Public bug reported:

 have a clean 14.04 Ubuntu installation on a dell precision T5400 with a
NVIDIA card. The system is updated and upgraded. When the system locks
after 5 minutes and turns off the monitors, the system does not show the
login screen. I can still see the apps I left open before the lock. I
can actually move the mouse pointer to the left and see the hide/unhide
animation for the tool bar.  "syslog" contents that are probably related
to this problem

suspend May  5 11:24:34 slozano-01 kernel: [233478.298064] usb 1-5.3: USB 
disconnect, device number 9
May  5 11:24:34 slozano-01 colord: device removed: sysfs-(null)
May  5 11:24:34 slozano-01 colord: device removed: sysfs-samsung-Galaxy_Nexus
May  5 11:29:33 slozano-01 kernel: [233776.995035] nouveau E[compiz[4535]] fail 
ttm_validate
May  5 11:29:33 slozano-01 kernel: [233776.995043] nouveau E[compiz[4535]] 
validate vram_list
May  5 11:29:33 slozano-01 kernel: [233776.995100] nouveau E[compiz[4535]] 
validate: -12
May  5 11:29:33 slozano-01 kernel: [233777.254919] nouveau E[compiz[4535]] fail 
ttm_validate
May  5 11:29:33 slozano-01 kernel: [233777.254927] nouveau E[compiz[4535]] 
validate vram_list
May  5 11:29:33 slozano-01 kernel: [233777.254982] nouveau E[compiz[4535]] 
validate: -12
May  5 11:43:18 slozano-01 colord: device removed: xrandr-Dell Inc.-DELL 
2009W-KM50984O435L
May  5 11:43:18 slozano-01 colord: device removed: xrandr-Dell Inc.-DELL 
2009W-KM50984O448L
May  5 11:43:18 slozano-01 colord: Profile removed: 
icc-dc7cf53b156187281507a2bdfcabad3c
May  5 11:43:18 slozano-01 colord: Profile removed: 
icc-d09afdda29e099d929b13d54c0f5e976
May 5 11:43:18 slozano-01 gnome-session[4340]: Gdk-WARNING: gnome-session: 
Fatal IO error 11 (Resource temporarily unavailable) on X server :0.#012

This maybe is related to bug: "https://bugs.launchpad.net/ubuntu/+source
/nvidia-graphics-drivers/+bug/999191"

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: xorg 1:7.7+1ubuntu8
ProcVersionSignature: Ubuntu 3.13.0-24.46-generic 3.13.9
Uname: Linux 3.13.0-24-generic x86_64
.tmp.unity.support.test.0:
 
ApportVersion: 2.14.1-0ubuntu3
Architecture: amd64
CompizPlugins: No value set for 
`/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: compiz
CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
CompositorUnredirectFSW: true
CurrentDesktop: Unity
Date: Mon May  5 12:35:24 2014
DistUpgraded: Fresh install
DistroCodename: trusty
DistroVariant: ubuntu
DkmsStatus: virtualbox, 4.3.10, 3.13.0-24-generic, x86_64: installed
ExtraDebuggingInterest: Yes, if not too technical
GraphicsCard:
 NVIDIA Corporation G71GL [Quadro FX 3500] [10de:029d] (rev a1) (prog-if 00 
[VGA controller])
   Subsystem: NVIDIA Corporation Device [10de:032b]
InstallationDate: Installed on 2014-04-22 (13 days ago)
InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
MachineType: Dell Inc. Precision WorkStation T5400
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-24-generic 
root=UUID=299f54b4-526c-4504-bb50-4cec781e78cd ro quiet splash vt.handoff=7
SourcePackage: xorg
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 05/23/2011
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A09
dmi.board.name: 0RW203
dmi.board.vendor: Dell Inc.
dmi.board.version: A01
dmi.chassis.type: 7
dmi.chassis.vendor: Dell Inc.
dmi.modalias: 
dmi:bvnDellInc.:bvrA09:bd05/23/2011:svnDellInc.:pnPrecisionWorkStationT5400:pvr:rvnDellInc.:rn0RW203:rvrA01:cvnDellInc.:ct7:cvr:
dmi.product.name: Precision WorkStation T5400
dmi.sys.vendor: Dell Inc.
version.compiz: compiz 1:0.9.11+14.04.20140409-0ubuntu1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.52-1
version.libgl1-mesa-dri: libgl1-mesa-dri 10.1.0-4ubuntu5
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 10.1.0-4ubuntu5
version.xserver-xorg-core: xserver-xorg-core 2:1.15.1-0ubuntu2
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.8.2-1ubuntu2
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.3.0-1ubuntu3
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.910-0ubuntu1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.10-1ubuntu2
xserver.bootTime: Mon May  5 11:45:59 2014
xserver.configfile: default
xserver.errors:
 Failed to load module "nvidia" (module does not exist, 0)
 Failed to load module "nvidia" (module does not exist, 0)
xserver.logfile: /var/log/Xorg.0.log
xserver.version: 2:1.15.1-0ubuntu2
xserver.video_driver: nouveau

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


** Tags: amd64 apport-bug compiz-0.9 trusty ubuntu

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https://bugs.launchpad.net/bugs/1316263

Title:
  ubuntu 14.04 not comming out of lock, sometimes

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