Public bug reported:

When I add a second (external) display to my laptop (Dell Latitude) the
wallpaper/background is not resized correctly.

1. just an internal display with a resolution of 1366x768
2. adding an external display with a full HD resolution

Adding the external display results in
- the wallper is shown in the upper left corner of the external display 
(probably with the resolution of the internal display.
- The rest of the screen is filled with random segments of windows that have 
been shown at these positions before
- the internal display does not show any wallpaper (completely black)

Additionally it looks like the left side panels (one for internal and
one for external) are drawn over each other on the external display. See
attachment Auswal_001.png

Deactivating the internal display does not change anything

Locking the screen shows a correctly resized wallpaper in the

ProblemType: Bug
DistroRelease: Ubuntu 16.10
Package: xorg 1:7.7+13ubuntu4
ProcVersionSignature: Ubuntu 4.8.0-22.24-generic 4.8.0
Uname: Linux 4.8.0-22-generic x86_64
ApportVersion: 2.20.3-0ubuntu8
Architecture: amd64
BootLog: /dev/sda6: clean, 1281257/10911744 files, 22096310/43622400 blocks
CompizPlugins: No value set for 
CompositorRunning: compiz
CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
CompositorUnredirectFSW: true
CurrentDesktop: Unity
Date: Mon Oct 17 20:23:39 2016
DistUpgraded: Fresh install
DistroCodename: yakkety
DistroVariant: ubuntu
 virtualbox, 5.1.6, 4.8.0-21-generic, x86_64: installed
 virtualbox, 5.1.6, 4.8.0-22-generic, x86_64: installed
EcryptfsInUse: Yes
ExtraDebuggingInterest: Yes
 Intel Corporation 2nd Generation Core Processor Family Integrated Graphics 
Controller [8086:0126] (rev 09) (prog-if 00 [VGA controller])
   Subsystem: Dell 2nd Generation Core Processor Family Integrated Graphics 
Controller [1028:04a9]
InstallationDate: Installed on 2013-11-10 (1072 days ago)
InstallationMedia: elementary OS 0.2 "Luna" - Stable amd64 (20130810)
MachineType: Dell Inc. Latitude E6220
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.8.0-22-generic 
root=UUID=f1d78d25-23cf-4217-9db2-0750a8eb2b53 ro quiet splash vt.handoff=7
SourcePackage: xorg
Symptom: display
UpgradeStatus: No upgrade log present (probably fresh install) 05/17/2012
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A08 0R97MN
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 9
dmi.chassis.vendor: Dell Inc.
dmi:bvnDellInc.:bvrA08:bd05/17/2012:svnDellInc.:pnLatitudeE6220:pvr01:rvnDellInc.:rn0R97MN:rvrA00:cvnDellInc.:ct9:cvr: Latitude E6220
dmi.product.version: 01
dmi.sys.vendor: Dell Inc.
version.compiz: compiz 1:
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.70-1
version.libgl1-mesa-dri: libgl1-mesa-dri 12.0.3-1ubuntu2
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 12.0.3-1ubuntu2
version.xserver-xorg-core: xserver-xorg-core 2:1.18.4-1ubuntu6
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.10.2-1ubuntu1
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.7.1-1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.12-2

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

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

** Attachment added: "drawn over each other"

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  Wallpaper does not resize correctly when adding external display

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