Comment 0 for bug 991637

On a fresh install of Ubuntu 12.04, Unity 5.10.0-0ubuntu6, if I switch my display settings from non-mirrored to mirrored, the launcher vanishes. Note that I have the launcher "auto-hide" setting disabled, so it should always be visible.

Steps to reproduce:
* Open System Settings -> Displays.
* Ensure "Mirror displays" checkbox is unchecked, a resolution common to both monitors is selected, and launcher placement is set to "All displays"; if this was not previously true, click "Apply" and "Keep these settings".
* Check "Mirror displays" checkbox, and click "Apply".
* Unity launcher vanishes. The only way I've found to restore it is to switch back to non-mirrored mode.

Other applications are affected by the switch to mirrored mode. If a window is maximized prior to the mirroring, often it will take up a narrow vertical strip (maybe 20 pixels wide) on the right side of the screen - de-maximizing restores restores it to a window, but re-maximizing restores it to the narrow vertical strip.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: unity 5.10.0-0ubuntu6
ProcVersionSignature: Ubuntu 3.2.0-24.37-generic 3.2.14
Uname: Linux 3.2.0-24-generic x86_64
ApportVersion: 2.0.1-0ubuntu7
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: Sun Apr 29 21:22:41 2012
EcryptfsInUse: Yes
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425)
ProcEnviron:
 LANGUAGE=en_CA:en
 PATH=(custom, no user)
 LANG=en_CA.UTF-8
 SHELL=/bin/bash
SourcePackage: unity
UpgradeStatus: No upgrade log present (probably fresh install)