Comment # 4 on bug 953035 from Florian Hirschhuber

https://forums.opensuse.org/showthread.php/510632-Can-t-use-keyboard-to-type-in-LVM-crypt-password

As stated here also in the forums I have exactly the same problem.

I can not enter my LUKS password during boot process.
I have an Logitech K800 Keyboard. The only way to type in your password is to
use an old PS2 Keyboard otherwise you are locked out of your system.