Here the lightdm.log aswell.
[root@ipa-client ~]# tailf /var/log/lightdm/lightdm.log
[+236440.19s] DEBUG: Session pid=39337: Logging to /var/log/lightdm/seat0-greeter.log
[+236440.20s] DEBUG: Activating VT 1
[+236440.20s] DEBUG: Activating login1 session c4
[+236440.20s] DEBUG: Seat seat0 changes active session to c4
[+236440.20s] DEBUG: Session c4 is already active
[+236440.28s] DEBUG: Greeter connected version=1.25.0 api=1 resettable=false
[+236440.54s] DEBUG: Greeter start authentication
[+236440.54s] DEBUG: Session pid=39360: Started with service 'lightdm', username
'(null)'
[+236440.54s] DEBUG: Session pid=39360: Got 1 message(s) from PAM
[+236440.54s] DEBUG: Prompt greeter with 1 message(s)
[+255435.94s] DEBUG: Greeter start authentication for user(a)domain.ad
[+255435.94s] DEBUG: Session pid=39360: Sending SIGTERM
[+255435.94s] DEBUG: Session pid=42280: Started with service 'lightdm', username
'user(a)domain.ad'
[+255435.94s] DEBUG: Session pid=39360: Terminated with signal 15
[+255435.94s] DEBUG: Session: Failed during authentication
[+255435.94s] DEBUG: Seat seat0: Session stopped
[+255436.23s] DEBUG: Session pid=42280: Got 1 message(s) from PAM
[+255436.23s] DEBUG: Prompt greeter with 1 message(s)
[+255442.92s] DEBUG: Continue authentication
[+255443.09s] DEBUG: Session pid=42280: Authentication complete with return value 0:
Success
[+255443.09s] DEBUG: Authenticate result for user user(a)domain.ad: Success
[+255443.09s] DEBUG: User user(a)domain.ad authorized
[+255443.09s] DEBUG: Greeter sets language en_US.utf8
[+255443.09s] DEBUG: Greeter requests session gnome
[+255443.09s] DEBUG: Seat seat0: Stopping greeter; display server will be re-used for user
session
[+255443.09s] DEBUG: Terminating login1 session c4
[+255443.09s] DEBUG: Session pid=39337: Sending SIGTERM
[+255443.10s] DEBUG: Greeter closed communication channel
[+255443.10s] DEBUG: Session pid=39337: Exited with return value 1
[+255443.10s] DEBUG: Seat seat0: Session stopped
[+255443.10s] DEBUG: Seat seat0: Greeter stopped, running session
[+255443.10s] DEBUG: Registering session with bus path
/org/freedesktop/DisplayManager/Session3
[+255443.10s] DEBUG: Session pid=42280: Running command /etc/X11/xinit/Xsession
gnome-session
[+255443.10s] DEBUG: Creating shared data directory /var/lib/lightdm-data/user(a)domain.ad
[+255443.10s] WARNING: Could not chown user data directory
/var/lib/lightdm-data/user(a)domain.ad: Error creating directory
/var/lib/lightdm-data/user(a)domain.ad: File exists
[+255443.10s] DEBUG: Session pid=42280: Logging to .xsession-errors
[+255443.12s] DEBUG: Activating VT 1
[+255443.12s] DEBUG: Activating login1 session 505
[+255443.12s] DEBUG: Seat seat0 changes active session to 505
[+255443.12s] DEBUG: Session 505 is already active
[+255443.30s] DEBUG: Session pid=42280: Exited with return value 1
[+255443.30s] DEBUG: Seat seat0: Session stopped
[+255443.30s] DEBUG: Seat seat0: Stopping display server, no sessions require it
[+255443.30s] DEBUG: Sending signal 15 to process 39329
[+255443.36s] DEBUG: Process 39329 exited with return value 0
[+255443.36s] DEBUG: XServer 0: X server stopped
[+255443.36s] DEBUG: Releasing VT 1
[+255443.36s] DEBUG: XServer 0: Removing X server authority /var/run/lightdm/root/:0
[+255443.36s] DEBUG: Seat seat0: Display server stopped
[+255443.36s] DEBUG: Seat seat0: Active display server stopped, starting greeter
[+255443.36s] DEBUG: Seat seat0: Creating greeter session
[+255443.36s] DEBUG: Seat seat0: Creating display server of type x
[+255443.36s] DEBUG: Using VT 1
[+255443.36s] DEBUG: Seat seat0: Starting local X display on VT 1
[+255443.36s] DEBUG: XServer 0: Logging to /var/log/lightdm/x-0.log
[+255443.36s] DEBUG: XServer 0: Writing X server authority to /var/run/lightdm/root/:0
[+255443.36s] DEBUG: XServer 0: Launching X Server
[+255443.36s] DEBUG: Launching process 42327: /usr/bin/X -core -noreset :0 -seat seat0
-auth /var/run/lightdm/root/:0 -nolisten tcp vt1 -novtswitch -background none
[+255443.36s] DEBUG: XServer 0: Waiting for ready signal from X server :0
[+255443.57s] DEBUG: Got signal 10 from process 42327
[+255443.57s] DEBUG: XServer 0: Got signal from X server :0
[+255443.57s] DEBUG: XServer 0: Connecting to XServer :0
[+255443.57s] DEBUG: Seat seat0: Display server ready, starting session authentication
[+255443.57s] DEBUG: Session pid=42335: Started with service 'lightdm-greeter',
username 'lightdm'
[+255443.58s] DEBUG: Session pid=42335: Authentication complete with return value 0:
Success
[+255443.58s] DEBUG: Seat seat0: Session authenticated, running command
[+255443.58s] DEBUG: Session pid=42335: Running command /usr/sbin/lightdm-gtk-greeter
[+255443.58s] DEBUG: Creating shared data directory /var/lib/lightdm-data/lightdm
[+255443.58s] WARNING: Could not chown user data directory /var/lib/lightdm-data/lightdm:
Error creating directory /var/lib/lightdm-data/lightdm: File exists
[+255443.58s] DEBUG: Session pid=42335: Logging to /var/log/lightdm/seat0-greeter.log
[+255443.59s] DEBUG: Activating VT 1
[+255443.59s] DEBUG: Activating login1 session c5
[+255443.60s] DEBUG: Seat seat0 changes active session to c5
[+255443.60s] DEBUG: Session c5 is already active
[+255443.66s] DEBUG: Greeter connected version=1.25.0 api=1 resettable=false
[+255443.89s] DEBUG: Greeter start authentication
[+255443.89s] DEBUG: Session pid=42358: Started with service 'lightdm', username
'(null)'
[+255443.90s] DEBUG: Session pid=42358: Got 1 message(s) from PAM
[+255443.90s] DEBUG: Prompt greeter with 1 message(s)