machine suspending when it shouldn't

A couple of my machines keep suspending despite being plugged in and having system power setting to suspend never.

This is really inconvenient as I remotely log into these machines.

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: pm-utils 1.4.1-8ubuntu1
ProcVersionSignature: Ubuntu 3.0.0-12.19-generic 3.0.4
Uname: Linux 3.0.0-12-generic x86_64
ApportVersion: 1.23-0ubuntu2
Architecture: amd64
CheckboxSubmission: 634e340822dbba19cfc2dc121e877bff
CheckboxSystem: bb422ca46d02494cdbc459927a98bc2f
Date: Fri Sep 30 10:58:22 2011
EcryptfsInUse: Yes
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release amd64 (20110427.1)
PackageArchitecture: all
ProcEnviron:
 PATH=(custom, user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: pm-utils
UpgradeStatus: Upgraded to oneiric on 2011-07-06 (85 days ago)