Public bug reported:

Hello,

I'm having a problem with the X locking up/showing a black screen. This
started in edge eft (ubuntu 6.10). Here is the repro sequence

1) Create 2 accounts 1 user account and 1 admin account
2) start ubuntu
3) at the login screen log on to the user account with limited privs
4) Then using the ui Applications->System Tools -> New login (basically invoke 
new login)
5) login as the admin user
6) switch to the user account using ctrl+alt+f7 (you'll be prompted to enter 
the password since the screen gets locked)
7) play a movie or perform some other operation in the user account.
8) while the movie is playing switch back to the admin account using 
ctrl+alt+f8 or ctrl+alt+f9.
9) repeat steps 6 to 8, you'll see that eventually ctrl+alt+f8 and ctrl+alt+f9 
will show a black screen for both the user and the admin accounts or the entire 
OS will freeze.

Note this seemed to have started in 6.10 and is still a problem, even in
7.04

** Affects: ubuntu
     Importance: Undecided
         Status: New

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black screen/X locking up after using ctrl+alt+f1 and then ctrl+alt+f7
https://bugs.launchpad.net/bugs/164807
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