MNLipp (or anyone else seeing a problem), can you confirm exactly what
you saw when you did the case shown in the log?

The log shows that:
1. X server :0 was started on VT7
2. A greeter was started on :0
3. You logged in as mnl
4. The greeter on :0 stopped
5. mnl's session was run on :0
6. You switched to a greeter
7. X server :1 was started on VT8
8. A greeter was started on :1
9. You logged in as anl
10. The greeter on :1 stopped
11. anl's session was run on :1
12. anl logged out
13. X server :1 stopped
14. A new X server :1 started on VT8 (reusing the old name of :1)
15. A greeter was started on :1

So, from 1-6 you should have seen one X server running (:0) and from 7
onwards you should have seen two.

Visually what you should have seen is:
A. A greeter screen
(authenticate as mnl)
B. mnl's session
(switch user)
C. A greeter screen
(authenticate as anl)
D. anl's session
(logout)
E. A greeter screen

I added more regression tests for this, and wasn't able to detect any
left over X server processes on the 1.2 and 1.4 branches or trunk.

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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to lightdm in Ubuntu.
https://bugs.launchpad.net/bugs/1005813

Title:
  Lightdm doesn't terminate alternate session login

Status in Light Display Manager:
  Incomplete
Status in “lightdm” package in Ubuntu:
  Incomplete

Bug description:
  Choosing "Switch to different user" in Ubuntu gives you another login
  screen, which is very nice and useful. However after using that
  alternate session, lightdm keeps the X server and greeter for that
  alternate session open and running. Gdm, on the contrary, terminates
  the X server for the alternate session when you log out of it.

  This behaviour does make a difference when you run Ubuntu on a laptop
  on battery. Using the alternate login just once after boot (and ending
  the session again) initiates a constant cpu load of 1-2% (on my
  laptop). Doesn't sound much. But compared to "idle" without the second
  X server and greeter, this is an increase of about 75%.

  I admit that I didn't have the time to keep the laptop running idlely
  und doing some real battery measurements. But with a laptop on
  battery, you should use any possibility to save energy.

To manage notifications about this bug go to:
https://bugs.launchpad.net/lightdm/+bug/1005813/+subscriptions

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