Despite 'power' settings, system always suspends when idle

In the 'power' section of system settings, I have both 'on battery power' and 'when plugged in' set to 'don't suspend' and 'do nothing' for the available options. In spite of this, the system will suspend when left idle (I don't know the exact duration as it only seems to happen when I sleep or go to work). The setting should be obeyed and is not.

This is for ubuntu 11.10, fully updated as of this morning. I believe the correct package is 'gnome-power-manager'

I expect the settings to be obeyed. They are not.

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: gnome-power-manager 3.2.0-0ubuntu1
ProcVersionSignature: Ubuntu 3.0.0-12.19-generic 3.0.4
Uname: Linux 3.0.0-12-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 1.23-0ubuntu2
Architecture: amd64
Date: Sat Oct 1 00:50:24 2011
EcryptfsInUse: Yes
GnomeSessionIdleInhibited: No
GnomeSessionInhibitors: None
GnomeSessionSuspendInhibited: No
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release amd64 (20101007)
MachineType: System76, Inc. Serval Professional
ProcEnviron:
 PATH=(custom, user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.0.0-12-generic root=UUID=65670618-7c25-4319-b7d7-28423efc7d4a ro quiet splash vt.handoff=7
SourcePackage: gnome-power-manager
UpgradeStatus: Upgraded to oneiric on 2011-09-29 (1 days ago)
dmi.bios.date: 09/28/2010
dmi.bios.vendor: Phoenix Technologies LTD
dmi.bios.version: CALPELLACRB.86C.0000.X.0000000000
dmi.board.asset.tag: Tag 12345
dmi.board.name: Serval Professional
dmi.board.vendor: System76, Inc.
dmi.board.version: serp6
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 9
dmi.chassis.vendor: System76, Inc.
dmi.chassis.version: serp6
dmi.modalias: dmi:bvnPhoenixTechnologiesLTD:bvrCALPELLACRB.86C.0000.X.0000000000:bd09/28/2010:svnSystem76,Inc.:pnServalProfessional:pvrserp6:rvnSystem76,Inc.:rnServalProfessional:rvrserp6:cvnSystem76,Inc.:ct9:cvrserp6:
dmi.product.name: Serval Professional
dmi.product.version: serp6
dmi.sys.vendor: System76, Inc.
gnome-power-bugreport: Error: [Errno 2] No such file or directory