I'm afraid I have to veto this. It's way too premature to land this in
precise.

On the proprietary graphics drivers, VT switching is inherently unstable
and causes lots of flickering due to them not doing KMS. Also, starting
multiple user sessions at once (which is what this comes down to) has
never really worked reliably on NVidia, and it's just plain broken on
many (most?) machines. So far people have learned to not do user
switching, but log out and back in. This forces the bug upon every
NVidia user now, so as soon as the screen saver kicks in, you probably
just have to reboot, losing all your session state.

On systems with multiple monitors (all drivers) the current packages do
not maintain the XRandR configuration from the user session, but switch
back to the X.org defaults. This causes a lot of flickering, destroys
the monitor configuration (wrong resolution, re-enabling monitors you
previously disabled, etc.), and thus looks quite hideous and also is
very slow. Most monitors I've seen take a few seconds to get back to
their senses after an xrandr switch, and our Samsung 24" takes about 20
seconds.

Please revert this. I'm afraid it still needs a lot of groundwork on
both drivers and the XRandR handling before we can land this :-(

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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

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