No amdtemp sysctls, AMD Ryzen 5 3600X

[Mark Martinec]

Running 12.1-RELEASE-p1 on AMD Ryzen 5 3600X cpu,
but I don't see any temperatures reported in sysctl,
even though amdtemp.ko and amdsmn.ko are loaded
and they don't produce any complaints on loading.

   $ kldstat | fgrep amd
   27    1 0xffffffff82f30000     1458 amdtemp.ko
   28    1 0xffffffff82f32000      808 amdsmn.ko

   $ sysctl -a | grep -i tempe
   $

   $ sysctl dev.amdtemp
   sysctl: unknown oid 'dev.amdtemp'
   $

Nov 13 12:07:27 xxx kernel: CPU: AMD Ryzen 5 3600X 6-Core Processor 
(4100.09-MHz K8-class CPU)
Nov 13 12:07:27 xxx kernel:   Origin="AuthenticAMD"  Id=0x870f10  
Family=0x17  Model=0x71  Stepping=0


Motherboard is an ASUS with X570 chipset, latest BIOS.
No obvious errors are reported during booting.

Any additional information that I can provide?
Any suggestions?

   Mark