Public bug reported:

I am running kubuntu 8.10 updated to kde 4.2 through intrepid-backports
repository packages. I have installed only the screensavers that shipped
with the distribution by default.

 apt-cache policy kscreensaver:
kscreensaver:
  Installed: 4:4.2.0-0ubuntu1~intrepid1
  Candidate: 4:4.2.0-0ubuntu1~intrepid1
  Version table:
 *** 4:4.2.0-0ubuntu1~intrepid1 0
        500 http://ftp.uninett.no intrepid-backports/main Packages
        100 /var/lib/dpkg/status
     4:4.1.4-0ubuntu1~intrepid1 0
        500 http://ftp.uninett.no intrepid-updates/main Packages
     4:4.1.2-0ubuntu2 0
        500 http://ftp.uninett.no intrepid/main Packages

Expected behavior
After a set idle time screensaver should turn on, and after an optional wait 
should lock access to the computer. Access to computer can be re-opened by 
touching mouse or keyboard to bring up a password dialog box. If correct 
password is entered, access is given to the ordinary desktop running as before 
the screensaver turned on.

Actual behavior
When using OpenGL enabled screensavers like, for example, 'flux", the 
screensaver itself displays properly, but after the computer is locked such 
that a password is required to open it again, it is impossible to continue to 
use the computer. 
The dialog box for entering the password and unlocking does not appear. The 
opengl 'flux' display is terminated and the log/in screen shows (not the 
desktop background but the kde splash login) - without any login related stuff 
like a place to enter your password. It just shows the background of the kde 
splash login, not the login dialog.

There appears to be no way out of this lock (not even restart X
CtrlAltBackspace) except the dreaded power button.

** Affects: kdeartwork (Ubuntu)
     Importance: Undecided
         Status: New

-- 
opengl screensavers freeze/lockup on re-entry
https://bugs.launchpad.net/bugs/337157
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