no kdm after 2.2->2.4

[Joe Mc Cool <joe@benburb.demon.co.uk>]

Please, if this is a FAQ, my google searches can't find it.

I have just just upgraded from woody to sarge, no problem.

But when I upgrade from the 2.2.20 kernel to 2.4.27-2-686, kdm will not 
start.

In /var/log/syslog I get error messages like:

Jun 27 17:47:24 solaris kdm: :0[610]: Hung in XOpenDisplay(:0), aborting
Jun 27 17:47:24 solaris kdm: :0[610]: Cannot connect to :0, giving up
Jun 27 17:47:24 solaris kdm[585]: Display :0 cannot be opened
Jun 27 18:29:39 solaris kdm: :0[13997]: Hung in XOpenDisplay(:0), aborting
Jun 27 18:29:39 solaris kdm: :0[13997]: Cannot connect to :0, giving up
Jun 27 18:29:39 solaris kdm[13977]: Display :0 cannot be opened
Jun 27 19:41:18 solaris kdm: :0[548]: Hung in XOpenDisplay(:0), aborting
Jun 27 19:41:18 solaris kdm: :0[548]: Cannot connect to :0, giving up
Jun 27 19:41:18 solaris kdm[533]: Display :0 cannot be opened
Jun 27 19:50:48 solaris kdm_greet[2174]: Can't open default user face
Jun 27 21:35:15 solaris kdm[533]: X server for display :0 terminated 
unexpectedly
Jun 27 21:40:08 solaris kdm: :0[615]: Hung in XOpenDisplay(:0), aborting
Jun 27 21:40:08 solaris kdm: :0[615]: Cannot connect to :0, giving up
Jun 27 21:40:08 solaris kdm[589]: Display :0 cannot be opened

I can run X ok and startkde, but I need kdm to provide user logins a la kde.

With kernel 2.2.20 everything runs fine.

Thanks

Joe