Public bug reported:

The dmesg log states the following:
PM: Device 0000:0f:00.0 failed to suspend async: error -110

When checking lspci this points to the following device:
0f:00.0 USB controller: Intel Corporation JHL7540 Thunderbolt 3 USB Controller 
[Titan Ridge 2C 2018] (rev 06)
which is the integrated Thunderbolt 3 Controller of the ITX Motherboard.

I will still try suspending without a Thunderbolt 3 Dock attached.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: linux-image-5.4.0-29-generic 5.4.0-29.33
ProcVersionSignature: Ubuntu 5.4.0-29.33-generic 5.4.30
Uname: Linux 5.4.0-29-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.11-0ubuntu27
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC0:  spyfly     2424 F.... pulseaudio
 /dev/snd/controlC3:  spyfly     2424 F.... pulseaudio
 /dev/snd/controlC1:  spyfly     2424 F.... pulseaudio
 /dev/snd/controlC2:  spyfly     2424 F.... pulseaudio
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Thu May 14 17:09:55 2020
HibernationDevice: RESUME=UUID=3b541ffc-65d1-41a6-87d4-11750893bae2
InstallationDate: Installed on 2018-09-06 (616 days ago)
InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725)
MachineType: To Be Filled By O.E.M. To Be Filled By O.E.M.
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=de_DE.UTF-8
 SHELL=/bin/bash
ProcFB: 0 EFI VGA
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-5.4.0-29-generic 
root=/dev/mapper/ubuntu--vg-root ro quiet splash vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-5.4.0-29-generic N/A
 linux-backports-modules-5.4.0-29-generic  N/A
 linux-firmware                            1.187
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 11/01/2019
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: P1.78
dmi.board.name: X570 Phantom Gaming-ITX/TB3
dmi.board.vendor: ASRock
dmi.chassis.asset.tag: To Be Filled By O.E.M.
dmi.chassis.type: 3
dmi.chassis.vendor: To Be Filled By O.E.M.
dmi.chassis.version: To Be Filled By O.E.M.
dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvrP1.78:bd11/01/2019:svnToBeFilledByO.E.M.:pnToBeFilledByO.E.M.:pvrToBeFilledByO.E.M.:rvnASRock:rnX570PhantomGaming-ITX/TB3:rvr:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
dmi.product.family: To Be Filled By O.E.M.
dmi.product.name: To Be Filled By O.E.M.
dmi.product.sku: To Be Filled By O.E.M.
dmi.product.version: To Be Filled By O.E.M.
dmi.sys.vendor: To Be Filled By O.E.M.

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


** Tags: amd64 apport-bug focal

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https://bugs.launchpad.net/bugs/1878635

Title:
  Intel Titan Ridge TB3 USB Controller prevents system from suspending

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