[Bug 1806947] Re: Machine will not correctly enter Suspend state (Thinkpad X1 5th gen, 18.04)

The issue is fixed by the latest kernel update:
(which my machine received by auto-update today)

Linux version 4.15.0-42-generic (buildd@lgw01-amd64-023) (gcc version
7.3.0 (Ubuntu 7.3.0-16ubuntu3)) #45-Ubuntu SMP Thu Nov 15 19:32:57 UTC
2018 (Ubuntu 4.15.0-42.45-generic 4.15.18)

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

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

Status in linux package in Ubuntu:
Confirmed

Bug description:
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

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