Public bug reported:

screen corruption occured over part of the screen and then lockup requiring a 
hard reboot. Lost mouse everything. only locked screen remained.
This has occurred several times since upgrade to 13.10

ProblemType: Bug
DistroRelease: Ubuntu 13.10
Package: xorg 1:7.7+1ubuntu6
ProcVersionSignature: Ubuntu 3.11.0-13.20-generic 3.11.6
Uname: Linux 3.11.0-13-generic x86_64
.tmp.unity.support.test.0:
 
ApportVersion: 2.12.5-0ubuntu2.1
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
CurrentDmesg:
 [   24.890444] ATL1E 0000:02:00.0 eth0: NIC Link is Up <100 Mbps Full Duplex>
 [   24.890453] IPv6: ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
 [  781.728937] perf samples too long (2506 > 2500), lowering 
kernel.perf_event_max_sample_rate to 50000
 [ 4110.610333] bio: create slab <bio-1> at 1
 [ 4110.819400] bio: create slab <bio-1> at 1
Date: Sun Nov 10 17:23:11 2013
DistUpgraded: 2013-10-20 14:23:16,272 DEBUG enabling apt cron job
DistroCodename: saucy
DistroVariant: ubuntu
ExtraDebuggingInterest: Yes, if not too technical
GpuHangFrequency: Once a week
GpuHangReproducibility: Seems to happen randomly
GpuHangStarted: Since a couple weeks or more
GraphicsCard:
 NVIDIA Corporation GT200 [GeForce GTX 260] [10de:05e2] (rev a1) (prog-if 00 
[VGA controller])
   Subsystem: eVga.com. Corp. Device [3842:1257]
InstallationDate: Installed on 2013-08-28 (74 days ago)
InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
LightdmGreeterLog:
 ** (unity-greeter:8331): WARNING **: Error retrieving accessibility bus 
address: org.freedesktop.DBus.Error.Disconnected: Connection was disconnected 
before a reply was received
 
 (unity-greeter:8331): Gtk-WARNING **: cannot open display: :0
MachineType: System manufacturer System Product Name
MarkForUpload: True
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.11.0-13-generic 
root=UUID=92b1aa81-e5f4-4321-9655-241c62af0e68 ro quiet splash vt.handoff=7
SourcePackage: xorg
Symptom: display
Title: Xorg freeze
UpgradeStatus: Upgraded to saucy on 2013-10-20 (21 days ago)
dmi.bios.date: 02/20/2009
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 0210
dmi.board.asset.tag: To Be Filled By O.E.M.
dmi.board.name: P5Q PRO TURBO
dmi.board.vendor: ASUSTeK Computer INC.
dmi.board.version: Rev 1.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.:bvr0210:bd02/20/2009:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKComputerINC.:rnP5QPROTURBO:rvrRev1.xx:cvnChassisManufacture:ct3:cvrChassisVersion:
dmi.product.name: System Product Name
dmi.product.version: System Version
dmi.sys.vendor: System manufacturer
version.compiz: compiz 1:0.9.10+13.10.20131011-0ubuntu1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.46-1
version.libgl1-mesa-dri: libgl1-mesa-dri 9.2.1-1ubuntu3
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 9.2.1-1ubuntu3
version.xserver-xorg-core: xserver-xorg-core 2:1.14.3-3ubuntu2
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.7.3-0ubuntu3.1
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.2.0-0ubuntu10
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.904-0ubuntu2
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.9-2ubuntu1
xserver.bootTime: Sun Nov 10 16:13:25 2013
xserver.configfile: default
xserver.errors:
 Failed to load module "nvidia" (module does not exist, 0)
 Failed to load module "nvidia" (module does not exist, 0)
xserver.logfile: /var/log/Xorg.0.log
xserver.version: 2:1.14.3-3ubuntu2
xserver.video_driver: nouveau

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


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

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which is subscribed to xorg in Ubuntu.
https://bugs.launchpad.net/bugs/1249876

Title:
  Xorg freeze

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