Greetings

I've been using lxdm for my display manager.
Yesterday evening after returning to my machine after supper the display
wouldn't move out of sleep mode and I found this (see next) in
/var/log/lightdm/

[+101478.18s] DEBUG: Got signal 15 from process 1
[+101478.18s] DEBUG: Caught Terminated signal, shutting down
[+101478.18s] DEBUG: Stopping display manager
[+101478.18s] DEBUG: Seat seat0: Stopping
[+101478.18s] DEBUG: Seat seat0: Stopping display server
[+101478.18s] DEBUG: Sending signal 15 to process 12436
[+101478.18s] DEBUG: Seat seat0: Stopping session
[+101478.18s] DEBUG: Terminating login1 session 19
[+101478.18s] DEBUG: Session pid=12517: Sending SIGTERM
[+101478.42s] DEBUG: Session pid=12517: Exited with return value 1
[+101478.42s] DEBUG: Seat seat0: Session stopped
[+101479.03s] DEBUG: Seat seat0 changes active session to
[+101479.43s] DEBUG: Process 12436 exited with return value 0
[+101479.43s] DEBUG: XServer 0: X server stopped
[+101479.43s] DEBUG: Releasing VT 7
[+101479.43s] DEBUG: XServer 0: Removing X server authority
/var/run/lightdm/root/:0
[+101479.43s] DEBUG: Seat seat0: Display server stopped
[+101479.43s] DEBUG: Seat seat0: Stopped
[+101479.43s] DEBUG: Display manager stopped
[+101479.43s] DEBUG: Stopping daemon
[+101479.43s] DEBUG: Exiting with return value 0

I don't like the display manager just 'stopping' !
Is there a more robust display manager?
Anyone hazard a list of best to worst?

(Thinking lxdm, openbox, xdm and there are only about a dozen more.)

I run a multi-gpu multi-monitor (5 monitors in total) system so want
something robust - - - - just don't like these kind of issues.

(Any idea what process 1 might be or how I can find out?)

TIA