Bug#590626: kdm starts too early

[Rutger ter Borg <rutger@terborg.net>]

Same here, with a NVidia 9600M. When failing, syslog shows

Sep 23 08:58:49 gonzo kdm[1694]: X server startup timeout, terminating
Sep 23 08:58:51 gonzo kdm[1694]: X server for display :0 cannot be 
started, session disabled

whereas X is starting just fine.

Sometimes the machine starts just fast enough, and starts into kdm, and 
sometimes it is not.  This leads to unpredictable behavior.