[Bug 285867] 14.2-RELEASE kernel hangs on Thinkpad T400

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=285867

--- Comment #9 from Tomoaki AOKI <junchoon@dec.sakura.ne.jp> ---
Not sure about T400, but smells ACPI problems in UEFI firmware / BIOS.
If I recall correctly, currently FreeBSD depends on ACPI to detect CPU spec
including (S)MP topology.

And maybe unlikely, but if your firmware / BIOS allows selecting MPS (Multi
Processor Spec.) version, changing it to something others (usually 1.1 and 1.4
but possibly something more) could resolve the issue (quite old experience on
other OS, if I recall correctly).

Lastly, if you've not done, what happenes if you add
acpi_ibm_load="YES"
in your /boot/loader.conf and reboot? Any differences?

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