Comment 32 for bug 1311403

This is still present in 15.04.

i.e. the password dialogue box is present on the lock screen but keyboard input results in no dots appearing. It is not just a case of "no dots" being displayed because typing the full password and pressing return has no effect.

This is listed as a possible duplicate of bug #1311316 but this may not be the case as that bug seems concerned with the lack of password box being displayed and maybe dual monitors.

NOTE
In my case, if an onscreen touch keyboard is used, a password can be entered suggesting an issue with reactivating the keyboard following resume.