[Bug 234676] Boot hangs after upgrade to 12.0-RELEASE (acpi?)

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=234676

--- Comment #6 from johan van Zanten <johanvz816 at giantfoo.org> ---
I've been doing a little more debugging, per
https://docs.freebsd.org/doc/5.5-RELEASE/usr/share/doc/handbook/acpi-debug.html

As i can still booting from the 11.2 kernel i was previously running, i've
collected ASL with "acpidump -t -d" . I get this in stderr  when running it:
acpidump: RSDT entry 3 (sig OEMB) is corrupt

I will attached the acpidump output in case it's useful; there are two errors
in it:

acpi-dump-kern11.2_userland12.0-prodhoun-20190119.asl   5307:                  
          PLD_Revision           = 0x1,
Error    6105 -                                               Invalid object
type for reserved name ^  (_PLD: found Buffer, Package required)

acpi-dump-kern11.2_userland12.0-prodhoun-20190119.asl   5475:                  
          PLD_Revision           = 0x1,
Error    6105 -                                               Invalid object
type for reserved name ^  (_PLD: found Buffer, Package required)

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