maximized windows are not really maximized

[Macia Maxime]

A margin of a few pixels appear on the edges of the maximized windows.
It appears sometimes right, sometimes left.

An example screenshot of a thunderbird in full screen with a wallpaper red is attached

ProblemType: Bug
DistroRelease: Ubuntu 13.04
Package: unity 6.12.0daily13.03.07-0ubuntu1
ProcVersionSignature: Ubuntu 3.8.0-11.20-generic 3.8.2
Uname: Linux 3.8.0-11-generic x86_64
.tmp.unity.support.test.0:

ApportVersion: 2.9.1-0ubuntu1
Architecture: amd64
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
CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
CompositorUnredirectFSW: true
Date: Fri Mar 8 13:46:47 2013
DistUpgraded: 2013-01-22 15:38:28,293 DEBUG enabling apt cron job
DistroCodename: raring
DistroVariant: ubuntu
DkmsStatus: virtualbox, 4.2.8, 3.8.0-11-generic, x86_64: installed
GraphicsCard:
 Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller [8086:0116] (rev 09) (prog-if 00 [VGA controller])
   Subsystem: CLEVO/KAPOK Computer Device [1558:2700]
InstallationDate: Installed on 2012-10-01 (158 days ago)
InstallationMedia: Ubuntu 12.04 "Precise" - Build amd64 LIVE Binary 20120425-15:28
MachineType: CLEVO CO. W270HU
MarkForUpload: True
ProcEnviron:
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=fr_FR.UTF-8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.8.0-11-generic root=UUID=698db9d1-a322-4517-87ee-fd509843ea74 ro quiet splash vt.handoff=7
SourcePackage: unity
UpgradeStatus: Upgraded to raring on 2013-01-22 (44 days ago)
dmi.bios.date: 08/09/2011
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 4.6.4
dmi.board.asset.tag: Tag 12345
dmi.board.name: W270HU
dmi.board.vendor: CLEVO CO.
dmi.board.version: D02A
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: No Enclosure
dmi.chassis.version: N/A
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr4.6.4:bd08/09/2011:svnCLEVOCO.:pnW270HU:pvrNotApplicable:rvnCLEVOCO.:rnW270HU:rvrD02A:cvnNoEnclosure:ct10:cvrN/A:
dmi.product.name: W270HU
dmi.product.version: Not Applicable
dmi.sys.vendor: CLEVO CO.
version.compiz: compiz 1:0.9.9~daily13.03.06-0ubuntu1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.42-0ubuntu1
version.libgl1-mesa-dri: libgl1-mesa-dri 9.0.2-0ubuntu1
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 9.0.2-0ubuntu1
version.xserver-xorg-core: xserver-xorg-core 2:1.13.2-0ubuntu3
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.7.3-0ubuntu2
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.1.0-0ubuntu1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.21.3-0ubuntu1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.6-0ubuntu3
xserver.bootTime: Fri Mar 8 11:07:18 2013
xserver.configfile: default
xserver.errors:

xserver.logfile: /var/log/Xorg.0.log
xserver.version: 2:1.13.2-0ubuntu3
xserver.video_driver: intel

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Pierre-Olivier Megret (sorrodje)]

The bug affects me too . Only on right edge on full screen mode.

Thanks!

[Xavier Guillot (valeryan-24)]

I confirm it with Firefox, on the right side, too: clicking on the right of the mouse bar to move up and down makes application in background appear.

[Adolfo Jayme Barrientos (fitojb)]

Yeah, I've just noticed this too, seems like a recent regression in Compiz?

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Sami Jaktholm (sjakthol)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. This particular bug has already been reported and is a duplicate of bug 1140505, so it is being marked as such. Please look at the other bug report to see if there is any missing information that you can provide, or to see if there is a workaround for the bug. Additionally, any further discussion regarding the bug should occur in the other report. Feel free to continue to report any other bugs you may find.