F16 - random shutdown delays - systemd related ?

[JB]

Hi,

I experience random shutdown delays of ca. 2 min (testing F16 RC1 thru
RC4, hd installation with LXDE).

To debug it I removed "quiet" and added "systemd.log_level=debug" in
/etc/defaults/grub (kernel boot params).

This are the only messages logged since shutdown command (regardless
whether delay occurred or not):
/var/log/messages:
...
Nov  2 11:16:24 localhost dbus[852]: [system] Activating service
name='org.freedesktop.UPower' (using servicehelper)
Nov  2 11:16:24 localhost dbus-daemon[852]: dbus[852]: [system]
Activating service name='org.freedesktop.UPower' (using servicehelper)
Nov  2 11:16:24 localhost dbus[852]: [system] Successfully activated
service 'org.freedesktop.UPower'
Nov  2 11:16:24 localhost dbus-daemon[852]: dbus[852]: [system]
Successfully activated service 'org.freedesktop.UPower'
Nov  2 11:16:30 localhost kernel: Kernel logging (proc) stopped.
Nov  2 11:16:30 localhost rsyslogd: [origin software="rsyslogd"
swVersion="5.8.5" x-pid="873" x-info="http://www.rsyslog.com"] exiting
on signal 15.

What else can I look at or debug and how ?

I eliminated a possible case of "too quick to shutdown after bootup or after
using firefox and terminal" scenario.

I am wondering if there is something similar to 'systemd-analyze blame'
that would apply to shutdown/reboot (instead of boot-up) time ?
Also with 'systemd-analyze plot' capability ?

JB