Dash background flickers

[Alex Elzenaar]

When moving the mouse around the dash, the background changes colour and opacity in the top-left quadrant of the screen.

In the bottom-left corner, there is an area that is not smoothed with the rest of the dash. There is a pronounced line between this and the rest (see screenshot).

ProblemType: Bug
DistroRelease: Ubuntu 13.04
Package: unity 6.12.0daily13.01.17-0ubuntu1
ProcVersionSignature: Ubuntu 3.5.0-16.25-generic 3.5.4
Uname: Linux 3.5.0-16-generic i686
.tmp.unity.support.test.0:

ApportVersion: 2.8-0ubuntu2
Architecture: i386
CompizPlugins: [core,composite,opengl,compiztoolbox,decor,vpswitch,snap,mousepoll,resize,place,move,wall,grid,regex,imgpng,session,gnomecompat,animation,fade,unitymtgrabhandles,workarounds,scale,expo,ezoom,unityshell]
CompositorRunning: compiz
Date: Sun Jan 20 13:23:14 2013
DistUpgraded: 2013-01-18 17:19:45,154 DEBUG enabling apt cron job
DistroCodename: raring
DistroVariant: ubuntu
GraphicsCard:
 Intel Corporation Atom Processor D4xx/D5xx/N4xx/N5xx Integrated Graphics Controller [8086:a011] (prog-if 00 [VGA controller])
   Subsystem: Samsung Electronics Co Ltd Device [144d:c08f]
   Subsystem: Samsung Electronics Co Ltd Device [144d:c08f]
InstallationDate: Installed on 2012-02-02 (352 days ago)
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release i386 (20111012)
MachineType: SAMSUNG ELECTRONICS CO., LTD. N250P/N145P
MarkForUpload: True
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.5.0-16-generic root=UUID=02a59a4e-e52e-4c2f-bcb0-a31c55f74093 ro quiet splash vt.handoff=7
SourcePackage: unity
UpgradeStatus: Upgraded to raring on 2013-01-18 (1 days ago)
dmi.bios.date: 07/18/2011
dmi.bios.vendor: Phoenix Technologies Ltd.
dmi.bios.version: 02HG.M014.20110718.JIP
dmi.board.asset.tag: SAMSUNG
dmi.board.name: N250P/N145P
dmi.board.vendor: SAMSUNG ELECTRONICS CO., LTD.
dmi.board.version: Not Applicable
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: SAMSUNG ELECTRONICS CO., LTD.
dmi.chassis.version: N/A
dmi.modalias: dmi:bvnPhoenixTechnologiesLtd.:bvr02HG.M014.20110718.JIP:bd07/18/2011:svnSAMSUNGELECTRONICSCO.,LTD.:pnN250P/N145P:pvrNotApplicable:rvnSAMSUNGELECTRONICSCO.,LTD.:rnN250P/N145P:rvrNotApplicable:cvnSAMSUNGELECTRONICSCO.,LTD.:ct10:cvrN/A:
dmi.product.name: N250P/N145P
dmi.product.version: Not Applicable
dmi.sys.vendor: SAMSUNG ELECTRONICS CO., LTD.
version.compiz: compiz 1:0.9.9~daily13.01.17-0ubuntu1
version.libdrm2: libdrm2 2.4.41-0ubuntu1
version.libgl1-mesa-dri: libgl1-mesa-dri 9.0.1-0ubuntu1
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 9.0.1-0ubuntu1
version.xserver-xorg-core: xserver-xorg-core 2:1.13.1.901-0ubuntu1
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.7.3-0ubuntu2
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.0.0-0ubuntu1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.20.18-0ubuntu1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.6-0ubuntu1
xserver.bootTime: Sun Jan 20 12:39:38 2013
xserver.configfile: default
xserver.errors:

xserver.logfile: /var/log/Xorg.0.log
xserver.version: 2:1.13.1.901-0ubuntu1
xserver.video_driver: intel