ラズパイ２　watchdogタイマー後の自動ログインがうまくいかない

前提・実現したいこと

ラズパイ2にてwatchdogタイマーが働いた後に、ラズパイをリセットさせて
再起動後に自動ログインしてGUIのプログラムを起動させたい

発生している問題・エラーメッセージ

テストでwatchdogタイマーを働かせるためにフォーク爆弾（:(){ :|:&};:）で
ラズパイがリセットする事は確認しましたが、
再起動後に必ず自動ログイン(piユーザー)出来ない。自動ログインしたりパスワードを求められたりする。
どなたか、watchdogタイマー後に必ず自動ログイン出来る方法を教えてください。

試したこと

〇watchdogタイマーの設定
/boot/config.txt　に
dtparam=watchdog=on　を追加

/etc/modprobe.d/bcm2709-wdt.conf　のファイルを作成後、次の１行を記入
options bcm2709_wdt heartbeat=30 nowayout=0

/etc/systemd/system.conf　のファイルを
RuntimeWatchdogSec=30　に設定

〇ラズパイ設定
/etc/systemd/system/getty.target.wants/getty@tty1.service を編集
ExecStart=-/sbin/agetty --autologin pi --noclear %I $TERM

/etc/lightdm/lightdm.confファイルを
autologin-user=pi
autologin-user-timeout=0

p
1〇getty@.serviceファイル
2#  SPDX-License-Identifier: LGPL-2.1+
3#
4#  This file is part of systemd.
5#
6#  systemd is free software; you can redistribute it and/or modify it
7#  under the terms of the GNU Lesser General Public License as published by
8#  the Free Software Foundation; either version 2.1 of the License, or
9#  (at your option) any later version.
10
11[Unit]
12Description=Getty on %I
13Documentation=man:agetty(8) man:systemd-getty-generator(8)
14Documentation=http://0pointer.de/blog/projects/serial-console.html
15After=systemd-user-sessions.service plymouth-quit-wait.service getty-pre.target
16After=rc-local.service
17
18# If additional gettys are spawned during boot then we should make
19# sure that this is synchronized before getty.target, even though
20# getty.target didn't actually pull it in.
21Before=getty.target
22IgnoreOnIsolate=yes
23
24# IgnoreOnIsolate causes issues with sulogin, if someone isolates
25# rescue.target or starts rescue.service from multi-user.target or
26# graphical.target.
27Conflicts=rescue.service
28Before=rescue.service
29
30# On systems without virtual consoles, don't start any getty. Note
31# that serial gettys are covered by serial-getty@.service, not this
32# unit.
33ConditionPathExists=/dev/tty0
34
35[Service]
36# the VT is cleared by TTYVTDisallocate
37# The '-o' option value tells agetty to replace 'login' arguments with an
38# option to preserve environment (-p), followed by '--' for safety, and then
39# the entered username.
40#ExecStart=-/sbin/agetty --autologin pi --noclear %I $TERM
41ExecStart=-/sbin/agetty --autologin pi --noclear %I $TERM
42Type=idle
43Restart=always
44RestartSec=0
45UtmpIdentifier=%I
46TTYPath=/dev/%I
47TTYReset=yes
48TTYVHangup=yes
49TTYVTDisallocate=yes
50KillMode=process
51IgnoreSIGPIPE=no
52SendSIGHUP=yes
53
54# Unset locale for the console getty since the console has problems
55# displaying some internationalized messages.
56UnsetEnvironment=LANG LANGUAGE LC_CTYPE LC_NUMERIC LC_TIME LC_COLLATE LC_MONETARY LC_MESSAGES LC_PAPER LC_NAME LC_ADDRESS LC_TELEPHONE LC_MEASUREMENT LC_IDENTIFICATION
57
58[Install]
59WantedBy=getty.target
60DefaultInstance=tty1

p
1〇lightdm.confファイル 
2[Seat:*]
3#type=local
4#pam-service=lightdm
5#pam-autologin-service=lightdm-autologin
6#pam-greeter-service=lightdm-greeter
7#xserver-backend=
8#xserver-command=X
9#xmir-command=Xmir
10#xserver-config=
11#xserver-layout=
12#xserver-allow-tcp=false
13#xserver-share=true
14#xserver-hostname=
15#xserver-display-number=
16#xdmcp-manager=
17#xdmcp-port=177
18#xdmcp-key=
19#unity-compositor-command=unity-system-compositor
20#unity-compositor-timeout=60
21greeter-session=pi-greeter
22greeter-hide-users=false
23#greeter-allow-guest=true
24#greeter-show-manual-login=false
25#greeter-show-remote-login=true
26#user-session=default
27#allow-user-switching=true
28#allow-guest=true
29#guest-session=
30#session-wrapper=lightdm-session
31#greeter-wrapper=
32#guest-wrapper=
33display-setup-script=/usr/share/dispsetup.sh
34#display-stopped-script=
35#greeter-setup-script=
36#session-setup-script=
37#session-cleanup-script=
38#autologin-guest=false
39autologin-user=pi
40autologin-user-timeout=0
41#autologin-in-background=false
42#autologin-session=lightdm-autologin
43#exit-on-failure=false