Some more details on the PC with the heavy problems: The card is a
GeForce 6100 nForce 430 (according to nvidia-settings). I removed the
above mentioned GDM links, nothing changed. Even more: If I do a warm
boot after logging out from KDE (and having no other choice, since I
have only the black screen as alternative to the remaining text
consoles), I finally end up with Bios beeping and a black screen (beep
code indicates memory error - Award Bios, continuously beeeep, beeep,
beeep... I have to turn off the computer, wait a few seconds, turn it on
again. Then it comes up until after the boot splash - and hangs for
about 20 seconds as described above, before X finally gets started.

I ran nvidia-xconfig again (which changed and re-arranged the
xorg.conf), so I gave it another try. After the logout from KDE the same
situation. This time I grabbed a console and had a look at the log files
- and here's what I found in /var/log/syslog:

 Jul 23 20:15:14 nebo console-kit-daemon[6171]: WARNING: Unable to activate 
console: No such device or address
Jul 23 20:15:14 nebo kernel: [39286.563103] Xorg[6575]: segfault at 00000009 
eip 080c671b esp bff8cce0 error 4
Jul 23 20:15:14 nebo kdm[6570]: X server terminated: [0, 0, 0]
Jul 23 20:15:14 nebo kdm[6570]: X server for display :0 terminated unexpectedly
Jul 23 20:15:14 nebo kdm[6570]: Unable to fire up local display :0; disabling.

looks like the video driver messes things up completely. Driver details
(taken from "dpkg -l nvidia-*)

ii  nvidia-glx                             1:96.43.05+2.6.24.14-20.46           
  NVIDIA binary XFree86 4.x/X.Org driver
un  nvidia-glx-legacy                      <keine>                              
  (keine Beschreibung vorhanden)
un  nvidia-glx-new                         <keine>                              
  (keine Beschreibung vorhanden)
un  nvidia-glx-src                         <keine>                              
  (keine Beschreibung vorhanden)
un  nvidia-kernel-1.0.7184                 <keine>                              
  (keine Beschreibung vorhanden)
un  nvidia-kernel-1.0.7185                 <keine>                              
  (keine Beschreibung vorhanden)
un  nvidia-kernel-1.0.9631                 <keine>                              
  (keine Beschreibung vorhanden)
un  nvidia-kernel-1.0.9639                 <keine>                              
  (keine Beschreibung vorhanden)
un  nvidia-kernel-1.0.9755                 <keine>                              
  (keine Beschreibung vorhanden)
un  nvidia-kernel-100.14.19                <keine>                              
  (keine Beschreibung vorhanden)
un  nvidia-kernel-169.12                   <keine>                              
  (keine Beschreibung vorhanden)
un  nvidia-kernel-71.86.04                 <keine>                              
  (keine Beschreibung vorhanden)
un  nvidia-kernel-96.43.05                 <keine>                              
  (keine Beschreibung vorhanden)
ii  nvidia-kernel-common                   20051028+1ubuntu8                    
  NVIDIA binary kernel module common files
un  nvidia-kernel-source                   <keine>                              
  (keine Beschreibung vorhanden)
ii  nvidia-settings                        1.0+20080304-0ubuntu1.1              
  Tool of configuring the NVIDIA graphics driver
un  nvidia-xconfig                         <keine>                              
  (keine Beschreibung vorhanden)

Hm - I can call nvidia-xconfig - why does it say "un" and not "ii"? That
looks like a real mess - all kind of drivers "unpacked", and even the
nvidia-kernel package with the matching version number is only marked
"un" and not "ii"? If I try to reconfigure it (dpkg --configure nvidia-
kernel-96.43.05), dpkg says it cannot configure the package since it is
not installed?

I got curios, and looked with synaptic - most of the "un" listed
packages are not even shown there! I tried to get thing in order:

dpkg --configure -a
dpkg -C

both showed up nothing. Neither did "apt-get install -f". Please advice
how to clean that mess!

-- 
X crashes on logout - takes long to come up on boot
https://bugs.launchpad.net/bugs/250891
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