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[Andreas Jellinghaus <aj@xxxxxxxxxxxxxxx>]

same problem here: kubuntu karmic with 2.6.31-15 and nvidia 185 (current packages).
going back to 2.6.31-14 kernel solved the problem for me.

I debugged the issue with strace: kdm doesn't crash, nor does the xserver. the problem
is that X does open("/dev/nvidia0") and that takes about 15 seconds for some reason.
kdm then thinks "starting X server takes too long, something must be wrong" and terminates
the X server (and tries to start a failsafe one).

when you look at the laptop screen (my case: lenovo T61 with nvs 140 quadro chip), the
screen goes black when X is started, and it takes maybe 10 seconds till the nvidia logo
appears. normaly the nvidia logo appears within a few seconds.

in syslog you can see these messages:
Nov 30 15:32:12 yomigaeri kdm[6476]: X server startup timeout, terminating
Nov 30 15:32:15 yomigaeri kdm[6476]: X server died during startup
Nov 30 15:32:15 yomigaeri kdm[6476]: Failed to start X server. Starting failsafe X server.

so you know kdm stopped X server because it took too long to start. in my case X was started
15:31:56, and in strace there was a gap from :57 to :10 or so when open("/dev/nvidia0") was done.

the kernel/dmesg doesn't have any error message from nvidia driver or
similar.

-- 
kdm fails to start/restart (but gdm does properly) in kubuntu karmic 64 bits and nvidia driver 185
https://bugs.launchpad.net/bugs/477066
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