machine wakes immediately after /usr/sbin/pm-suspend

[mike-g2]

pm-suspend has stopped working after recent apt upgrade. Instead of suspending, it goes through the motions but then restarts again.

Then only issue I can see in the dmesg out put is related to

ahci 0000:00:1f.2: port does not support device sleep

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: pm-utils 1.4.1-16
ProcVersionSignature: Ubuntu 4.4.0-101.124-generic 4.4.95
Uname: Linux 4.4.0-101-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.13
Architecture: amd64
CurrentDesktop: MATE
Date: Tue Dec 5 15:52:01 2017
InstallationDate: Installed on 2016-09-08 (453 days ago)
InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
PackageArchitecture: all
SourcePackage: pm-utils
UpgradeStatus: No upgrade log present (probably fresh install)