Public bug reported:

I left X session, after some inactivity screenlock was displayed, it
hapened when I was disconnected from my laptop using KVM switch. When I
connected back to the laptop screen was corrupted as shown on the
attached screenshot.

It never happened in Ubuntu 12.10.

I managed to "repair" it by switching to the console and back.

ProblemType: Bug
DistroRelease: Ubuntu 13.04
Package: xorg 1:7.7+1ubuntu4
Uname: Linux 3.9.0-030900rc3-generic x86_64
ApportVersion: 2.9.2-0ubuntu5
Architecture: amd64
CompizPlugins: No value set for 
`/apps/compiz-1/general/screen0/options/active_plugins'
Date: Fri Mar 29 14:07:52 2013
DistUpgraded: 2013-03-29 13:12:46,761 DEBUG enabling apt cron job
DistroCodename: raring
DistroVariant: ubuntu
ExtraDebuggingInterest: Yes
GraphicsCard:
 Intel Corporation 3rd Gen Core processor Graphics Controller [8086:0166] (rev 
09) (prog-if 00 [VGA controller])
   Subsystem: Lenovo Device [17aa:21f3]
InstallationDate: Installed on 2012-12-28 (90 days ago)
InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.5)
MachineType: LENOVO 2347A49
MarkForUpload: True
ProcEnviron:
 TERM=linux
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.9.0-030900rc3-generic 
root=UUID=9b37b9da-4307-4c43-aea2-bcee2f5a874b ro quiet splash vt.handoff=7
SourcePackage: xorg
Symptom: display
UpgradeStatus: Upgraded to raring on 2013-03-29 (0 days ago)
dmi.bios.date: 09/12/2012
dmi.bios.vendor: LENOVO
dmi.bios.version: G1ET69WW (2.05 )
dmi.board.asset.tag: Not Available
dmi.board.name: 2347A49
dmi.board.vendor: LENOVO
dmi.board.version: No DPK
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Not Available
dmi.modalias: 
dmi:bvnLENOVO:bvrG1ET69WW(2.05):bd09/12/2012:svnLENOVO:pn2347A49:pvrThinkPadT430:rvnLENOVO:rn2347A49:rvrNoDPK:cvnLENOVO:ct10:cvrNotAvailable:
dmi.product.name: 2347A49
dmi.product.version: ThinkPad T430
dmi.sys.vendor: LENOVO
version.compiz: compiz 1:0.9.9~daily13.03.25-0ubuntu1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.43-0ubuntu1
version.libgl1-mesa-dri: libgl1-mesa-dri 9.0.3-0ubuntu1
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 9.0.3-0ubuntu1
version.xserver-xorg-core: xserver-xorg-core 2:1.13.3-0ubuntu4
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.7.3-0ubuntu2b2
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.1.0-0ubuntu2
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.21.5-0ubuntu1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.7-0ubuntu1
xserver.bootTime: Fri Mar 29 13:13:24 2013
xserver.configfile: default
xserver.errors:
 
xserver.logfile: /var/log/Xorg.0.log
xserver.version: 2:1.13.3-0ubuntu4
xserver.video_driver: intel

** Affects: xorg (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug corruption raring ubuntu

** Attachment added: "screenshot"
   
https://bugs.launchpad.net/bugs/1161869/+attachment/3606208/+files/Tp22tNh0aY8G2EtLtXd8wonr8XO4aGxNWvhypDQ76sw.jpeg

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https://bugs.launchpad.net/bugs/1161869

Title:
  Screen corruption in xorg/GDM

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