Status changed to 'Confirmed' because the bug affects multiple users.

** Changed in: xorg (Ubuntu)
       Status: New => Confirmed

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  Wallpaper does not resize correctly when adding external display

Status in xorg package in Ubuntu:

Bug description:
  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

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