External power causes crash after using DisplayPort

I have an X1 Carbon Touch (older edition) running Debian Testing. It's been
working great for about 2 years since I first got it. However for the past
month or so it's had a very strange symptom. 

After a session in which I use the DisplayPort (via an HDMI dongle), the
next time I attach the external power cord, the machine immediately dies
(black screen, no LEDs). Powering up with the power cord attached causes an
endless loop of very brief boot-up (to the original BIOS screen), flashing
LEDs on the keyboard, then black screen and back to the BIOS screen. 

Removing the power cord allows the machine to boot normally. However,
plugging it back in causes it to crash immediately. 

The workaround is to fully halt the computer (using poweroff from a
super-user window), then plug the power cord back in and power up.

I don't think the log is very informative, but I am pasting below the log
from right as one of the crashes happens. Any thoughts or help will be much
appreciated.

Sep  1 12:29:50 simmel NetworkManager[791]: <info>  [1504283390.5449]
manager: sleep requested (sleeping: no  enabled: yes)
Sep  1 12:29:50 simmel NetworkManager[791]: <info>  [1504283390.5450]
manager: sleeping...
Sep  1 12:29:50 simmel NetworkManager[791]: <info>  [1504283390.5451] device
(E0:F5:C6:BF:3D:00): state change: disconnected -> unmanaged (reason
'sleeping') [30 10 37]
Sep  1 12:29:50 simmel NetworkManager[791]: <info>  [1504283390.5453] device
(F0:99:BF:55:23:34): state change: disconnected -> unmanaged (reason
'sleeping') [30 10 37]
Sep  1 12:29:50 simmel NetworkManager[791]: <info>  [1504283390.5454]
manager: NetworkManager state is now ASLEEP
Sep  1 12:29:50 simmel NetworkManager[791]: <info>  [1504283390.5482] device
(wlan0): state change: activated -> deactivating (reason 'sleeping') [100
110 37]
Sep  1 12:29:50 simmel dbus[752]: [system] Activating via systemd: service
name='org.freedesktop.nm_dispatcher'
unit='dbus-org.freedesktop.nm-dispatcher.service'
Sep  1 12:29:50 simmel NetworkManager[791]: <info>  [1504283390.5771] device
(wlan0): state change: deactivating -> disconnected (reason 'sleeping') [110
30 37]
Sep  1 12:29:50 simmel systemd[1]: Starting Network Manager Script
Dispatcher Service...
Sep  1 12:29:50 simmel acvpnagent[1345]: A network interface has gone down.
Sep  1 12:29:50 simmel acvpnagent[1345]: Function: logInterfaces File:
../../vpn/AgentUtilities/Routing/InterfaceRouteMonitorCommon.cpp Line: 477
IP Address Interface List: <REDACTED>
Sep  1 12:29:50 simmel acvpnagent[1345]: Function:
netInterfaceNoticeCategoryHandler File: ../../vpn/Agent/MainThread.cpp Line:
7388 Network Interface change detected, refreshing physical MAC addresses
Sep  1 12:29:50 simmel avahi-daemon[804]: Withdrawing address record for
<REDACTED> on wlan0.
Sep  1 12:29:50 simmel avahi-daemon[804]: Leaving mDNS multicast group on
interface wlan0.IPv6 with address <REDACTED>.
Sep  1 12:29:50 simmel avahi-daemon[804]: Interface wlan0.IPv6 no longer
relevant for mDNS.
Sep  1 12:29:50 simmel dbus[752]: [system] Successfully activated service
'org.freedesktop.nm_dispatcher'
Sep  1 12:29:50 simmel systemd[1]: Started Network Manager Script Dispatcher
Service.
Sep  1 12:29:50 simmel nm-dispatcher: req:1 'connectivity-change': new
request (1 scripts)
Sep  1 12:29:50 simmel nm-dispatcher: req:1 'connectivity-change': start
running ordered scripts...
Sep  1 12:29:50 simmel org.gnome.Shell.desktop[1608]: Window manager
warning: Failed to set power save mode for output LVDS36: Permission 
denied
Sep  1 12:29:50 simmel NetworkManager[791]: <info>  [1504283390.6488] dhcp4
(wlan0): canceled DHCP transaction, DHCP client pid 1836
Sep  1 12:29:50 simmel NetworkManager[791]: <info>  [1504283390.6488] dhcp4
(wlan0): state changed bound -> done
Sep  1 12:29:50 simmel avahi-daemon[804]: Withdrawing address record for
