I'm the original poster of this thread,
don't mean to whip a dead horse, but this
post is to confirm the state of this
issue.
The most recent -current release before
this post has fixed this issue for me.
OpenBSD 6.6-current (GENERIC.MP) #573: Sat Dec 28 19:13:57 MST 2019
[email protected]:/usr/src/sys/arch/amd64/compile/GENERIC.MP
I'm longer greeted with
the given train of messages from
kernel.
>wsmouse0 at ums0 mux 0
>wsmouse0 detached
>ums0 detached
>uhidev2 detached
>uhidev2 at uhub5 port 2 configuration 1 interface 0 "Logitech USB Optical
>Mouse" rev 2.00/72.00 addr 3
>uhidev2: iclass 3/1
>ums0 at uhidev2: 3 buttons, Z dir
Major props to the OpenBSD Devs for
dealing with this successfully and
in such a short time.