Hi,
There was a post back in July 2020 about alphanumeric keys not being recognised by a Windows 10 PC and the user being unable to enter their password. The response to use the on-screen keyboard allowed access back to the PC.
I am having the same problem occurring intermittently - sometimes at login, or in the middle of using the laptop. No indication as to why. The enter, cursor, delete, backspace keys etc work - just not the alphanumeric keys. Restart does not cure it. Device manager does not indicate any issues with the keyboard or its drivers which are most up to date. Plugging in an external USB keyboard does not seem to work (first time it seemed to alllow typing on the external as well as laptop keyboard) but on subsequent occasions when the error has occurred, plugging in the USB keyboard has not fixed the issue. Eventually, it spontaneously resolves (well so far it has - although a variable length of time - occasionally the next day eventually).
Whilst the on-screen keyboard can get you out of trouble, it is clearly not a solution in the way that even an external or wireless keyboard might be.
Any help would be much appreciated.
Thanks