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this machine is a Dell inspiron 1520 , with 2 GB of RAM , and 200 HDD .

running ubuntu 13.04 up to date, left the machine for 30 minutes and
screen lock is set to ON!, unlocked the screen then fired up totem to
watch a movie , after a couple minutes the following message showed up :

"Sorry, the program "gnome-shell" closed unexpectedly Your computer does
not have enough free memory to automatically analyse the problem and
send a report to the developers."

then,  X was terminated and drop back to the login manager .. logged
back in, and the same popup message appeared again , so my suspicion was
that it might be an abnormal  CPU usage  thought it could be Chromium!,
so i've switched to firefox opened the same webpages  as it's showing on
the following screen shot /

http://imgur.com/KCrZGRj

but the abnormal usage kept going back and forth between Xorg and Gnome
shell reached %60 - 76 CPU usage !

======================

sary@n1x:~$ lsb_release -rd; uname -a
Description:    Ubuntu Raring Ringtail (development branch)
Release:        13.04
Linux n1x 3.8.0-16-generic #26-Ubuntu SMP Mon Apr 1 19:52:57 UTC 2013 x86_64 
x86_64 x86_64 GNU/Linux
sary@n1x:~$

sary@n1x:~$ apt-cache policy xserver-xorg
xserver-xorg:
  Installed: 1:7.7+1ubuntu4
  Candidate: 1:7.7+1ubuntu4
  Version table:
 *** 1:7.7+1ubuntu4 0
        500 http://mirrors.mit.edu/ubuntu/ raring/main amd64 Packages
        100 /var/lib/dpkg/status

sary@n1x:~$ apt-cache policy xserver-xorg-core
xserver-xorg-core:
  Installed: 2:1.13.3-0ubuntu5
  Candidate: 2:1.13.3-0ubuntu5
  Version table:
 *** 2:1.13.3-0ubuntu5 0
        500 http://mirrors.mit.edu/ubuntu/ raring/main amd64 Packages
        100 /var/lib/dpkg/status


ary@n1x:~$ sudo lshw -C video
[sudo] password for sary: 
  *-display               
       description: VGA compatible controller
       product: G86M [GeForce 8400M GS]
       vendor: NVIDIA Corporation
       physical id: 0
       bus info: pci@0000:01:00.0
       version: a1
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress vga_controller bus_master cap_list rom
       configuration: driver=nvidia latency=0
       resources: irq:16 memory:fd000000-fdffffff memory:f4000000-f7ffffff 
memory:fa000000-fbffffff ioport:ef00(size=128) memory:fea00000-fea1ffff
sary@n1x:~$ 


sary@n1x:~$ dpkg -l | grep '^ii' | grep nvidia

ii  nvidia-310-updates  310.44-0ubuntu amd64 NVIDIA binary Xorg driver,
kernel module and VDPAU library

ii  nvidia-common 1:0.2.76  amd64 transitional package for ubuntu-
drivers-common

ii  nvidia-settings-310-updates 310.44-0ubuntu1 amd64 Tool for
configuring the NVIDIA graphics driver


 sary@n1x:~$ free -t
             total       used       free     shared    buffers     cached
Mem:       1017352     946348      71004          0       2292     129532
-/+ buffers/cache:     814524     202828
Swap:      2457596     613604    1843992
Total:     3474948    1559952    1914996
sary@n1x:~$

sary@n1x:~$ df /
Filesystem     1K-blocks     Used Available Use% Mounted on
/dev/sda1      112829108 11551360  95539664  11% /
sary@n1x:~$

sary@n1x:~$ echo $(cat /proc/meminfo | egrep '^(MemFree|Cached|Writeback):' | 
awk '{print $2}') - + p | dc
227540
sary@n1x:~$ grep ^VmSize /proc/$(pidof X)/status
VmSize:   246576 kB
sary@n1x:~$


=================

ProblemType: Bug
DistroRelease: Ubuntu 13.04
Package: gnome-shell 3.6.3.1-0ubuntu4
ProcVersionSignature: Ubuntu 3.8.0-16.26-generic 3.8.5
Uname: Linux 3.8.0-16-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.9.2-0ubuntu5
Architecture: amd64
Date: Wed Apr  3 04:23:22 2013
DisplayManager: gdm
GsettingsChanges: b'org.gnome.desktop.interface' b'clock-format' b"'12h'"
InstallationDate: Installed on 2013-04-01 (1 days ago)
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 
(20120425)
MarkForUpload: True
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: gnome-shell
UpgradeStatus: Upgraded to raring on 2013-04-01 (1 days ago)
---
ApportVersion: 2.9.2-0ubuntu8
Architecture: amd64
DistroRelease: Ubuntu 13.04
InstallationDate: Installed on 2013-04-01 (12 days ago)
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 
(20120425)
MarkForUpload: True
NonfreeKernelModules: nvidia
Package: nvidia-settings-310-updates 310.44-0ubuntu1
PackageArchitecture: amd64
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 3.8.0-18.28-generic 3.8.6
Tags: gnome3-ppa third-party-packages raring
Uname: Linux 3.8.0-18-generic x86_64
UpgradeStatus: Upgraded to raring on 2013-04-01 (11 days ago)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo

** Affects: nvidia-drivers-ubuntu
     Importance: Undecided
         Status: New

** Affects: xorg-server
     Importance: Undecided
         Status: New

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


** Tags: amd64 apport-bug apport-collected gnome3-ppa raring 
third-party-packages
-- 
X crashes with nvidia-310-updates
https://bugs.launchpad.net/bugs/1163651
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