using KVM switch /dev/psm0 is missing

[Malcolm Fitzgerald]

I have a no name 2 port KVM switch and a Logitech marble mouse USB with a ps/2 
adapter.

The KVM switch works on port 1 and 2 when it is connected to the windows box.
The mouse works on the ps/2 port when it is connected directly to the BSD box.

When the mouse is connected via the KVM switch the mouse doesn't work and 
there is no psm0 in /dev.

What can I do to discover the mouse and get /dev/psm0 ?

-- 
Malcolm Fitzgerald