Dell Thunderbolt Dock WD22TB4 User Guide

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Port disablement

Port Disablement is a system feature that enables user to selectively disable DisplayPort or Thunderbolt protocols over USB Type-C ports.

New Gen MFDP (Multi-Function Display Port) Systems

  • The feature is offered through BIOS and requires user to boot to BIOS Setup Menu to activate/deactivate the feature.
  • Port Disablement is handled at low level and cannot be deactivated by operating system.
  • The Port Disablement is extended to Dell Docks by importing system configuration and applying the settings locally.
New generation of systems with MFDP Type-C ports offers following configuration options in BIOS:
  1. Enable/Disable External USB Port to enable/disable USB protocol over USB Type-A and Type-C ports.
  2. Enable/Disable Integrated NIC (this setting will be imported by Dock).
The table below illustrates how those settings will affect functionality of the Dock:
Table 1. New Gen MFDP (Multi-Function Display Port) SystemsThe following table shows the MFDB functionality of your docking station:
MFDP system Docked system configuration Dell WD22TB4 Dock
BIOS setup options Thunderbolt Module Base
Case Enable external USB ports Disable USB4 PCIe Tunneling Dock Override System Dock port power delivery modes Thunderbolt port LAN Video ports Type-C MFDP port Type-C USB port Type-A USB port
1 Off NA Off Power only Power only Disabled Disabled Disabled Disabled Disabled
On USB4/DP/USB DP By system setup DP/HDMI DP Disabled Disabled
2 On Off Off USB4/DP/USB USB4/DP/USB Enabled DP/HDMI DP/USB USB3/USB2 USB3/USB2
On USB4/DP/USB USB4/DP/USB By system setup DP/HDMI DP/USB USB3/USB2 USB3/USB2
On Off USB4/DP/USB USB4/DP/USB Enabled DP/HDMI DP/USB USB3/USB2 USB3/USB2
On USB4/DP/USB USB4/DP/USB By system setup DP/HDMI DP/USB USB3/USB2 USB3/USB2
New generation of systems with Thunderbolt ports offers following configuration options in BIOS:
  1. Enable/Disable Thunderbolt to activate Thunderbolt Controller and enable Thunderbolt protocol over USB Type-C port.
  2. Enable/Disable External USB Port to enable USB protocol over USB Type-A and Type-C ports.
  3. Enable/Disable Integrated NIC (this setting will be imported by Dock).
The table below illustrates how those settings will affect functionality of the Dock:
Table 2. New Gen TBT (Thunderbolt) SystemsThe following table shows the TBT functionality of your docking station:
MFDP system Docked system configuration Dell WD22TB4 Dock
BIOS setup options Thunderbolt Module Base
Case Enable external USB ports Video & power only Enable Thunderbolt Disable USB4 PCIe Tunneling Dock Override System Dock port power delivery modes Thunderbolt port LAN Video ports Type-C MFDP port Type-C USB port Type-A USB port
1 Off NA NA NA Off Power only Power only Disabled Disabled Disabled Disabled Disabled
On USB4/DP/USB DP By system setup DP/HDMI DP Disabled Disabled
2 On On NA NA Off DP DP Disabled DP/HDMI DP Disabled Disabled
On USB4/TBT/DP/USB DP By system setup DP/HDMI DP Disabled Disabled
3 On Off On Off Off USB4/TBT/DP/USB USB4/TBT/DP/USB Enabled DP/HDMI DP/USB USB3/USB2 USB3/USB2
On USB4/TBT/DP/USB USB4/TBT/DP/USB By system setup DP/HDMI DP/USB USB3/USB2 USB3/USB2
4a On Off Off Off Off USB4/TBT/DP/USB USB4/TBT/DP/USB Enabled DP/HDMI DP/USB USB3/USB2 USB3/USB2
On USB4/TBT/DP/USB USB4/TBT/DP/USB By system setup DP/HDMI DP/USB USB3/USB2 USB3/USB2
4b On Off On On Off USB4/TBT/DP/USB USB4/TBT/DP/USB Enabled DP/HDMI DP/USB USB3/USB2 USB3/USB2
On USB4/TBT/DP/USB USB4/TBT/DP/USB By system setup DP/HDMI DP/USB USB3/USB2 USB3/USB2
NOTE: PCIe tunneling is disabled so downstream PCIe devices won't be functional, no native Thunderbolt3 devices will be active.
NOTE: With Disable PCIe Tunneling Enabled, Dock Override shouldn't be allowed.
Legacy systems offer one extra option that was rarely used but made configuration very complex:
  1. Enable/Disable Thunderbolt to activate Thunderbolt Controller and enable Thunderbolt protocol over USB Type-C port.
  2. Enable/Disable External USB Port to enable USB protocol over USB Type-A and Type-C ports.
  3. Enable Dell Docks - dynamic override to extend system settings to boundary of the dock (dock port connected to Dell Dock was fully functional and Dock took care about handling dock port disablement locally).
  4. Enable/Disable Integrated NIC (this setting will be imported by Dock).
The table below illustrates how those settings would affect functionality of the WD22TB4 Dock (for reference only, please consult Dell Customer service for more details):
Table 3. Legacy Thunderbolt systemsThe following table shows the Legacy Thunderbolt functionality of your docking station:
TBT system Docked system configuration Dell WD22TB4 Dock
BIOS setup options Thunderbolt Module, Downstream port Base
Case External USB Thunderbolt Override to allow Dell dock System Dock port power delivery modes Type-C Thunderbolt port DP USB LAN Video ports Type-C MFDP port Type A and Type-C USB ports
1 On On N/A TBT/DP/USB Working Working Working By system setup Enabled DP/USB Enabled
2 On Off On TBT/DP/USB No function Working Working By system setup Enabled DP/USB Enabled
3 Off On On TBT/DP/USB Working Working No function By system setup Enabled DP mode Disabled
4 Off Off On TBT/DP/USB No function Working No function By system setup Enabled DP mode Disabled
5 On Off Off TBT/DP/USB No function Working Working By system setup Enabled DP/USB Enabled
6 Off On Off TBT/DP/USB Working Working No function By system setup Enabled DP mode Disabled
7 Off Off Off TBT/DP/USB No function Working No function Disabled Enabled DP mode Disabled

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