port-amd64/56505: amdzentemp0: autoconfiguration error: unable to register with sysmon (error=22)

[jspath55%gmail.com@localhost]

>Number:         56505
>Category:       port-amd64
>Synopsis:       amdzentemp0: autoconfiguration error: unable to register with sysmon (error=22)
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    port-amd64-maintainer
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Wed Nov 17 16:50:00 +0000 2021
>Originator:     Jim Spath
>Release:        NetBSD 9.2
>Organization:
n/a
>Environment:
NetBSD machine.domain 9.2 NetBSD 9.2 (GENERIC) #0: Wed May 12 13:15:55 UTC 2021  mkrepro%mkrepro.NetBSD.org@localhost:/usr/src/sys/arch/amd64/compile/GENERIC amd64
>Description:
I have a new ASUS motherboard with a AMD Ryzen 5 5600X 6-Core Processor.
Was looking for environmental sensors such as CPU temperature, and see these messages in dmesg:

[     1.002665] amdsmn0 at pci0 dev 0 function 0: AMD System Management Network
[     1.002665] amdzentemp0 at amdsmn0: AMD CPU Temperature Sensors (Family19h)
[     1.002665] amdzentemp0: autoconfiguration error: unable to register with sysmon (error=22)
 
The envstat command returns no drivers:

$ envstat
envstat: no drivers registered

>How-To-Repeat:
Happens on boot.
>Fix:
Unknown.