I can't reproduce the issue on the XPS 9360 at my hand, which
unfortunately is not the mass production one, with both BIOS 2.3.1 (the
version you currently used) and 2.4.2.

The TBT's XHCI HC failed to suspend,
[   87.718350] xhci_hcd 0000:39:00.0: WARN: xHC CMD_RUN timeout
[   87.718372] suspend_common(): xhci_pci_suspend+0x0/0xd0 returns -110
[   87.718377] pci_pm_suspend(): hcd_pci_suspend+0x0/0x30 returns -110
[   87.718385] dpm_run_callback(): pci_pm_suspend+0x0/0x130 returns -110
[   87.718391] PM: Device 0000:39:00.0 failed to suspend async: error -110

Also we can see that:
01:00.0 PCI bridge [0604]: Intel Corporation DSL6340 Thunderbolt 3 Bridge 
[Alpine Ridge 2C 2015] [8086:1576] (rev ff) (prog-if ff)
        !!! Unknown header type 7f
        Kernel driver in use: pcieport
        Kernel modules: shpchp

02:00.0 PCI bridge [0604]: Intel Corporation DSL6340 Thunderbolt 3 Bridge 
[Alpine Ridge 2C 2015] [8086:1576] (rev ff) (prog-if ff)
        !!! Unknown header type 7f
        Kernel driver in use: pcieport
        Kernel modules: shpchp

02:01.0 PCI bridge [0604]: Intel Corporation DSL6340 Thunderbolt 3 Bridge 
[Alpine Ridge 2C 2015] [8086:1576] (rev ff) (prog-if ff)
        !!! Unknown header type 7f
        Kernel driver in use: pcieport
        Kernel modules: shpchp

02:02.0 PCI bridge [0604]: Intel Corporation DSL6340 Thunderbolt 3 Bridge 
[Alpine Ridge 2C 2015] [8086:1576] (rev ff) (prog-if ff)
        !!! Unknown header type 7f
        Kernel driver in use: pcieport
        Kernel modules: shpchp

03:00.0 System peripheral [0880]: Intel Corporation DSL6340 Thunderbolt 3 NHI 
[Alpine Ridge 2C 2015] [8086:1575] (rev ff) (prog-if ff)
        !!! Unknown header type 7f
        Kernel driver in use: thunderbolt
        Kernel modules: thunderbolt

39:00.0 USB controller [0c03]: Intel Corporation DSL6340 USB 3.1 Controller 
[Alpine Ridge] [8086:15b5] (rev ff) (prog-if ff)
        !!! Unknown header type 7f
        Kernel driver in use: xhci_hcd

All these PCI devices are not responsive.

Can you attach the output `lspci` right after boot, without plugging any
USB-C/TBT device?

Also, can you upgrade your BIOS and Thunderbolt firmware? Hopefully this
can fix the issue.

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You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1738224

Title:
  Suspend broken after kernel upgrade

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  My machine (XPS 13 9360) won't go into suspend properly after
  upgrading from linux-image-4.13.0-17-generic to linux-
  image-4.13.0-19-generic.

  This affects both suspend through lid close and "systemctl suspend".
  Screen goes off, power led remains lit. Then after some time the
  screen comes back on, is stuck and lets me wait for a few before
  becoming responsive again.

  Booting back into 4.13.0-17 resolved the issue.
  --- 
  ApportVersion: 2.20.7-0ubuntu3.6
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  jeffrey    1963 F.... pulseaudio
  CurrentDesktop: GNOME
  DistroRelease: Ubuntu 17.10
  HibernationDevice: RESUME=UUID=0253ffe9-bdbf-4825-b583-e8055f7bffe5
  InstallationDate: Installed on 2017-10-18 (56 days ago)
  InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Release amd64 (20171017.1)
  MachineType: Dell Inc. XPS 13 9360
  Package: linux (not installed)
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.13.0-19-generic.efi.signed 
root=/dev/mapper/ubuntu--vg-root ro quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 4.13.0-19.22-generic 4.13.13
  RelatedPackageVersions:
   linux-restricted-modules-4.13.0-19-generic N/A
   linux-backports-modules-4.13.0-19-generic  N/A
   linux-firmware                             1.169.1
  Tags:  artful wayland-session
  Uname: Linux 4.13.0-19-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip docker input libvirt lpadmin plugdev sambashare sudo
  _MarkForUpload: True
  dmi.bios.date: 10/03/2017
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: 2.3.1
  dmi.board.name: 0839Y6
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 9
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: 
dmi:bvnDellInc.:bvr2.3.1:bd10/03/2017:svnDellInc.:pnXPS139360:pvr:rvnDellInc.:rn0839Y6:rvrA00:cvnDellInc.:ct9:cvr:
  dmi.product.family: XPS
  dmi.product.name: XPS 13 9360
  dmi.sys.vendor: Dell Inc.

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