Public bug reported:

1)
Description:    Ubuntu 16.04 LTS
Release:        16.04

* 2 Monitor Setup (onboard HDMI, onboard DVI)
* both Monitors @ 1920x1080

2)
unity:
  installed:           7.4.0+16.04.20160415-0ubuntu1
  installation candidate: 7.4.0+16.04.20160415-0ubuntu1
  version table:
 *** 7.4.0+16.04.20160415-0ubuntu1 500
        500 http://mirror.netcologne.de/ubuntu xenial/main amd64 Packages
        100 /var/lib/dpkg/status

3)
After a screen lock (SUPER + L), display turning off after given time out and 
then reactivate display by pressing (CTRL) and logging in, all windows on every 
workspace are on different location if they were not maximised sometimes they 
are on different workspaces then before.

4)
I expected all windows after screen lock at the same position then before

Screenshots before/after

Before screen lock + time out for monitor turn off
http://i.imgur.com/PtbHMMg.png

After turn on monitor + logging in
http://i.imgur.com/f5EYZGa.png

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: unity 7.4.0+16.04.20160415-0ubuntu1
ProcVersionSignature: Ubuntu 4.4.0-22.39-generic 4.4.8
Uname: Linux 4.4.0-22-generic x86_64
.tmp.unity_support_test.0:
 
ApportVersion: 2.20.1-0ubuntu2
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  9 10:38:25 2016
DistUpgraded: 2016-04-22 11:12:25,305 ERROR got error from PostInstallScript 
./xorg_fix_proprietary.py (g-exec-error-quark: Kindprozess 
»./xorg_fix_proprietary.py« konnte nicht ausgeführt werden (No such file or 
directory) (8))
DistroCodename: xenial
DistroVariant: ubuntu
EcryptfsInUse: Yes
GraphicsCard:
 Intel Corporation Xeon E3-1200 v3/4th Gen Core Processor Integrated Graphics 
Controller [8086:0412] (rev 06) (prog-if 00 [VGA controller])
   Subsystem: ASRock Incorporation Xeon E3-1200 v3/4th Gen Core Processor 
Integrated Graphics Controller [1849:0412]
InstallationDate: Installed on 2015-11-04 (186 days ago)
InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
MachineType: To Be Filled By O.E.M. To Be Filled By O.E.M.
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.4.0-22-generic.efi.signed 
root=/dev/mapper/ubuntu--vg-root ro noprompt quiet splash vt.handoff=7
SourcePackage: unity
UpgradeStatus: Upgraded to xenial on 2016-04-22 (16 days ago)
dmi.bios.date: 07/02/2014
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: P1.90
dmi.board.name: H81M-HDS
dmi.board.vendor: ASRock
dmi.chassis.asset.tag: To Be Filled By O.E.M.
dmi.chassis.type: 3
dmi.chassis.vendor: To Be Filled By O.E.M.
dmi.chassis.version: To Be Filled By O.E.M.
dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvrP1.90:bd07/02/2014:svnToBeFilledByO.E.M.:pnToBeFilledByO.E.M.:pvrToBeFilledByO.E.M.:rvnASRock:rnH81M-HDS:rvr:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
dmi.product.name: To Be Filled By O.E.M.
dmi.product.version: To Be Filled By O.E.M.
dmi.sys.vendor: To Be Filled By O.E.M.
version.compiz: compiz 1:0.9.12.2+16.04.20160415-0ubuntu1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.67-1
version.libgl1-mesa-dri: libgl1-mesa-dri 11.2.0-1ubuntu2
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 11.2.0-1ubuntu2
version.xserver-xorg-core: xserver-xorg-core 2:1.18.3-1ubuntu2
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.10.1-1ubuntu2
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.7.0-1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 
2:2.99.917+git20160325-1ubuntu1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.12-1build2
xserver.bootTime: Mon May  9 08:43:17 2016
xserver.configfile: default
xserver.errors:
 
xserver.logfile: /var/log/Xorg.0.log
xserver.outputs:
 product id                               41124 
 vendor                                     DEL
xserver.version: 2:1.18.3-1ubuntu2

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


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

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https://bugs.launchpad.net/bugs/1579678

Title:
  ubuntu unity workspace switcher state reset after screen lock

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