I tried to configure PAM automount to auto-mount Samba shares on user login in KDM. However, KDM does not seem to invoke PAM in a way that the auto-mounts are triggered.

What I did:

I added two cifs devices to /etc/security/pam_mount.conf.xml:
<pam_mount>
       <debug enable="0" />
       <volume uid="1000-10000" pgroup="examplegroup" fstype="cifs" server="exampleserver" path="homes" mountpoint="/exampleserver/%(USER)" />
       <volume uid="1000-10000" pgroup="examplegroup" fstype="cifs" server="exampleserver" path="credativ" mountpoint="/home/examplecommonuser" />
       <mntoptions deny="*" />
       <path>/sbin:/bin:/usr/sbin:/usr/bin:/usr/local/sbin:/usr/local/bin</path>
       <logout wait="1" hup="1" term="1" kill="1" />
       <mkmountpoint enable="1" remove="0" />

</pam_mount>

I checked the PAM settings for KDM, but they seem fine:
$ cat /etc/pam.d/kdm
#
# /etc/pam.d/kdm - specify the PAM behaviour of kdm
#
auth       required     pam_nologin.so
auth       required     pam_env.so readenv=1
auth       required     pam_env.so readenv=1 envfile=/etc/default/locale
@include common-auth
@include common-account
session    required     pam_limits.so
@include common-session
@include common-password

The mount option is supplied in common-auth and common-session:
$ grep mount /etc/pam.d/*
/etc/pam.d/common-auth:auth    optional        pam_mount.so
/etc/pam.d/common-session:session       optional        pam_mount.so

This setup works with other login managers - but not with KDM.

Reproducible: Always

Steps to Reproduce:
1. Enter a PAM automount configuration to PAM common-auth, common-session and /etc/security/pam_mount.conf.xml .
2. Reboot machine, log into user.
3. See that the cifs paths are not mounted.
Actual Results:  
The cifs paths are not mounted.

Expected Results:  
The paths should be mounted automatically.

When I fire up konsole and log in myself again in the running session (su - $USER) I am asked for the PAM mount password on the shell. Actually I do exactly that to workaround the problem right now.