When you're at the lock screen, sound keeps playing as it should. And
the microphone and camera keep working as they should. It would be a
pain if a Skype call, for example, was effectively cut off just because
the screen saver momentarily came on.  Any accessibility options you
were using during the session should also be in effect at the lock
screen, because it's your session that you're unlocking, and ignoring
them would be gratuitously annoying. And on Touch, apps like the camera
may be available in a limited way at the lock screen, and when they are,
they should store data for you and not for any other user.

When you're at the login screen, on the other hand, sound output is cut
off as it should be. The microphone and camera should also no longer
receive input. Any accessibility configuration should be system-wide,
because it's not necessarily you who is logging in. And on Touch, apps
that store data can be available only if there is one user account. (In
theory you could select a user and then launch an app before logging in,
but selecting a user already prompts you to log in and may even log you
in automatically, so there's barely any point.)

This makes the greeter fundamentally different from the lock screen in
many non-visual ways. So the answer to your question, Bence, is that
this feature was not completely designed. For a long time it was treated
as merely a visual design problem, without these other issues being
tackled.

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https://bugs.launchpad.net/bugs/878836

Title:
  Unity Greeter - Use Unity Greeter to fulfil lock screen as well as
  login functions

Status in Ayatana Design:
  Fix Committed
Status in The Session Menu:
  Fix Released
Status in Light Display Manager:
  Triaged
Status in “gnome-screensaver” package in Ubuntu:
  Triaged
Status in “indicator-session” package in Ubuntu:
  Fix Released
Status in “lightdm” package in Ubuntu:
  Triaged
Status in “unity-greeter” package in Ubuntu:
  Triaged
Status in “indicator-session” source package in Precise:
  Fix Released

Bug description:
  Use Unity Greeter to fulfil lock screen as well as login functions.

  Desired Solution:
  - Replace the current lock screen with the Unity Greeter
  - perhaps use 'light locker', see 
http://www.webupd8.org/2013/08/lightdm-session-locker-light-locker.html
  - also see https://plus.google.com/u/0/106086509626546157534/posts/5hQVYARYCkh

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