I have the same bug as described on my fresh install of Ubuntu 14.04, however 
I'm with a newer kernel because of problems with my wifi drivers in previous 
versions, which were fixed:
Linux
3.17.3-031703-generic 
#201411141335 SMP Fri Nov 14 18:36:40 UTC 
2014 x86_64 x86_64 x86_64 GNU/Linux
Ubuntu 14.04.1 LTS
14.04
trusty

The problem is reproducible multiple times. After closing the laptop lid
and going in suspend for a longer period, when opened the laptop
displays the welcome screen with my wallpaper, but does not have any
field to enter password. Clicking any sound/lang icons on the menu bar
does not help, but waiting for a bit of time does.

Diagnostics so far:
So I dig a bit myself and looked at the log of lightdm, with "the problem" 
occurring here:
[+0.28s] DEBUG: Session pid=1224: Running command 
/usr/lib/lightdm/lightdm-greeter-session /usr/sbin/unity-greeter
[+0.28s] DEBUG: Creating shared data directory /var/lib/lightdm-data/lightdm
[+0.28s] DEBUG: Session pid=1224: Logging to /var/log/lightdm/x-0-greeter.log
[+0.33s] DEBUG: Activating VT 7
[+0.33s] DEBUG: Activating login1 session c1
[+0.45s] DEBUG: Session pid=1224: Greeter connected version=1.10.3
[+0.60s] DEBUG: Session pid=1224: Greeter start authentication for alex
[+0.60s] DEBUG: Session pid=1283: Started with service 'lightdm', username 
'alex'
[+1.67s] DEBUG: Session pid=1283: Got 1 message(s) from PAM
[+1.67s] DEBUG: Session pid=1224: Prompt greeter with 1 message(s)
[+3.49s] DEBUG: Session pid=1283: Authentication complete with return value 0: 
Success

As can be seen the period 0.60-1.67 is just waiting for the PAM service
to respond (1 minute wait). I typed my password asap as it was
available, so my guess is it is connected with the PAM service. I will
look into it, but if someone has an idea why would be great.  The
/var/log/auth.log does not contain any useful information for the why
the problem is occurring.

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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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