Some time ago new ACPI messages appeared on console and in /var/log/messages. 
Like these:

ACPI Error: Needed type [Reference], found [Processor] 0xfffff800043b8980 
ACPI Exception: AE_AML_OPERAND_TYPE, While resolving operands for [OpcodeName 
unavailable] (20161117/dswexec-498)
ACPI Error: Method parse/execution failed [\134_SB.PCI0.LPCB.EC0.PPNT] (Node 
0xfffff80004396640), AE_AML_OPERAND_TYPE (20161117/psparse-560)
ACPI Error: Method parse/execution failed [\134_SB.PCI0.LPCB.EC0._Q04] (Node 
0xfffff80004396c40), AE_AML_OPERAND_TYPE (20161117/psparse-560)
acpi_ec0: evaluation of query method _Q04 failed: AE_AML_OPERAND_TYPE

I'm sure that there were no such messages earlier. Suspend/resume works
for me. But after disconnecting power line hw.acpi.acline still equals
to 1. And powerd/powerdxx do not adjust CPU frequency anymore.

System info:
$ uname -a
FreeBSD vzakharov 12.0-CURRENT FreeBSD 12.0-CURRENT #14 r310326M: Tue Dec 20 
16:42:21 MSK 2016 root@vzakharov:/home/obj/usr/src/sys/GENERIC-NODEBUG  amd64

dmesg: http://pastebin.com/cYD8cR0b
hw.acpi: http://pastebin.com/Tht9B0FZ
acpidump: http://vzakharov.ru/z2v-HPProBook430G2.asl

PS. I'm not subscribed to freebsd-acpi. So keep me in CC, please.

Regards,                 | "In theory there is no difference between theory
  Vladimir Zakharov      | and practice. In practice there is."- Yogi Berra
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