[Bug 40011] Three users switching leads to blank tty9

[mannheim]

Public bug reported:

Affects: gdm (Ubuntu)
       Severity: Normal
       Priority: (none set)
         Status: Unconfirmed


Description:
Using dapper's gdm and the "switch user" funcionality available in the
"log out" dialog, do:

1. Login as user "A".
2. From A's desktop, switch user and login as "B".
3. From B's desktop, switch user and login as "C".
4. From C's desktop switch back to B (resume session).
5. As B, log out (this returns you to "A").
6. From A's desktop switch user to C (resume session).
7. As C, log out.

After step 7, you find yourself at a blank tty9 with a blinking cursor.

Explanation: users A, B and C are on tty7, tty9 and tty10 by default.
When "B" logs out, tty9 becomes blank. When "C" logs out later from
tty10, the screen is retuned to tty9. The logic in gdm needs to be
changed. When "C" logs out, the user should be returned to tty7 in this
situation (or to a new gdm screen).

Please note, this is a bug in the logic of gdm, not a display/video
driver issue. It is 100% reproducible on my machine at least.

-- 
Three users switching leads to blank tty9
https://launchpad.net/bugs/40011