkmsStatus: nvidia-304, 304.131, 4.2.0-16-generic, x86_64: installed
ExtraDebuggingInterest: Yes, including running git bisection searches
GpuHangFrequency: Several times a day
GpuHangReproducibility: Yes, I can easily reproduce it
GpuHangStarted: Since before I upgraded
GraphicsCard:
 NVIDIA Corporation C68 [GeForce 7050 PV / nForce 630a] [10de:053b] (rev a2) 
(prog-if 00 [VGA controller])
   Subsystem: ASUSTeK Computer Inc. Device [1043:82b3]
InstallationDate: Installed on 2015-10-25 (50 days ago)
InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
MachineType: System manufacturer System Product Name
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.2.0-16-generic 
root=UUID=00690a4c-1365-4414-a6c6-0d9f5368a520 ro quiet splash
SourcePackage: xorg
Symptom: display
Title: Xorg freeze
UdevLog: Error: [Errno 2] No existe el archivo o el directorio: '/var/log/udev'
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 12/05/2008
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 0709
dmi.board.asset.tag: To Be Filled By O.E.M.
dmi.board.name: M2N-VM HDMI
dmi.board.vendor: ASUSTeK Computer INC.
dmi.board.version: Rev x.xx
dmi.chassis.asset.tag: Asset-1234567890
dmi.chassis.type: 3
dmi.chassis.vendor: Chassis Manufacture
dmi.chassis.version: Chassis Version
dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvr0709:bd12/05/2008:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKComputerINC.:rnM2N-VMHDMI:rvrRevx.xx:cvnChassisManufacture:ct3:cvrChassisVersion:
dmi.product.name: System Product Name
dmi.product.version: System Version
dmi.sys.vendor: System manufacturer
version.compiz: compiz 1:0.9.12.2+15.10.20151015-0ubuntu1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.64-1
version.libgl1-mesa-dri: libgl1-mesa-dri 11.0.2-1ubuntu4
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 11.0.2-1ubuntu4
version.nvidia-graphics-drivers: nvidia-graphics-drivers-* N/A
version.xserver-xorg-core: xserver-xorg-core 2:1.17.2-1ubuntu9.1
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.9.2-1ubuntu1
version.xserver-xorg-video-ati: xserver-xorg-video-ati 
1:7.5.0+git20150819-0ubuntu1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 
2:2.99.917+git20150808-0ubuntu4
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.11-1ubuntu3
xserver.bootTime: Mon Dec 14 17:19:15 2015
xserver.configfile: default
xserver.devices:
 input        Power Button         KEYBOARD, id 6
 input        Power Button         KEYBOARD, id 7
 input        AT Translated Set 2 keyboard KEYBOARD, id 8
 input        ImPS/2 Generic Wheel Mouse MOUSE, id 9
xserver.errors: open /dev/fb0: No such file or directory
xserver.logfile: /var/log/Xorg.0.log
xserver.outputs:
 
xserver.version: 2:1.17.2-1ubuntu9.1

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


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

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https://bugs.launchpad.net/bugs/1526110

Title:
  Xorg freeze

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