Fn keys not working in Debian 12 on Lenovo Thinkpad T450s

[Rodolfo Medina <rodolfo.medina@gmail.com>]

As my machine has a dual boot with MS Windows, F2 and F3 keyboard keys work
fine in Windows in lowering and increasing sound volume, and F1 for muting it
etcetera F4, F5, F6..., but in Debian they don't seem to work.

Please help who can, thanks in advance.

Rodolfo