** Description changed:

+ Possible workaround:
+ -disable plymouth
+ -remove v86d
+ 
  Usually (but not always) if I log out of Ubuntu Natty Beta 2, the screen
  freezes with about a 1 inch strip of purple at the top of the screen.
  Killing x (via ctr+alt+backspace) does the same. Shutting down also has
  this problem. In all cases I am forced to kill the system.
  
  ProblemType: Bug
  DistroRelease: Ubuntu 11.04
  Package: xorg 1:7.6+4ubuntu3
  ProcVersionSignature: Ubuntu 2.6.38-8.42-generic 2.6.38.2
  Uname: Linux 2.6.38-8-generic x86_64
  NonfreeKernelModules: nvidia
  .proc.driver.nvidia.gpus.0: Error: [Errno 21] Is a directory: 
'/proc/driver/nvidia/gpus/0'
  .proc.driver.nvidia.registry: Binary: ""
  .proc.driver.nvidia.version:
-  NVRM version: NVIDIA UNIX x86_64 Kernel Module  270.41.03  Sat Apr  9 
00:06:19 PDT 2011
-  GCC version:  gcc version 4.5.2 (Ubuntu/Linaro 4.5.2-8ubuntu3)
+  NVRM version: NVIDIA UNIX x86_64 Kernel Module  270.41.03  Sat Apr  9 
00:06:19 PDT 2011
+  GCC version:  gcc version 4.5.2 (Ubuntu/Linaro 4.5.2-8ubuntu3)
  Architecture: amd64
  CompizPlugins: 
[core,bailer,detection,composite,opengl,decor,move,gnomecompat,vpswitch,grid,resize,mousepoll,compiztoolbox,imgpng,regex,wall,place,wobbly,animation,expo,session,workarounds,ezoom,staticswitcher,fade,scale,unityshell]
  CompositorRunning: compiz
  Date: Wed Apr 20 20:14:46 2011
  DistUpgraded: Fresh install
  DistroCodename: natty
  DistroVariant: ubuntu
  DkmsStatus:
-  virtualbox-ose, 4.0.4, 2.6.38-8-generic, x86_64: installed 
-  nvidia-current, 270.41.03, 2.6.38-8-generic, x86_64: installed
+  virtualbox-ose, 4.0.4, 2.6.38-8-generic, x86_64: installed
+  nvidia-current, 270.41.03, 2.6.38-8-generic, x86_64: installed
  GraphicsCard:
-  nVidia Corporation GT215 [GeForce GTS 360M] [10de:0cb1] (rev a2) (prog-if 00 
[VGA controller])
-    Subsystem: Toshiba America Info Systems Device [1179:ff50]
+  nVidia Corporation GT215 [GeForce GTS 360M] [10de:0cb1] (rev a2) (prog-if 00 
[VGA controller])
+    Subsystem: Toshiba America Info Systems Device [1179:ff50]
  InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Beta amd64 (20110413)
  JockeyStatus: xorg:nvidia_current - NVIDIA accelerated graphics driver 
(Proprietary, Enabled, In use)
  MachineType: TOSHIBA Qosmio X505
  ProcEnviron:
-  LANGUAGE=en_US:en
-  LANG=en_US.UTF-8
-  SHELL=/bin/bash
+  LANGUAGE=en_US:en
+  LANG=en_US.UTF-8
+  SHELL=/bin/bash
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.38-8-generic 
root=UUID=d0f6b463-4ea2-4a26-bda6-65edde0f134e ro quiet splash vt.handoff=7
  Renderer: Unknown
  SourcePackage: xorg
  Symptom: display
  UpgradeStatus: No upgrade log present (probably fresh install)
  XorgConf:
-  Section "Device"
-       Identifier      "Default Device"
-       Option  "NoLogo"        "True"
-  EndSection
+  Section "Device"
+   Identifier  "Default Device"
+   Option      "NoLogo"        "True"
+  EndSection
  dmi.bios.date: 06/11/2010
  dmi.bios.vendor: TOSHIBA
  dmi.bios.version: V2.60
  dmi.board.name: Qosmio X505
  dmi.board.vendor: TOSHIBA
  dmi.board.version: Not Applicable
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: TOSHIBA
  dmi.chassis.version: N/A
  dmi.modalias: 
dmi:bvnTOSHIBA:bvrV2.60:bd06/11/2010:svnTOSHIBA:pnQosmioX505:pvrPQX33U-03J01R:rvnTOSHIBA:rnQosmioX505:rvrNotApplicable:cvnTOSHIBA:ct10:cvrN/A:
  dmi.product.name: Qosmio X505
  dmi.product.version: PQX33U-03J01R
  dmi.sys.vendor: TOSHIBA
  version.compiz: compiz 1:0.9.4+bzr20110411-0ubuntu1
  version.ia32-libs: ia32-libs 20090808ubuntu12
  version.libdrm2: libdrm2 2.4.23-1ubuntu6
  version.libgl1-mesa-dri: libgl1-mesa-dri 7.10.2-0ubuntu1
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 7.10.2-0ubuntu1
  version.nvidia-graphics-drivers: nvidia-graphics-drivers N/A
  version.xserver-xorg: xserver-xorg 1:7.6+4ubuntu3
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:6.14.0-0ubuntu4
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.14.0-4ubuntu7
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 
1:0.0.16+git20110107+b795ca6e-0ubuntu7

