This is actually no longer happening on my machine with more recent kernels 
(e.g. 6.8.0-41 at the moment).
I also never used a vendor kernel.

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https://bugs.launchpad.net/bugs/2065005

Title:
  ThinkPad P16s fails to resume from suspend sometimes [6.8]

Status in linux package in Ubuntu:
  New
Status in linux source package in Noble:
  New

Bug description:
  On a ThinkPad P16s running Noble, resuming from suspend fails about
  10% of the time. This usually leads to a reboot, and more rarely to a
  hang that requires forcing a power off.

  I don't recall this being the case with kernel 6.5 in Mantic.

  How to reproduce:
  * suspend the laptop (systemctl suspend, via the Gnome GUI, closing the lid, 
method doesn't matter)
  * resume
  * repeat about 10 times

  A quick look at kernel logs doesn't show any kernel panic so perhaps
  the issue happens too early in the resume process for dmesg to be
  updated.

  This happens on both (at least) 6.8.0-31 and 6.8.0-28.

  ProblemType: Bug
  DistroRelease: Ubuntu 24.04
  Package: linux-image-6.8.0-31-generic 6.8.0-31.31
  ProcVersionSignature: Ubuntu 6.8.0-31.31-generic 6.8.1
  Uname: Linux 6.8.0-31-generic x86_64
  NonfreeKernelModules: zfs
  ApportVersion: 2.28.1-0ubuntu2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/seq:        aieri      4787 F.... pipewire
   /dev/snd/controlC0:  aieri      4793 F.... wireplumber
   /dev/snd/controlC1:  aieri      4793 F.... wireplumber
  CasperMD5CheckResult: unknown
  CurrentDesktop: ubuntu:GNOME
  Date: Tue May  7 08:54:34 2024
  MachineType: LENOVO 21K9001NUS
  ProcFB: 0 amdgpudrmfb
  ProcKernelCmdLine: root=zfs:zroot/ROOT/ubuntu quiet loglevel=4 
rtc_cmos.use_acpi_alarm=1 spl.spl_hostid=0x4605c990
  RelatedPackageVersions:
   linux-restricted-modules-6.8.0-31-generic N/A
   linux-backports-modules-6.8.0-31-generic  N/A
   linux-firmware                            20240318.git3b128b60-0ubuntu2
  SourcePackage: linux
  UpgradeStatus: Upgraded to noble on 2024-04-14 (22 days ago)
  dmi.bios.date: 02/20/2024
  dmi.bios.release: 1.35
  dmi.bios.vendor: LENOVO
  dmi.bios.version: R2FET55W (1.35 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 21K9001NUS
  dmi.board.vendor: LENOVO
  dmi.board.version: SDK0T76530 WIN
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: None
  dmi.ec.firmware.release: 1.16
  dmi.modalias: 
dmi:bvnLENOVO:bvrR2FET55W(1.35):bd02/20/2024:br1.35:efr1.16:svnLENOVO:pn21K9001NUS:pvrThinkPadP16sGen2:rvnLENOVO:rn21K9001NUS:rvrSDK0T76530WIN:cvnLENOVO:ct10:cvrNone:skuLENOVO_MT_21K9_BU_Think_FM_ThinkPadP16sGen2:
  dmi.product.family: ThinkPad P16s Gen 2
  dmi.product.name: 21K9001NUS
  dmi.product.sku: LENOVO_MT_21K9_BU_Think_FM_ThinkPad P16s Gen 2
  dmi.product.version: ThinkPad P16s Gen 2
  dmi.sys.vendor: LENOVO

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