Thank you for the response!

I ran memtest from the GRUB boot menu and let it run for 3 passes - it
reported no errors.

Next I booted into an Ubuntu 24.04 live ISO and to my surprise the
desktop environment hung after login, just the same as on my live
system!

I flashed an Ubuntu 22.04 live ISO and had the same result when booting
into it. This is perhaps unsurprising as it looks like the newer 22.04
ISOs are using kernel 6.8.0-40, as I saw when inspecting the bundled
vmlinuz image in the one I flashed. I could, however, edit the GRUB
command-line on live ISO boot and switch to single-user mode, which was
functional.

>From there, I ran "short" self-test via smartctl for 1 minute and it
reported no errors. Here are the statistics shown:

Spin_Up_Time 0
Start_Stop_Count 0
Reallocated_Sector_Ct 11
Power_On_Hours 15314
Power_Cycle_Count 907
Unsafe_Shutdown_Count 87
Host_Writes_32MiB 82277
Workld_Media_Wear_Indic 11812
Workld_Host_Reads_Perc 0
Workload_Minutes 3658413212
Available_Reservd_Space 0
Media_Wearout_Indicator 0
End-to-End_Error 0

I also ran fsck on my root ext4 partition on the HDD and it reported
that it was clean.

I did see in the smartctl output that a firmware update from Intel was
recommended, so I flashed and ran the firmware update tool provided at
https://downloadcenter.intel.com/download/26491. This reported that
there were no Intel devices attached though, so I guess that might have
been a false positive.

How would you recommend proceeding? Did I miss some diagnostics on
memtest or smartctl, or do these results indicate that the hardware is
more or less functional? The fact that the system hangs on the new
kernel version even from the live ISO, but does not have any issues with
the old kernel version (even with all other system files the same),
seems to indicate to me that it really is a conflict with the new
kernel, and not a hardware issue or problem with corrupted files. But, I
could be wrong.

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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/2080182

Title:
  System hangs after GDM login with 6.8.0 kernel

Status in linux package in Ubuntu:
  New

Bug description:
  I recently upgraded a working system from Ubuntu 22.04 to 24.04. After
  the upgrade, the system has acquired an eagerness to become completely
  nonresponsive about a minute after logging in to a graphical session.
  Logging in via console/SSH does not trigger hangs as quickly but they
  still occur within a few hours typically. When logging in to a
  graphical session, I notice immediately that performance and
  responsiveness is heavily degraded, and within moments, the entire
  system locks up. Any existing SSH sessions immediately stop
  responding, and the display freezes on whatever it was previously
  displaying. No keyboard or mouse input has any observable effect on
  the system, and it must be powered off manually.

  The system does not reboot automatically nor does it power off. I
  configured linux-crashdump and triggered a kernel panic to verify that
  dump files can be written successfully. However, they are not written
  on this hang, implying that it is not a kernel crash.

  The new Linux kernel version is 6.8.0-41, while the old kernel
  6.5.0-45 is still installed. When booting into the older kernel
  version (no other changes), these symptoms do not occur and function
  is as it was before the 24.04 upgrade.

  Seeing LP#2073358, I tested linux-oem-6.8/6.8.0-1011.11 but this has
  the same behavior as 6.8.0-41-generic.

  ProblemType: Bug
  DistroRelease: Ubuntu 24.04
  Package: linux-image-6.8.0-41-generic 6.8.0-41.41
  ProcVersionSignature: Ubuntu 6.5.0-45.45~22.04.1-generic 6.5.13
  Uname: Linux 6.5.0-45-generic x86_64
  ApportVersion: 2.28.1-0ubuntu3.1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  raxod502   1884 F.... wireplumber
   /dev/snd/seq:        raxod502   1880 F.... pipewire
  CRDA: N/A
  CasperMD5CheckResult: pass
  Date: Mon Sep  9 17:51:02 2024
  InstallationDate: Installed on 2022-10-28 (683 days ago)
  InstallationMedia: Ubuntu 22.04.1 LTS "Jammy Jellyfish" - Release amd64 
(20220809.1)
  MachineType: LENOVO 3626AL3
  ProcFB: 0 i915drmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-6.5.0-45-generic 
root=/dev/mapper/vgubuntu-root ro quiet splash 
crashkernel=2G-4G:1024M,4G-32G:1024M,32G-64G:1024M,64G-128G:2048M,128G-:4096M 
vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-6.5.0-45-generic N/A
   linux-backports-modules-6.5.0-45-generic  N/A
   linux-firmware                            20240318.git3b128b60-0ubuntu2.2
  SourcePackage: linux
  UpgradeStatus: Upgraded to noble on 2024-09-03 (7 days ago)
  dmi.bios.date: 10/11/2012
  dmi.bios.release: 1.64
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 6QET70WW (1.40 )
  dmi.board.name: 3626AL3
  dmi.board.vendor: LENOVO
  dmi.board.version: Not Available
  dmi.chassis.asset.tag: 20124051
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Not Available
  dmi.ec.firmware.release: 1.21
  dmi.modalias: 
dmi:bvnLENOVO:bvr6QET70WW(1.40):bd10/11/2012:br1.64:efr1.21:svnLENOVO:pn3626AL3:pvrThinkPadX201:rvnLENOVO:rn3626AL3:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:sku:
  dmi.product.family: ThinkPad X201
  dmi.product.name: 3626AL3
  dmi.product.version: ThinkPad X201
  dmi.sys.vendor: LENOVO
  mtime.conffile..etc.init.d.apport: 2024-07-22T07:59:07

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