Screen freeze, Xorg 100% cpu, no access to tty console

[Le Gluon Du Net]

Hello,

screen suddenly freeze, I can no more access to another virtual console TTY, all I can do is connect in ssh. In a ssh console, I can see Xorg consumes 100% cpu but it's impossible to kill it with root user, even with -9 option. All I can do is to reboot my computer from ssh console. Thanks for ypur help.

ProblemType: Bug
DistroRelease: Ubuntu 13.04
Package: xserver-xorg 1:7.7+1ubuntu4
ProcVersionSignature: Ubuntu 3.8.0-9.18-generic 3.8.1
Uname: Linux 3.8.0-9-generic x86_64
NonfreeKernelModules: fglrx
ApportVersion: 2.9-0ubuntu2
Architecture: amd64
CompizPlugins: [core,composite,opengl,compiztoolbox,decor,vpswitch,snap,mousepoll,resize,place,move,wall,grid,regex,imgpng,session,gnomecompat,animation,fade,workarounds,scale,expo,ezoom]
Date: Sun Mar 3 20:16:58 2013
DistUpgraded: 2013-02-13 03:05:04,175 DEBUG failed to SystemUnLock() (E:Non verrouillé)
DistroCodename: raring
DistroVariant: ubuntu
ExtraDebuggingInterest: Yes
GraphicsCard:
 Advanced Micro Devices [AMD] nee ATI Pitcairn PRO [Radeon HD 7800] [1002:6819] (prog-if 00 [VGA controller])
   Subsystem: PC Partner Limited Device [174b:e218]
InstallationDate: Installed on 2012-07-07 (239 days ago)
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425)
JockeyStatus:
 kmod:fglrx - Video driver for the AMD graphics accelerators (Proprietary, Disabled, Not in use)
 kmod:fglrx_updates - ATI Fire GL (Proprietary, Enabled, Not in use)
MachineType: MSI MS-7752
MarkForUpload: True
PlymouthDebug: Error: [Errno 13] Permission denied: '/var/log/plymouth-debug.log'
ProcEnviron:
 TERM=screen
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=fr_FR.UTF-8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.8.0-9-generic root=UUID=0f08ee3a-4677-4c05-ab94-5d9805be3326 ro quiet splash vt.handoff=7
SourcePackage: xorg
UpgradeStatus: Upgraded to raring on 2013-02-13 (18 days ago)
dmi.bios.date: 06/19/2012
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: V2.5
dmi.board.asset.tag: To be filled by O.E.M.
dmi.board.name: Z77A-G45 (MS-7752)
dmi.board.vendor: MSI
dmi.board.version: 1.0
dmi.chassis.asset.tag: To Be Filled By O.E.M.
dmi.chassis.type: 3
dmi.chassis.vendor: MSI
dmi.chassis.version: 1.0
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrV2.5:bd06/19/2012:svnMSI:pnMS-7752:pvr1.0:rvnMSI:rnZ77A-G45(MS-7752):rvr1.0:cvnMSI:ct3:cvr1.0:
dmi.product.name: MS-7752
dmi.product.version: 1.0
dmi.sys.vendor: MSI
version.compiz: compiz 1:0.9.9~daily13.03.01-0ubuntu1
version.fglrx-installer: fglrx-installer N/A
version.ia32-libs: ia32-libs 20090808ubuntu36
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 2:1.13.2-0ubuntu2
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: Sun Mar 3 10:41:01 2013
xserver.configfile: /etc/X11/xorg.conf
xserver.errors:

xserver.logfile: /var/log/Xorg.0.log
xserver.version: 2:1.13.2-0ubuntu2
xserver.video_driver: fglrx

[Le Gluon Du Net (legluondunet)]

Bug still present in Raring 13.04, I joined you my dmesg wich contains crash information.

Thanks for your help.