** Also affects: plymouth
   Importance: Undecided
       Status: New

** Description changed:

  Possible workaround:
  -disable plymouth
  -remove v86d
  
- Usually (but not always) if I log out of Ubuntu Natty Beta 2, the screen
+ Usually (but not always) if I log out of Ubuntu Natty, the screen
  freezes with about a 1 inch strip of purple at the top of the screen.
  Killing x (via ctr+alt+backspace) does the same. Shutting down also has
  this problem. In all cases I am forced to kill the system.
  
  ProblemType: Bug
  DistroRelease: Ubuntu 11.04
  Package: xorg 1:7.6+4ubuntu3
  ProcVersionSignature: Ubuntu 2.6.38-8.42-generic 2.6.38.2
  Uname: Linux 2.6.38-8-generic x86_64
  NonfreeKernelModules: nvidia
  .proc.driver.nvidia.gpus.0: Error: [Errno 21] Is a directory: 
'/proc/driver/nvidia/gpus/0'
  .proc.driver.nvidia.registry: Binary: ""
  .proc.driver.nvidia.version:
   NVRM version: NVIDIA UNIX x86_64 Kernel Module  270.41.03  Sat Apr  9 
00:06:19 PDT 2011
   GCC version:  gcc version 4.5.2 (Ubuntu/Linaro 4.5.2-8ubuntu3)
  Architecture: amd64
  CompizPlugins: 
[core,bailer,detection,composite,opengl,decor,move,gnomecompat,vpswitch,grid,resize,mousepoll,compiztoolbox,imgpng,regex,wall,place,wobbly,animation,expo,session,workarounds,ezoom,staticswitcher,fade,scale,unityshell]
  CompositorRunning: compiz
  Date: Wed Apr 20 20:14:46 2011
  DistUpgraded: Fresh install
  DistroCodename: natty
  DistroVariant: ubuntu
  DkmsStatus:
   virtualbox-ose, 4.0.4, 2.6.38-8-generic, x86_64: installed
   nvidia-current, 270.41.03, 2.6.38-8-generic, x86_64: installed
  GraphicsCard:
   nVidia Corporation GT215 [GeForce GTS 360M] [10de:0cb1] (rev a2) (prog-if 00 
[VGA controller])
     Subsystem: Toshiba America Info Systems Device [1179:ff50]
  InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Beta amd64 (20110413)
  JockeyStatus: xorg:nvidia_current - NVIDIA accelerated graphics driver 
(Proprietary, Enabled, In use)
  MachineType: TOSHIBA Qosmio X505
  ProcEnviron:
   LANGUAGE=en_US:en
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.38-8-generic 
root=UUID=d0f6b463-4ea2-4a26-bda6-65edde0f134e ro quiet splash vt.handoff=7
  Renderer: Unknown
  SourcePackage: xorg
  Symptom: display
  UpgradeStatus: No upgrade log present (probably fresh install)
  XorgConf:
   Section "Device"
    Identifier  "Default Device"
    Option      "NoLogo"        "True"
   EndSection
  dmi.bios.date: 06/11/2010
  dmi.bios.vendor: TOSHIBA
  dmi.bios.version: V2.60
  dmi.board.name: Qosmio X505
  dmi.board.vendor: TOSHIBA
  dmi.board.version: Not Applicable
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: TOSHIBA
  dmi.chassis.version: N/A
  dmi.modalias: 
dmi:bvnTOSHIBA:bvrV2.60:bd06/11/2010:svnTOSHIBA:pnQosmioX505:pvrPQX33U-03J01R:rvnTOSHIBA:rnQosmioX505:rvrNotApplicable:cvnTOSHIBA:ct10:cvrN/A:
  dmi.product.name: Qosmio X505
  dmi.product.version: PQX33U-03J01R
  dmi.sys.vendor: TOSHIBA
  version.compiz: compiz 1:0.9.4+bzr20110411-0ubuntu1
  version.ia32-libs: ia32-libs 20090808ubuntu12
  version.libdrm2: libdrm2 2.4.23-1ubuntu6
  version.libgl1-mesa-dri: libgl1-mesa-dri 7.10.2-0ubuntu1
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 7.10.2-0ubuntu1
  version.nvidia-graphics-drivers: nvidia-graphics-drivers N/A
  version.xserver-xorg: xserver-xorg 1:7.6+4ubuntu3
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:6.14.0-0ubuntu4
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.14.0-4ubuntu7
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 
1:0.0.16+git20110107+b795ca6e-0ubuntu7

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https://bugs.launchpad.net/bugs/767927

Title:
  Logout Freeze [kernel tried to execute NX-protected page - exploit
  attempt? (uid: 0)]

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