Public bug reported:

Linux kernel version 4.4.0-59-generic. Since a few weeks ago
(approximately the start of 2017 I think) suspend, whether triggered by
pm-suspend or other means, causes the computer to shutdown, not suspend.

I have tried various kernel options such as "dis_ucode_ldr" and
"acpi_sleep=nonvs", suggestions found in various posts on the web, but
the behaviour persists.

lsb_release -rd:
Description:    Ubuntu 16.04.1 LTS
Release:        16.04

pm-utils:
  Installed: 1.4.1-16
  Candidate: 1.4.1-16
  Version table:
 *** 1.4.1-16 500
        500 http://za.archive.ubuntu.com/ubuntu xenial/main amd64 Packages
        500 http://za.archive.ubuntu.com/ubuntu xenial/main i386 Packages
        100 /var/lib/dpkg/status


linux-image-4.4.0-59-generic:
  Installed: 4.4.0-59.80
  Candidate: 4.4.0-59.80
  Version table:
 *** 4.4.0-59.80 500
        500 http://za.archive.ubuntu.com/ubuntu xenial-updates/main amd64 
Packages
        500 http://security.ubuntu.com/ubuntu xenial-security/main amd64 
Packages
        100 /var/lib/dpkg/status

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: pm-utils 1.4.1-16
ProcVersionSignature: Ubuntu 4.4.0-59.80-generic 4.4.35
Uname: Linux 4.4.0-59-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.5
Architecture: amd64
CurrentDesktop: Unity
Date: Wed Jan 25 22:14:11 2017
EcryptfsInUse: Yes
InstallationDate: Installed on 2016-08-17 (161 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)

** Affects: pm-utils (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug xenial

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https://bugs.launchpad.net/bugs/1659415

Title:
  pm-suspend causes computer to shutdown (Dell XPS 15 9550)

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