removing second monitor leaves windows mapped off-screen

[Sam Juvonen]

I'm using a laptop (Lenovo T420, intel graphics) with an external monitor. When I remove the laptop from the dock, Displays correctly shows that I now have just the internal monitor active.

However, all existing windows from the external monitor stay mapped to positions off the screen and cannot be activated. This is obviously annoying when going into meetings etc.

1)
$ lsb_release -rd
Description: Ubuntu 12.04.1 LTS
Release: 12.04

2)
$ apt-cache policy unity
unity:
  Installed: 5.14.0-0ubuntu1
  Candidate: 5.14.0-0ubuntu1
  Version table:
 *** 5.14.0-0ubuntu1 0
        500 http://us.archive.ubuntu.com/ubuntu/ precise-updates/main amd64 Packages
        100 /var/lib/dpkg/status
     5.10.0-0ubuntu6 0
        500 http://us.archive.ubuntu.com/ubuntu/ precise/main amd64 Packages

3) Expected:
- have external monitor attached to laptop, extending the desktop to both screens
- remove external monitor (remove laptop from dock)
- all existing windows should be moved to the internal screen so the apps can be accessed

4) What happens:
 - have external monitor attached to laptop, extending the desktop to both screens
- remove external monitor (remove laptop from dock)
- app windows that were on the external monitors are still mapped into those coordinates (I assume) and cannot be chosen.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: unity 5.14.0-0ubuntu1
ProcVersionSignature: Ubuntu 3.2.0-29.46-generic 3.2.24
Uname: Linux 3.2.0-29-generic x86_64
ApportVersion: 2.0.1-0ubuntu12
Architecture: amd64
CompizPlugins: [core,composite,opengl,compiztoolbox,decor,vpswitch,snap,mousepoll,resize,place,move,wall,grid,regex,imgpng,session,gnomecompat,animation,fade,unitymtgrabhandles,workarounds,scale,expo,ezoom,unityshell]
Date: Wed Sep 5 11:51:03 2012
EcryptfsInUse: Yes
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: unity
UpgradeStatus: No upgrade log present (probably fresh install)

[Daniel van Vugt (vanvugt)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. This particular bug has already been reported and is a duplicate of bug 1002246, so it is being marked as such. Please look at the other bug report to see if there is any missing information that you can provide, or to see if there is a workaround for the bug. Additionally, any further discussion regarding the bug should occur in the other report. Feel free to continue to report any other bugs you may find.