[Bug 244083] amdtemp(4) says CPU/cores temp is near freezing on releng/12

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=244083

            Bug ID: 244083
           Summary: amdtemp(4) says CPU/cores temp is near freezing on
                    releng/12
           Product: Base System
           Version: 12.1-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: portmaster at bsdforge.com

OK I grabbed some spares out of the server closet
to assemble a builder box. The parts included a 4
core AMD X4 CPU.
I also grabbed a hard disk that already had an older
copy of 12-CURRENT installed on it. After booting into
the system, I discovered that FreeBSD said the
temperature of the CPU was ~1.1C! Contrary to the
earlier POSTing into the BIOS which reported a
temperature ~34-38C.
Here's the output from the 5 AMD CPUs I have immediately
available (all running newish to 2day old releng/12):
# grep -F Ath /var/run/dmesg.boot
CPU: AMD Athlon(tm) II X3 440 Processor (3013.96-MHz K8-class CPU)
# sysctl -a | grep tempe
dev.cpu.2.temperature: 31.5C
dev.cpu.1.temperature: 31.5C
dev.cpu.0.temperature: 31.5C

# dmidecode -t4 | grep AMD
Manufacturer: AMD
Version: AMD Athlon(tm) 64 X2 Dual Core Processor 4200+
# sysctl -a | grep tempe
hw.acpi.thermal.tz0.temperature: 32.1C
dev.cpu.1.temperature: 45.0C
dev.cpu.0.temperature: 48.0C

# dmidecode -t4 | grep AMD
Manufacturer: AMD
Version: AMD FX(tm)-6300 Six-Core Processor
# sysctl -a | grep tempe
dev.cpu.5.temperature: 30.1C
dev.cpu.4.temperature: 30.1C
dev.cpu.3.temperature: 30.1C
dev.cpu.2.temperature: 30.1C
dev.cpu.1.temperature: 30.1C
dev.cpu.0.temperature: 30.1C

# dmidecode -t4 | grep AMD
Manufacturer: AMD
Version: AMD Athlon(tm) II X4 630 Processor
# sysctl -a | grep tempe
dev.cpu.3.temperature: 33.5C
dev.cpu.2.temperature: 33.5C
dev.cpu.1.temperature: 33.5C
dev.cpu.0.temperature: 33.5C

# # # BROKEN
# dmidecode -t4 | grep AMD
Manufacturer: AuthenticAMD
Version: AMD Athlon(tm) X4 860K Quad Core Processor
# sysctl -a | grep tempe
dev.cpu.3.temperature: 13.1C
dev.cpu.2.temperature: 13.1C
dev.cpu.1.temperature: 13.1C
dev.cpu.0.temperature: 13.1C

NOTE: the last entry which under a normal load (as
the others) only reports 13.1C -- up from 1-7C.

I can easily provide additional info as needed. As
well as peek/poke/test anything necessary.

Thank you for all your time, and consideration.

--Chris

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