Laptop will not suspend when lid is closed

[Scott Abbey]

My Dell XPS M1530 will not suspend when the lid is closed. The settings are all appropriately set. The lid close and open events are being recognized by dbus, but for some reason, GPM is ignoring the lid close. Suspend works fine if I choose "Suspend" from the menu or if I manually issue 'pm-suspend'. It wakes from suspend just fine when the lid is opened. upower does not show the laptop as docked, so I don't believe this is related to #933710

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: gnome-power-manager 3.3.3-0ubuntu1
ProcVersionSignature: Ubuntu 3.2.0-18.28-generic 3.2.9
Uname: Linux 3.2.0-18-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 1.94-0ubuntu1
Architecture: amd64
Date: Mon Mar 5 14:37:08 2012
EcryptfsInUse: Yes
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Beta amd64 (20120227.1)
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: gnome-power-manager
UpgradeStatus: Upgraded to precise on 2012-03-05 (0 days ago)

[Launchpad Janitor (janitor)]

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