Unable to restart or shutdown from lightdm login screen if 'switch user' is selected from lock screen

[coversnail]

Firstly apologies if this is in the wrong place, or just me being stupid!

I cannot restart or shutdown my computer from the LightDM login screen, this problem occurs if I go through the following steps:

    Log in
    Lock the screen either through inactivity or selecting "lock screen"
    At the password entry screen select "Switch User"
    Click the power symbol at the top right of the LightDM login screen and select "restart" or "shutdown"

When I do this nothing happens, the computer does not restart or shutdown and neither is there any error messages. Both functions work from a reboot of the system at the initial LightDM login screen, however if I log into a session and let the screen lock, then select 'switch user', neither function works.

I am using Ubuntu 11.10

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: lightdm 1.0.6-0ubuntu1.2
ProcVersionSignature: Ubuntu 3.0.0-16.28-generic 3.0.17
Uname: Linux 3.0.0-16-generic x86_64
ApportVersion: 1.23-0ubuntu4
Architecture: amd64
Date: Wed Feb 15 12:43:05 2012
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
SourcePackage: lightdm
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

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

[Ernst Persson (ernstp)]

This also happens for me on Precise.