<REDACTED> on wlan0.
Sep  1 12:29:50 simmel avahi-daemon[804]: Leaving mDNS multicast group on
interface wlan0.IPv4 with address <REDACTED>.
Sep  1 12:29:50 simmel kernel: [ 1140.126364] wlan0: deauthenticating from
40:e3:d6:d3:82:90 by local choice (Reason: 3=DEAUTH_LEAVING)
Sep  1 12:29:50 simmel NetworkManager[791]: <info>  [1504283390.6616] device
(wlan0): set-hw-addr: set MAC address to 92:4C:73:2D:35:F0 (s
canning)
Sep  1 12:29:50 simmel kernel: [ 1140.139666] iwlwifi 0000:03:00.0: L1
Enabled - LTR Disabled
Sep  1 12:29:50 simmel kernel: [ 1140.146620] iwlwifi 0000:03:00.0: L1
Enabled - LTR Disabled
Sep  1 12:29:50 simmel kernel: [ 1140.146711] iwlwifi 0000:03:00.0: Radio
type=0x1-0x2-0x0
Sep  1 12:29:50 simmel kernel: [ 1140.414762] iwlwifi 0000:03:00.0: L1
Enabled - LTR Disabled
Sep  1 12:29:50 simmel kernel: [ 1140.421690] iwlwifi 0000:03:00.0: L1
Enabled - LTR Disabled
Sep  1 12:29:50 simmel kernel: [ 1140.421777] iwlwifi 0000:03:00.0: Radio
type=0x1-0x2-0x0
Sep  1 12:29:51 simmel acvpnagent[1345]: A network interface has gone down.
Sep  1 12:29:51 simmel acvpnagent[1345]: Function: logInterfaces File:
../../vpn/AgentUtilities/Routing/InterfaceRouteMonitorCommon.cpp Line: 477
IP Address Interface List:
Sep  1 12:29:51 simmel acvpnagent[1345]: Function:
netInterfaceNoticeCategoryHandler File: ../../vpn/Agent/MainThread.cpp Line:
7388 Network Interface change detected, refreshing physical MAC addresses
Sep  1 12:29:51 simmel avahi-daemon[804]: Interface wlan0.IPv4 no longer
relevant for mDNS.
Sep  1 12:29:51 simmel kernel: [ 1140.498832] IPv6: ADDRCONF(NETDEV_UP):
wlan0: link is not ready
Sep  1 12:29:51 simmel wpa_supplicant[927]: wlan0: CTRL-EVENT-DISCONNECTED
bssid=40:e3:d6:d3:82:90 reason=3 locally_generated=1
Sep  1 12:29:51 simmel nm-dispatcher: req:2 'down' [wlan0]: new request (1
scripts)
Sep  1 12:29:51 simmel nm-dispatcher: req:2 'down' [wlan0]: start running
ordered scripts...
Sep  1 12:29:51 simmel wpa_supplicant[927]: wlan0: CTRL-EVENT-REGDOM-CHANGE
init=CORE type=WORLD
Sep  1 12:29:51 simmel NetworkManager[791]: <warn>  [1504283391.0406]
sup-iface[0x55b28e62e6c0,wlan0]: connection disconnected (reason -3)
Sep  1 12:29:51 simmel NetworkManager[791]: <info>  [1504283391.0407] device
(wlan0): supplicant interface state: completed -> disconnected
Sep  1 12:29:51 simmel NetworkManager[791]: <warn>  [1504283391.0409]
sup-iface[0x55b28e62e6c0,wlan0]: connection disconnected (reason -3)
Sep  1 12:29:51 simmel NetworkManager[791]: <info>  [1504283391.0419] device
(wlan0): state change: disconnected -> unmanaged (reason 'sleeping') [30 10
37]
Sep  1 12:29:51 simmel /usr/lib/gdm3/gdm-wayland-session[2037]: Activating
service name='org.freedesktop.systemd1'
Sep  1 12:29:51 simmel /usr/lib/gdm3/gdm-wayland-session[2037]: Activated
service 'org.freedesktop.systemd1' failed: Process org.freedesktop.systemd1
exited with status 1
Sep  1 12:29:51 simmel gsd-sharing[2239]: Failed to StopUnit service:
GDBus.Error:org.freedesktop.DBus.Error.Spawn.ChildExited: Process
org.freedesktop.systemd1 exited with status 1
Sep  1 12:29:51 simmel gsd-sharing[2239]: Failed to StopUnit service:
GDBus.Error:org.freedesktop.DBus.Error.Spawn.ChildExited: Process
org.freedesktop.systemd1 exited with status 1
Sep  1 12:29:51 simmel gsd-sharing[2239]: Failed to StopUnit service:
GDBus.Error:org.freedesktop.DBus.Error.Spawn.ChildExited: Process
org.freedesktop.systemd1 exited with status 1
Sep  1 12:29:51 simmel NetworkManager[791]: <info>  [1504283391.3020] device
(wlan0): set-hw-addr: reset MAC address to 84:3A:4B:DB:4A:AC (unmanage)
Sep  1 12:29:51 simmel wpa_supplicant[927]: nl80211: deinit ifname=wlan0
disabled_11b_rates=0
Sep  1 12:29:51 simmel kernel: [ 1141.119073] thinkpad_acpi: docked into
hotplug port replicator




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