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[Church <857150@xxxxxxxxxxxxxxxxxx>]

For docking station on my e6520 experienced similar issue of not easily telling docked state. Settled on usb device presence check. Compare lsusb outputs when docked/undocked.
For me it was:
Bus 001 Device 029: ID 413c:2513 Dell Computer Corp. internal USB Hub of E-Port Replicator
Thus you may try to incorporate lsusb usage as check to run scripts:
lsusb -d 413c:2513 2>&1 > /dev/null && notify-send -u normal docked || notify-send -u critical undocked

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https://bugs.launchpad.net/bugs/857150

Title:
  Dock not detected (Dell Latitude E6420 ; PR03X)

Status in “linux” package in Ubuntu:
  Expired

Bug description:
  My Dell E6420 is plugged to a Dell PR03X dock, but I cannot seem to
  find a corresponding device under /sys or /proc/acpi. Notably, there
  is no /sys/devices/platform/dock.0

  As a result, it seems that no kernel event is fired on (un)docking,
  thus making it quite difficult to automatically adjust monitor/display
  settings accordingly.

  I am really using the TuxOnIce variant of the mentioned kernel
  version, but the problem occurs in the official version as well.

  Ubuntu was installed on this laptop while it was not plugged to the
  dock, using the Alternate (text based) installer.

  ProblemType: Bug
  DistroRelease: Ubuntu 11.04
  Package: linux-image-2.6.38-11-generic 2.6.38-11.50
  ProcVersionSignature: Ubuntu 2.6.38-11.50-generic 2.6.38.8
  Uname: Linux 2.6.38-11-generic x86_64
  NonfreeKernelModules: nvidia
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.23.
  Architecture: amd64
  ArecordDevices:
   **** List of CAPTURE Hardware Devices ****
   card 0: PCH [HDA Intel PCH], device 0: STAC92xx Analog [STAC92xx Analog]
     Subdevices: 1/1
     Subdevice #0: subdevice #0
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  ysalmon    1497 F.... pulseaudio
  CRDA: Error: [Errno 2] Aucun fichier ou dossier de ce type
  Card0.Amixer.info:
   Card hw:0 'PCH'/'HDA Intel PCH at 0xe6760000 irq 45'
     Mixer name	: 'IDT 92HD90BXX'
     Components	: 'HDA:111d76e7,10280493,00100102'
     Controls      : 15
     Simple ctrls  : 10
  Card1.Amixer.info:
   Card hw:1 'NVidia'/'HDA NVidia at 0xe5080000 irq 17'
     Mixer name	: 'Nvidia GPU 1c HDMI/DP'
     Components	: 'HDA:10de001c,10280493,00100100'
     Controls      : 4
     Simple ctrls  : 1
  Card1.Amixer.values:
   Simple mixer control 'IEC958',0
     Capabilities: pswitch pswitch-joined penum
     Playback channels: Mono
     Mono: Playback [on]
  Date: Fri Sep 23 10:08:21 2011
  HibernationDevice: RESUME=UUID=37042d66-f766-40dc-b5f3-830ca0e8db5e
  InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release amd64 (20110426)
  MachineType: Dell Inc. Latitude E6420
  ProcEnviron:
   LANGUAGE=fr:en
   PATH=(custom, user)
   LANG=fr_FR.UTF-8
   SHELL=/bin/bash
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.38-11-generic root=UUID=589f8cef-d0a5-4c75-8abd-07d3b731ad28 ro reboot=pci --verbose
  RelatedPackageVersions:
   linux-restricted-modules-2.6.38-11-generic N/A
   linux-backports-modules-2.6.38-11-generic  N/A
   linux-firmware                             1.52
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 05/24/2011
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A05
  dmi.board.name: 032T9K
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A01
  dmi.chassis.type: 9
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: dmi:bvnDellInc.:bvrA05:bd05/24/2011:svnDellInc.:pnLatitudeE6420:pvr01:rvnDellInc.:rn032T9K:rvrA01:cvnDellInc.:ct9:cvr:
  dmi.product.name: Latitude E6420
  dmi.product.version: 01
  dmi.sys.vendor: Dell Inc.

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