Public bug reported:

Since I restarted my laptop a couple of hours ago, i get this strange
corruption. It looks like the background is shifted, and X has problem
repainting the screen where there is no background. Also, the unity dock
does not hide. As you can see, the firefox window is missing its
decorations as well, though other windows still have proper decorations.

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: xorg 1:7.6+7ubuntu7
ProcVersionSignature: Ubuntu 3.0.0-12.19-generic-pae 3.0.4
Uname: Linux 3.0.0-12-generic-pae i686
.tmp.unity.support.test.0:
 
ApportVersion: 1.23-0ubuntu2
Architecture: i386
CompizPlugins: 
[core,bailer,detection,composite,opengl,decor,place,compiztoolbox,move,resize,vpswitch,snap,mousepoll,imgpng,grid,regex,gnomecompat,animation,wall,session,workarounds,expo,ezoom,staticswitcher,fade,scale,unityshell]
CompositorRunning: compiz
Date: Thu Sep 29 19:05:53 2011
DistUpgraded: Fresh install
DistroCodename: oneiric
DistroVariant: ubuntu
DkmsStatus:
 bcmwl, 5.100.82.38+bdcom, 3.0.0-11-generic, i686: installed
 bcmwl, 5.100.82.38+bdcom, 3.0.0-11-generic-pae, i686: installed
 bcmwl, 5.100.82.38+bdcom, 3.0.0-12-generic, i686: installed
ExtraDebuggingInterest: Yes, whatever it takes to get this fixed in Ubuntu
GraphicsCard:
 Intel Corporation Core Processor Integrated Graphics Controller [8086:0046] 
(rev 12) (prog-if 00 [VGA controller])
   Subsystem: Acer Incorporated [ALI] Device [1025:0364]
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Beta i386 (20110921.2)
Lsusb:
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
 Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
 Bus 001 Device 002: ID 8087:0020 Intel Corp. Integrated Rate Matching Hub
 Bus 002 Device 002: ID 8087:0020 Intel Corp. Integrated Rate Matching Hub
 Bus 002 Device 004: ID 04f2:b1d8 Chicony Electronics Co., Ltd
MachineType: Acer Aspire 3820
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.0.0-12-generic-pae 
root=UUID=5d054d31-2735-4dfd-bd5e-091b63eb8464 ro quiet splash 
acpi_backlight=vendor vt.handoff=7
SourcePackage: xorg
Symptom: display
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 05/04/2010
dmi.bios.vendor: Phoenix Technologies LTD
dmi.bios.version: V1.13
dmi.board.asset.tag: No Asset Tag
dmi.board.name: Aspire 3820
dmi.board.vendor: Acer
dmi.board.version: V1.13
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: Acer
dmi.chassis.version: V1.13
dmi.modalias: 
dmi:bvnPhoenixTechnologiesLTD:bvrV1.13:bd05/04/2010:svnAcer:pnAspire3820:pvrV1.13:rvnAcer:rnAspire3820:rvrV1.13:cvnAcer:ct10:cvrV1.13:
dmi.product.name: Aspire 3820
dmi.product.version: V1.13
dmi.sys.vendor: Acer
version.compiz: compiz 1:0.9.6+bzr20110929-0ubuntu1
version.libdrm2: libdrm2 2.4.26-1ubuntu1
version.libgl1-mesa-dri: libgl1-mesa-dri 7.11-0ubuntu3
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 7.11-0ubuntu3
version.xserver-xorg: xserver-xorg 1:7.6+7ubuntu7
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.6.0-1ubuntu13
version.xserver-xorg-video-ati: xserver-xorg-video-ati 
1:6.14.99~git20110811.g93fc084-0ubuntu1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.15.901-1ubuntu2
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 
1:0.0.16+git20110411+8378443-1

** Affects: ubuntu
     Importance: Undecided
         Status: New


** Tags: apport-bug compiz-0.9 corruption i386 oneiric running-unity ubuntu

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https://bugs.launchpad.net/bugs/862864

Title:
  Background shifted and problem repainting part of the screen

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