Public bug reported:

With an un-mirrored dual display setup, the Unity launcher appears on
both screens under different circumstances.  Whichever display the mouse
cursor is currently on will show the launcher if the unity button is
pressed.  The left side auto-reveal works intermittently on the external
display and not at all on the internal.  The left side of the external
display is "sticky" for the mouse cursor, which presents a problem when
trying to traverse to internal display which is configured to the left
of the external.  It's also proved intermittently impossible to drag
applications from the external to internal display, applications get
stuck on the left screen edge and maximize rather than dragging.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: xorg 1:7.6+10ubuntu1
ProcVersionSignature: Ubuntu 3.2.0-14.23-generic 3.2.3
Uname: Linux 3.2.0-14-generic x86_64
.tmp.unity.support.test.0:
 
ApportVersion: 1.91-0ubuntu1
Architecture: amd64
CompizPlugins: 
[core,bailer,detection,composite,opengl,compiztoolbox,decor,vpswitch,mousepoll,wall,grid,gnomecompat,move,snap,imgpng,place,regex,session,resize,animation,fade,scale,expo,ezoom,workarounds,unityshell]
CompositorRunning: compiz
Date: Mon Feb  6 09:41:15 2012
DistUpgraded: Log time: 2012-01-23 20:14:22.707046
DistroCodename: precise
DistroVariant: ubuntu
ExtraDebuggingInterest: Yes, whatever it takes to get this fixed in Ubuntu
GraphicsCard:
 Intel Corporation Core Processor Integrated Graphics Controller [8086:0046] 
(rev 18) (prog-if 00 [VGA controller])
   Subsystem: CLEVO/KAPOK Computer Device [1558:3100]
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release amd64 (20110427.1)
MachineType: System76, Inc. Lemur UltraThin
ProcEnviron:
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-14-generic 
root=UUID=76263c27-8a91-477d-952a-f31401620601 ro quiet splash vt.handoff=7
SourcePackage: xorg
Symptom: display
UpgradeStatus: Upgraded to precise on 2012-02-06 (0 days ago)
dmi.bios.date: 11/11/2010
dmi.bios.vendor: Phoenix Technologies LTD
dmi.bios.version: CALPELLACRB.86C.0000.X.0000000000
dmi.board.asset.tag: Tag 12345
dmi.board.name: Lemur UltraThin
dmi.board.vendor: System76, Inc.
dmi.board.version: lemu2
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: System76, Inc.
dmi.chassis.version: lemu2
dmi.modalias: 
dmi:bvnPhoenixTechnologiesLTD:bvrCALPELLACRB.86C.0000.X.0000000000:bd11/11/2010:svnSystem76,Inc.:pnLemurUltraThin:pvrlemu2:rvnSystem76,Inc.:rnLemurUltraThin:rvrlemu2:cvnSystem76,Inc.:ct10:cvrlemu2:
dmi.product.name: Lemur UltraThin
dmi.product.version: lemu2
dmi.sys.vendor: System76, Inc.
version.compiz: compiz 1:0.9.6+bzr20110929-0ubuntu8
version.ia32-libs: ia32-libs 20090808ubuntu33
version.libdrm2: libdrm2 2.4.30-1ubuntu1
version.libgl1-mesa-dri: libgl1-mesa-dri 8.0~rc2-0ubuntu4
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 8.0~rc2-0ubuntu4
version.xserver-xorg-core: xserver-xorg-core 2:1.11.3-0ubuntu10
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.6.99.901-1ubuntu3
version.xserver-xorg-video-ati: xserver-xorg-video-ati 
1:6.14.99~git20111219.aacbd629-0ubuntu2
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.17.0-1ubuntu3
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 
1:0.0.16+git20111201+b5534a1-1build2

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


** Tags: amd64 apport-bug compiz-0.9 precise reproducible running-unity 
single-occurrence ubuntu

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https://bugs.launchpad.net/bugs/927662

Title:
  Unity launcher appears on both displays

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