Machine won't power off after upgrade to bullseye.

[Tim Woodall <debianuser@woodall.me.uk>]

I have an old machine that I've just upgraded to bullseye. Now that it's
upgraded it does not power off when I do halt -p.

I see the following error: (copied so hopefully no typos)

Will now halt.
[  183.942475] ACPI BIOS Error (bug): Could not resolve symbol [\_SB.PCI0.LPCB.TPM.PTS], AE_NOT_FOUND (20200925/psargs-330)
[  183.942946] ACPI Error: Aborting method \_PTS due to previous error (AE_NOT_FOUND) (20200925/psparse-529)
[  183.943586] reboot: Power down

I found this old bug:

https://bugzilla.kernel.org/show_bug.cgi?id=199117

While this may well be a bios bug, I've never had this problem before.
Now I've got it on two different (older machines)

I'll try downgrading the kernel back to 4.19 but has anyone else seen
anything like this?

Tim.