PM-Hibernate does nothing on Dell N5110

I installed pm-utils, then ran sudo pm-hibernate, which simply made the screen flash, and nothing else happened.

A workaround seems to be to edit the file /etc/pm/config.d/defaults (create if it doesn't exist), then add the line...
HIBERNATE_MODE="shutdown"
...and after this, sudo pm-hibernate successfully hibernates the system.

To make this change integrated with the desktop (make hibernate appear in the menus) you edit a policykit file, following the highest-voted solution at...
http://askubuntu.com/questions/94754/how-to-enable-hibernation

...and after a restart there should be new options and you should be able to use them within the power management routines of Ubuntu (Gnome in my case). Rebooting now.

ProblemType: Bug
DistroRelease: Ubuntu 13.10
Package: pm-utils 1.4.1-12ubuntu1
ProcVersionSignature: Ubuntu 3.11.0-13.20-generic 3.11.6
Uname: Linux 3.11.0-13-generic i686
ApportVersion: 2.12.5-0ubuntu2.1
Architecture: i386
Date: Wed Nov 27 16:04:06 2013
InstallationDate: Installed on 2013-10-29 (29 days ago)
InstallationMedia: Ubuntu-GNOME 13.10 "Saucy Salamander" - Release i386 (20131017)
MarkForUpload: True
PackageArchitecture: all
ProcEnviron:
 LANGUAGE=en_GB:en
 TERM=xterm
 PATH=(custom, no user)
 LANG=en_GB.UTF-8
 SHELL=/bin/bash
SourcePackage: pm-utils
UpgradeStatus: No upgrade log present (probably fresh install)