> But a password field should always be shown by the unlock screen,
regardless of the authentication backend.

No.

For example, if smart card authentication is in use, the PIN entry field
should not be shown until and unless the smart card is inserted in the
reader.

If challenge-response authentication is in use, it would incorrect to
display the response field until the user ID has been entered and a
challenge presented.

There are a number of scenarios in which it is just wrong to present a
password field.  It is correct for the Unity lock screen to not always
displaying a password entry field when it has not been instructed to do
so by the underlying auth mech.  Any authentication dialog that does so,
and actually authenticates the user as a result, possibly has a critical
security vulnerability.

It would be a good idea to audit your local authentication setup if you
are seeing this bug.

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https://bugs.launchpad.net/bugs/1311316

Title:
  After locking screen there is no input field to type password for
  unlock

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