Comment 8 for bug 1069183

Thanks for all the detailed logs.
There's definitely something weird going on.

Between auth complete and login the following happens:
  - There's an animation
  - We take a snapshot of the screen, and run an app to set the X root background image
  - We start the session

The delay is almost certainly something going wrong in this second stage. It's a bit of a hack that all display managers do to solve a black flicker between login and ksplash starting.

I don't see how the choice of background could make a difference as it's sending a screenshot of the screen to lightdm-kde-greeter-rootimage, I don't see how what's in the image could make a difference.

Could you set the background image again, and see if it's reproducible?
Do you get the delay with a different background file?