X crashes with gnome-session: Fatal IO error 11

Duplicate of bug:
https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/999191

Operations that reproduce this are:

Trying to open a chat (messaging) window in Skype 4.0.0.8-0oneiric1 ( installed from software center)
Trying to navigate save directories in K3b 2.0.2-3ubuntu4
opening virtualbox 4.1.12-dfsg-2ubuntu0.2

My computer:
Ubuntu 12.04 x86_64
xorg 1:7.6+12ubuntu1
nvidia-current-updates 304.43-0ubuntu0.1

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: xorg 1:7.6+12ubuntu1
ProcVersionSignature: Ubuntu 3.2.0-32.51-generic 3.2.30
Uname: Linux 3.2.0-32-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 304.43 Sun Aug 19 20:14:03 PDT 2012
 GCC version: gcc version 4.6.3 (Ubuntu/Linaro 4.6.3-1ubuntu5)
.proc.driver.nvidia.warnings.fbdev:
 Your system is not currently configured to drive a VGA console
 on the primary VGA device. The NVIDIA Linux graphics driver
 requires the use of a text-mode VGA console. Use of other console
 drivers including, but not limited to, vesafb, may result in
 corruption and stability problems, and is not supported.
.tmp.unity.support.test.0:

ApportVersion: 2.0.1-0ubuntu14
Architecture: amd64
CompizPlugins: [core,composite,opengl,compiztoolbox,decor,imgpng,place,grid,resize,move,regex,snap,mousepoll,gnomecompat,vpswitch,animation,workarounds,session,wall,expo,ezoom,staticswitcher,fade,scale]
CompositorRunning: compiz
Date: Tue Nov 13 23:40:34 2012
DistUpgraded: Fresh install
DistroCodename: precise
DistroVariant: ubuntu
EcryptfsInUse: Yes
ExtraDebuggingInterest: Yes,
GraphicsCard:
 NVIDIA Corporation G92 [GeForce 9800 GT] [10de:0614] (rev a2) (prog-if 00 [VGA controller])
   Subsystem: Giga-byte Technology Device [1458:34d3]
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425)
JockeyStatus:
 xorg:nvidia_current - NVIDIA accelerated graphics driver (Proprietary, Disabled, Not in use)
 xorg:nvidia_current_updates - NVIDIA accelerated graphics driver (post-release updates) (Proprietary, Enabled, In use)
 xorg:nvidia_experimental_304 - NVIDIA accelerated graphics driver (**experimental** beta) (Proprietary, Disabled, Not in use)
 xorg:nvidia_experimental_310 - NVIDIA accelerated graphics driver (**experimental** beta) (Proprietary, Disabled, Not in use)
MachineType: BIOSTAR Group A780L3L
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-32-generic root=UUID=52559963-7b28-466c-9c3e-e9d9875cce8d ro quiet splash vt.handoff=7
SourcePackage: xorg
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 06/07/2010
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 080014
dmi.board.asset.tag: To Be Filled By O.E.M.
dmi.board.name: A780L3L
dmi.board.vendor: BIOSTAR Group
dmi.chassis.asset.tag: None
dmi.chassis.type: 3
dmi.chassis.vendor: BIOSTAR Group
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr080014:bd06/07/2010:svnBIOSTARGroup:pnA780L3L:pvr:rvnBIOSTARGroup:rnA780L3L:rvr:cvnBIOSTARGroup:ct3:cvr:
dmi.product.name: A780L3L
dmi.sys.vendor: BIOSTAR Group
version.compiz: compiz 1:0.9.7.8-0ubuntu1.4ppa1~precise1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.32-1ubuntu1
version.libgl1-mesa-dri: libgl1-mesa-dri 8.0.4-0ubuntu0.2
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 8.0.4-0ubuntu0.2
version.nvidia-graphics-drivers: nvidia-graphics-drivers N/A
version.xserver-xorg-core: xserver-xorg-core 2:1.11.4-0ubuntu10.8
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.7.0-0ubuntu1.2
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:6.14.99~git20111219.aacbd629-0ubuntu2
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.17.0-1ubuntu4.2
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:0.0.16+git20111201+b5534a1-1build2