On Mon, Jun 02, 2025 at 08:04:22AM +0200, Jan Stary wrote: > In retrospect, why did this USB keyboard ever attach via pckbc?
It didn't. At least, not in the dmesgs that you attached. The pckbc and pckbd drivers are strictly PS/2. The uhidev and ukbd drivers are USB. Both pckbd and ukbd can be used as wskbd devices, I.E. a keyboard that is recognised and used by wscons. Your USB keyboard is using ukbd in both of those dmesgs. It's possible that at some point in the past you might have seen it connect as a pckbc device if your BIOS has some kind of legacy emulation function enabled that simulated a PS/2 device. But I'm not seeing that here.
