Comment # 1 on bug 1120391 from Neil Rickert

I'll note that a number of users have reported similar problems in posts at
opensuse forums.

Here is one of those threads:

https://forums.opensuse.org/showthread.php/534256-Unable-to-login-to-text-terminals-System-does-not-let-me-enter-password

In all cases, the problem seems to have started with kernel 
4.12.14-lp150.12.25-default and the subsequent
4.12.14-lp150.12.28-default had the same problem.