Public bug reported:

1)cplummer@cplummer-dl:~$ lsb_release -rd
Description:    Ubuntu 13.10
Release:        13.10

2) 
cplummer@cplummer-dl:~$ sudo apt-cache policy xorg
xorg:
  Installed: 1:7.7+1ubuntu6
  Candidate: 1:7.7+1ubuntu6
  Version table:
 *** 1:7.7+1ubuntu6 0
        500 http://us.archive.ubuntu.com/ubuntu/ saucy/main amd64 Packages
        100 /var/lib/dpkg/status

I have a dual monitor set up with a Dell T5500 and an Nvidia Quadro NVS
295 graphics card.  I lock the screen with a window open on the second
monitor, then unlock it again.  When the desktop shows again, the
windows that were on the second screen are gone offscreen.  I expected
them to still be on the second screen - I can workaround this by using
Alt+Spacebar to move the window back.  This happens every time I lock
the screen, and it happens if I use the Nouveau driver or if I use the
proprietary driver.

3) I expected the windows on the second screen to stay on the screen after 
unlocking the system.
4) Instead, the windows disappeared off-screen - the Unity launcher still shows 
them being open, plus if I have multiple windows of an application open (i.e. 
the terminal), then double click the launcher icon, then it shows me all the 
windows and lets me choose one to bring forward, even the ones offscreen.  When 
I pick the offscreen one to bring forward, its icon just shoots offscreen again.

ProblemType: Bug
DistroRelease: Ubuntu 13.10
Package: xorg 1:7.7+1ubuntu6
ProcVersionSignature: Ubuntu 3.11.0-14.21-generic 3.11.7
Uname: Linux 3.11.0-14-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  319.32  Wed Jun 19 15:51:20 
PDT 2013
 GCC version:  gcc version 4.8.1 (Ubuntu/Linaro 4.8.1-10ubuntu9)
.tmp.unity.support.test.0:
 
ApportVersion: 2.12.5-0ubuntu2.1
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
Date: Tue Dec  3 09:51:37 2013
DistUpgraded: Fresh install
DistroCodename: saucy
DistroVariant: ubuntu
DkmsStatus:
 nvidia-319, 319.32, 3.11.0-13-generic, x86_64: installed
 nvidia-319, 319.32, 3.11.0-14-generic, x86_64: installed
ExtraDebuggingInterest: Yes
GraphicsCard:
 NVIDIA Corporation G98 [Quadro NVS 295] [10de:06fd] (rev a1) (prog-if 00 [VGA 
controller])
   Subsystem: NVIDIA Corporation Device [10de:062e]
InstallationDate: Installed on 2013-11-27 (5 days ago)
InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
MachineType: Dell Inc. Precision WorkStation T5500
MarkForUpload: True
ProcEnviron:
 SHELL=/bin/bash
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 LANGUAGE=en_US
 XDG_RUNTIME_DIR=<set>
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.11.0-14-generic 
root=UUID=b56473e8-ada5-4f33-bd1a-ea5d818c8ecf ro quiet splash
SourcePackage: xorg
Symptom: display
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 09/16/2010
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A06
dmi.board.name: 0D883F
dmi.board.vendor: Dell Inc.
dmi.board.version: A06
dmi.chassis.type: 7
dmi.chassis.vendor: Dell Inc.
dmi.modalias: 
dmi:bvnDellInc.:bvrA06:bd09/16/2010:svnDellInc.:pnPrecisionWorkStationT5500:pvr:rvnDellInc.:rn0D883F:rvrA06:cvnDellInc.:ct7:cvr:
dmi.product.name: Precision WorkStation T5500
dmi.sys.vendor: Dell Inc.
version.compiz: compiz 1:0.9.10+13.10.20131011-0ubuntu1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.46-1ubuntu1
version.libgl1-mesa-dri: libgl1-mesa-dri 9.2.1-1ubuntu3
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 9.2.1-1ubuntu3
version.nvidia-graphics-drivers: nvidia-graphics-drivers N/A
version.xserver-xorg-core: xserver-xorg-core 2:1.14.3-3ubuntu2
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.7.3-0ubuntu3.1
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.2.0-0ubuntu10
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.904-0ubuntu2
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.9-2ubuntu1
xserver.bootTime: Tue Dec  3 09:18:08 2013
xserver.configfile: default
xserver.devices:
 input        Power Button         KEYBOARD, id 6
 input        Power Button         KEYBOARD, id 7
 input        Dell Dell QuietKey Keyboard KEYBOARD, id 8
 input        USB Optical Mouse    MOUSE, id 9
 input        Dell WMI hotkeys     KEYBOARD, id 10
xserver.errors: open /dev/fb0: No such file or directory
xserver.logfile: /var/log/Xorg.0.log
xserver.outputs:
 
xserver.version: 2:1.14.3-3ubuntu2

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


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

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which is subscribed to xorg in Ubuntu.
https://bugs.launchpad.net/bugs/1257327

Title:
  Ubuntu 13.10 dual monitor screen lock causes windows to disappear off-
  screen

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https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1257327/+subscriptions

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