[Bug 1801743] Re: Suspend fails in Kubuntu 18.04 but works fine in Kubuntu 17.10

This bug affects me as well, on a Dell Latitude E7440 (is this a Dell
problem?). In my case, the bug started to appear with kernel 4.15.0-36
(and has been present in all later updates), both on 16.04 with the
latest HWE and now with 18.04. For the time being I am using kernel
4.15.0-34, which is stable.

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https://bugs.launchpad.net/bugs/1801743

Title:
Suspend fails in Kubuntu 18.04 but works fine in Kubuntu 17.10

Status in linux package in Ubuntu:
Confirmed

Bug description:
After upgrading to kubuntu 18.04 resuming from suspend fails in most
cases on my laptop. When trying to resume the power LED is turned on,
but the screen stays black and the system does not respond at all.
Switching to another virtual terminal is not possible and closing the
lid again does not show any effect. The hardware is a Dell Latitude
e7440 with core i7 4600U and intel graphics only. The only way to
change the status is a hard shut-down by long pressing the power
button. The last message in kern.log is:

PM: suspend entry (deep)

The described problem is similar to bug #1774950. However, the latter
is considered to be fixed with kernel 4.15.0-38 while my problem
persists with this kernel.

Output of 'sudo lspci -vnvn' is attached, the result of 'cat
/proc/version_signature' is:

Ubuntu 4.15.0-38.41-generic 4.15.18
---
ProblemType: Bug
ApportVersion: 2.20.9-0ubuntu7.4
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC1: graeser 2116 F.... pulseaudio
/dev/snd/controlC0: graeser 2116 F.... pulseaudio
CurrentDesktop: KDE
DistributionChannelDescriptor:
# This is a distribution channel descriptor
# For more information see http://wiki.ubuntu.com/DistributionChannelDescriptor
canonical-oem-somerville-precise-amd64-20130203-1
DistroRelease: Ubuntu 18.04
EcryptfsInUse: Yes
HibernationDevice: RESUME=none
InstallationDate: Installed on 2014-03-20 (1690 days ago)
InstallationMedia: Ubuntu 12.04 "Precise" - Build amd64 LIVE Binary 20130203-13:50
MachineType: Dell Inc. Latitude E7440
Package: linux (not installed)
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-38-generic root=UUID=25e09413-4977-401f-a034-0465b444518b ro quiet splash vt.handoff=1
ProcVersionSignature: Ubuntu 4.15.0-38.41-generic 4.15.18
RelatedPackageVersions:
linux-restricted-modules-4.15.0-38-generic N/A
linux-backports-modules-4.15.0-38-generic N/A
linux-firmware 1.173.1
Tags: bionic
Uname: Linux 4.15.0-38-generic x86_64
UpgradeStatus: Upgraded to bionic on 2018-10-15 (20 days ago)
UserGroups: adm cdrom dip docker lpadmin plugdev sambashare sudo
_MarkForUpload: True
dmi.bios.date: 02/02/2015
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A14
dmi.board.name: 0WK2DM
dmi.board.vendor: Dell Inc.
dmi.chassis.type: 9
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvrA14:bd02/02/2015:svnDellInc.:pnLatitudeE7440:pvr01:rvnDellInc.:rn0WK2DM:rvr:cvnDellInc.:ct9:cvr:
dmi.product.name: Latitude E7440
dmi.product.version: 01
dmi.sys.vendor: Dell Inc.

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