[homebrewer]

Make sure this works on your system before you really need it, as some keyboard/USB-controller combinations take a few seconds to wake up from whatever slumber they're in and start working. I ran into this several times.

[NikkiA]

That's likely something related to USB legacy support being on or off.

A lot of modern BIOS/EFI also allow a hybrid setting that enables legacy support until the OS takes over, which can sometimes be better too.