Xorg crashed with SIGABRT in raise()

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ubuntu 13.04 raring bug: state: (critical)

when ubuntu starts to change the wallpaper any GUI hangs completely while the interface is blocked and I have to restart my computer! it makes it hard some days!

ProblemType: Crash
DistroRelease: Ubuntu 13.04
Package: xserver-xorg-core 2:1.13.2-0ubuntu1
ProcVersionSignature: Ubuntu 3.8.0-4.8-generic 3.8.0-rc6
Uname: Linux 3.8.0-4-generic i686
.tmp.unity.support.test.0:

ApportVersion: 2.8-0ubuntu4
Architecture: i386
CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: compiz
CrashCounter: 1
Date: Mon Feb 4 21:19:58 2013
DistUpgraded: Fresh install
DistroCodename: raring
DistroVariant: ubuntu
ExecutablePath: /usr/bin/Xorg
ExtraDebuggingInterest: I just need to know a workaround
GraphicsCard:
 Advanced Micro Devices [AMD] nee ATI RV635 [Mobility Radeon HD 3650] [1002:9591] (prog-if 00 [VGA controller])
   Subsystem: Toshiba America Info Systems Device [1179:ff50]
InstallationDate: Installed on 2013-01-09 (26 days ago)
InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Alpha i386 (20130107)
MachineType: TOSHIBA Satellite P300
MarkForUpload: True
ProcCmdline: /usr/bin/X :0 -core -auth /var/run/lightdm/root/:0 -nolisten tcp vt7 -novtswitch
ProcEnviron:

ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.8.0-4-generic root=UUID=f98a4c93-4890-426a-a6cf-a261aba071b9 ro quiet splash vt.handoff=7
Signal: 6
SourcePackage: xorg-server
StacktraceTop:
 raise () from /lib/i386-linux-gnu/libc.so.6
 abort () from /lib/i386-linux-gnu/libc.so.6
 OsAbort ()
 ?? ()
 FatalError ()
Title: Xorg crashed with SIGABRT in raise()
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups:

dmi.bios.date: 04/14/2008
dmi.bios.vendor: TOSHIBA
dmi.bios.version: V2.70
dmi.board.name: Satellite P300
dmi.board.vendor: TOSHIBA
dmi.board.version: Not Applicable
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 1
dmi.chassis.vendor: TOSHIBA
dmi.chassis.version: N/A
dmi.modalias: dmi:bvnTOSHIBA:bvrV2.70:bd04/14/2008:svnTOSHIBA:pnSatelliteP300:pvrPSPC4E-03L015FR:rvnTOSHIBA:rnSatelliteP300:rvrNotApplicable:cvnTOSHIBA:ct1:cvrN/A:
dmi.product.name: Satellite P300
dmi.product.version: PSPC4E-03L015FR
dmi.sys.vendor: TOSHIBA
version.compiz: compiz 1:0.9.9~daily13.02.04-0ubuntu1
version.libdrm2: libdrm2 2.4.41-0ubuntu1
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 2:1.13.2-0ubuntu1
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.7.3-0ubuntu2
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.1.0-0ubuntu1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.20.19-0ubuntu3
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.6-0ubuntu2
xserver.bootTime: Mon Feb 4 21:21:42 2013
xserver.configfile: default
xserver.errors:

xserver.logfile: /var/log/Xorg.0.log
xserver.version: 2:1.13.2-0ubuntu1
xserver.video_driver: radeon

[Apport retracing service (apport)]

Thank you for taking the time to report this crash and helping to make this software better. This particular crash has already been reported and is a duplicate of bug #1037518, so 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. Please continue to report any other bugs you may find.