Dell Thunderbolt Dock WD22TB4 User Guide

Fans that continue to spin quickly and make abnormally loud noises might indicate a problem. Common causes for fans not working, abnormal, or loud fan noise, overheating:

• Fans or air vents that are obstructed
• Dust accumulation on vents or fans
• Not enough ventilation
• Physical damage
• Out-of-date BIOS and device drivers

• When plugging in the AC adapter and powering on the docking station, the fan turns on for sometime and subsequently powers down. This is by design and the docking stations is working as expected.

• The Dell Thunderbolt Dock WD22TB4 can charge your phone or other USB powered devices even without being connected to the system. However, the AC adapter must be connected to the docking stations for this to work.

• This is for Thunderbolt security. You are asked to approve a Thunderbolt device because the Thunderbolt Security level on your unit is set to “User Authorization” or “Secure Connect” in BIOS Setup. You will not see this page if the Thunderbolt Security level on your system is set to “No Security” or “DisplayPort Only”. Also, if you checked “Enable Thunderbolt Boot Support” in the BIOS Setup and power-on the system with the WD22TB4 dock attached, you will not see this page because the Security level is overridden to “No Security” in this case. When you are asked to approve a Thunderbolt device, you may select “Always Connect” if you do not have any security concerns to always allow the Thunderbolt device connection to your system. Or you may select “Connect Only Once” or “Do Not Connect” if you do have concerns.

• When a new device is plugged in, the USB hub driver notifies the Plug and Play (PnP) manager that a new device was detected. The PnP manager queries the hub driver for all of the device's hardware IDs and then notifies the Windows OS that a new device needs to be installed. In this scenario, the user will see a hardware installation window.

• The docking station is designed to operate on AC power only and it does not support system power source back (powered by system Type-C port). A power loss event will disconnect all devices connected to the dock . Even when you restore the AC power, the dock may still not function properly because the dock still needs to negotiate proper power contract with the system's Type-C port and establish a system EC-to-dock-EC connection.
• Disconnect and reconnect the AC adapter from the back of the docking station to fix this issue.

• To enable pre-boot setup options using F2 and F12 from the dock, you must enable boot support for thunderbolt devices and must set fast boot to Enabled or Auto Enabled in the BIOS.