Public bug reported:

Steps to reproduce: 
On a Thinkpad X1 Carbon running 18.04 bionic
Attempt to suspend (using the the 'manual suspend' option from Gnome settings, 
hold down 'power' until changes to 'pause' symbol')

Expected behaviour:
machine goes into suspend state, display off, fans off, power led blinking 
slowing to indicate can be woken only by pressing power button


Actual behaviour:
- display goes off
- fans shut down
- physical power button led starts to flash slowing
- i.e.  machine otherwise appears to go into normal 'suspend' state
- however, after approximate 1 second, without touching anything:
- the display wakes back up at the lock screen
- power led comes back on full
- machine is back out of suspend, without touching keys or mouse

Other notes:
- would appear to be 18.04 specific, as works find under 18.10
- Lenovo bios version 1.35

Possibly similiar to 
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1797364
but they report removing TLP solves problem (my machine does not have TLP 
installed) and they report dmesg errors that I do not see.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: linux-image-4.15.0-39-generic 4.15.0-39.42
ProcVersionSignature: Ubuntu 4.15.0-39.42-generic 4.15.18
Uname: Linux 4.15.0-39-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.9-0ubuntu7.5
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC0:  dchalmers   3237 F.... pulseaudio
CurrentDesktop: ubuntu:GNOME
Date: Wed Dec  5 09:00:25 2018
InstallationDate: Installed on 2018-11-22 (12 days ago)
InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
Lsusb:
 Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
 Bus 001 Device 004: ID 138a:0097 Validity Sensors, Inc. 
 Bus 001 Device 003: ID 13d3:5682 IMC Networks 
 Bus 001 Device 002: ID 8087:0a2b Intel Corp. 
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
MachineType: LENOVO 20HRCTO1WW
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_GB.UTF-8
 SHELL=/bin/bash
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.15.0-39-generic 
root=/dev/mapper/system-root ro quiet splash vt.handoff=1
RelatedPackageVersions:
 linux-restricted-modules-4.15.0-39-generic N/A
 linux-backports-modules-4.15.0-39-generic  N/A
 linux-firmware                             1.173.2
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 09/10/2018
dmi.bios.vendor: LENOVO
dmi.bios.version: N1MET50W (1.35 )
dmi.board.asset.tag: Not Available
dmi.board.name: 20HRCTO1WW
dmi.board.vendor: LENOVO
dmi.board.version: SDK0J40709 WIN
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: None
dmi.modalias: 
dmi:bvnLENOVO:bvrN1MET50W(1.35):bd09/10/2018:svnLENOVO:pn20HRCTO1WW:pvrThinkPadX1Carbon5th:rvnLENOVO:rn20HRCTO1WW:rvrSDK0J40709WIN:cvnLENOVO:ct10:cvrNone:
dmi.product.family: ThinkPad X1 Carbon 5th
dmi.product.name: 20HRCTO1WW
dmi.product.version: ThinkPad X1 Carbon 5th
dmi.sys.vendor: LENOVO

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug bionic

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https://bugs.launchpad.net/bugs/1806947

Title:
  Machine will not correctly enter Suspend state (Thinkpad X1 5th gen,
  18.04)

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