non-X11 keyboard sluggishness on Thinkpad T16

I have just loaded FreeBSD-15.0-CURRENT-amd64 onto a Thinkpad T16.

I experienced significant slowness of response (or sluggishness)
with any native keyboard keypress.  It does allow me to login as
root, but it is a very time consuming process.

Hooking up an external USB keyboard, and everything worked fine.

I have not seen this happen in the past loading FreeBSD onto
a Thinkpad.  I have seached the net for clues, but it seems
most of the hits are problems using Xorg/x11, while this is
a virtual terminal situation -- I have yet to install any
ports, let alone Xorg/x11.

In order to avoid the system hanging during the installation
using a thumbdrive (memstick) I had to "unset" an entry in
/boot/device.hints "hint.uart.1.at".

I don't know which area to focus on: 15.0-CURRENT, the BIOS,
the T16 itself, or something about virtual terminals.

Any ideas or help would be greatly appreciated.  Thanks.

-- 
William Bulley
E-MAIL: web@umich.edu
<web@umich.edu>