Public bug reported:

I'm assuming this is due to a lens but I'm not sure. All I know is after
using the desktop for a while I end up with this white box in the upper
left. It happens on both my precise machines, one with ATI graphics and
the other with Intel graphics so I don't think it's driver related (it
also never happened before.)

I have the HUD disabled because I originally thought it was to blame so
I know that's not it.

There's no way of making the box disappear that I know of. It's very
annoying as you can imagine.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: unity 5.6.0-0ubuntu1
ProcVersionSignature: Ubuntu 3.2.0-18.29-generic 3.2.9
Uname: Linux 3.2.0-18-generic x86_64
.tmp.unity.support.test.0:
 
ApportVersion: 1.94.1-0ubuntu2
Architecture: amd64
CompizPlugins: 
[core,bailer,detection,composite,opengl,compiztoolbox,decor,place,grid,mousepoll,gnomecompat,vpswitch,move,regex,resize,session,animation,wall,imgpng,snap,workarounds,fade,expo,scale,ezoom,unityshell]
CompositorRunning: compiz
Date: Tue Mar 13 14:49:57 2012
DistUpgraded: Fresh install
DistroCodename: precise
DistroVariant: ubuntu
GraphicsCard:
 Advanced Micro Devices [AMD] nee ATI Cedar PRO [Radeon HD 5450] [1002:68f9] 
(prog-if 00 [VGA controller])
   Subsystem: Dell XPS 8300 [1028:010e]
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
MachineType: Dell Inc. XPS 8300
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-18-generic 
root=UUID=d16fbb2d-b466-4e7e-a654-f170338c213f ro
SourcePackage: unity
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 02/15/2011
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A03
dmi.board.name: 0Y2MRG
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 3
dmi.chassis.vendor: Dell Inc.
dmi.modalias: 
dmi:bvnDellInc.:bvrA03:bd02/15/2011:svnDellInc.:pnXPS8300:pvr:rvnDellInc.:rn0Y2MRG:rvrA00:cvnDellInc.:ct3:cvr:
dmi.product.name: XPS 8300
dmi.sys.vendor: Dell Inc.
version.compiz: compiz 1:0.9.7.0+bzr3035-0ubuntu1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.30-1ubuntu1
version.libgl1-mesa-dri: libgl1-mesa-dri 8.0.1-0ubuntu2
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 8.0.1-0ubuntu2
version.xserver-xorg-core: xserver-xorg-core 2:1.11.4-0ubuntu6
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 
1:2.6.99.901+git20120126-0ubuntu2
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: unity (Ubuntu)
     Importance: Undecided
         Status: Confirmed


** Tags: amd64 apport-bug compiz-0.9 precise regression reproducible ubuntu

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https://bugs.launchpad.net/bugs/954395

Title:
  Lens leaves artifact on the screen

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