[Bug 2059738] Re: Kernel 6.8 - Shutdown/Reboot hangs on Noble 24.04

Seeing this on my T460s as well

Suspend (on lid close) ; the machine reaches the state where the lid
light and the light on the power button "throb" as they would with
22.04, but the machine will not resume from suspend in response to
keyboard events, mouse events, or a brief press to the power button.

Poweroff : the machine reaches a state where everything appears "off",
no lights, no screen activity etc, but the machine does not restart in
response to a brief press of the power button.

In both cases, a long-press of the power button is required. You can
tell this has "taken" when the lights on the hardwire ethernet port
blink briefly on release.

Then a normal brief press will restart the machine.

Both of these conditions happen reliably on lid close (suspend) or
poweroff (from menu or command). Going to test reboot now since this is
mentioned above.

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Title:
Kernel 6.8 - Shutdown/Reboot hangs on Noble 24.04

Status in snapd:
Confirmed
Status in linux package in Ubuntu:
Confirmed
Status in snapd package in Ubuntu:
Confirmed

Bug description:
[Overview]
I have been testing installations of a number of Lubuntu and Xubuntu Noble Numbat 24.04 Daily builds since Feb 2024 on a DELL Wyse 3040 (UEFI bios), more latterly focused on Lubuntu.

It would appear that since introduction of Kernel 6.8 into the daily
builds, the installed system fails to carry out a successful reboot or
power off when commanded from the desktop or the command line

[Symptoms]
When selecting either Leave-->Shutdown or Leave-->Reboot from the control panel, the process starts shutting down processes in an orderly fashion, until it gets to the part where it needs to power off hardware, where it hangs.

shutdown -H now also fails in the same manner
shutdown -r now also fails in the same manner

With quiet bootflag disabled, the last system message on display before the hang is
"Starting reboot..." or "Starting power-off..."

[Workaround]
The power button must be pressed for 5 secs to power down the hardware

[Possibly related bugs]
#1594023 Poweroff or reboot hangs. Laptop won't shutdown. 16.04
#2036987 Laptop Does Not Power Off After Installing Daily Build Of 23.10

[Unsuccessful Workarounds]
Tried boot flags acpi=force acpi=nocrq reboot=pci suggested in #1594023 - No effect

[Observations]
I do believe that shutdown/reboot was working correctly on a live USB Lubuntu Noble Numbat Alpha build on the same hardware downloaded 22-Feb-2024. This release had an earlier kernel than 6.8. Sadly i no longer have the .iso to confirm this.

All Lubuntu Noble daily builds since kernel 6.8 was introduced appear
to exhibit the symptoms as above

[System info]
Operating System: Ubuntu Noble Numbat (development branch)
Kernel: Linux 6.8.0-11-generic
Architecture: x86-64
Hardware Vendor: Dell Inc.
Hardware Model: Wyse 3040 Thin Client
Firmware Version: 1.2.5
Firmware Date: Mon 2018-08-20

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