Symptoms

Have you upgraded to a WD22TB4, WD19, or WD19S series docking station after previously using one of the Dell docking stations such as WD15, TB16, TB18DC? You may encounter a warning message during the initial POST process. You may see a POST warning message that says: Multiple docking stations are not simultaneously supported This warning is displayed even though the WD22TB4, WD19, or WD19S series dock is the only docking station that is connected. Affected products: Figure 1: Dell WD22TB4 or WD19x series Docking Stations Note: This on-screen warning can occur when multiple docking devices are connected to the laptop simultaneously. Docking devices include devices that supply power to the laptop over a powered USB Type-C cable. (For example: An external monitor with an integrated USB Type-C hub that can provide power through the Upstream USB Type-C cable to the laptop.) Check your product manuals to see if any of the peripheral devices connected to your laptops USB type-C ports share this functionality: Dell Support Site Manuals Page Ensure that you either: Connect one powered USB Type-C device to the laptop and ensure that it supplies enough wattage to power the laptop.Connect a Dell USB Type-C wired dock to the laptop and connect the other peripheral devices through the wired dock. Do Not connect them directly to the laptop.

Cause

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Resolution

Clear and reset the BIOS to remove the history of the previous docking stations from the laptop. It also sets it up to accept the new one. The following steps take you through resolving the warning: Disconnect the docking station from your laptop.Boot into the BIOS: Restart the laptop.Tap the F2 key at the Dell Splash screen during the laptops startup. Clear the BIOS event logs: Go to System Logs and then BIOS Events.Clear the logs. Reset the BIOS to factory defaults by clicking the Restore Settings button.Reboot the laptop.Connect the docking station cable.The POST warning does not recur. However, if the warning persists contact: Dell Technical Support For compatibility and guidance on Docking stations, see these Dell Knowledge Base articles: WD19 series dock firmware update fails on computers with Windows 10 19H1 or higherUSB and USB Type-C Dock Compatibility ListGuide to Dell Docking Stations

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