Dell Precision 5690 Core Ultra 9 185H Thunderbolt 4 Not Detected Fix

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Overview
Update TB driver
BIOS TB settings
Update dock firmware
Reinstall controller
FAQ

Dell Precision 5690 Thunderbolt 4 Not Detected Fix

Dell Precision 5690 · Core Ultra 9 185H · Windows 11 · TB4 / USB4

The Thunderbolt 4 ports on the Dell Precision 5690 can stop detecting docks, displays, or external drives after a driver update or BIOS change. Follow these steps to restore full Thunderbolt functionality.

Step 1 — Update the Thunderbolt controller driver

Go to Dell Support, find the Precision 5690, and download the latest Intel Thunderbolt Controller driver. Install it and restart. This is the primary driver controlling device enumeration on the Thunderbolt bus and is the most common fix for detection failures on new Intel platforms.

Step 2 — Check Thunderbolt security level in BIOS

Restart and press F2 to enter BIOS. Go to Security → Intel Thunderbolt (or similar). If security level is set to SL3 (Secure Connect), every new Thunderbolt device requires manual approval. Set it to SL1 (User Authorization) or No Security to allow devices to connect without per-device approval each session.

Step 3 — Update the docking station firmware

Connect the dock and run the Dell Docking Station Firmware Update Utility downloaded from Dell Support. Firmware mismatches between the dock and the Precision 5690 Thunderbolt controller are a frequent cause of detection failures that survive driver updates.

Step 4 — Reinstall the Thunderbolt controller in Device Manager

Open Device Manager → System devices. Find the Intel Thunderbolt Controller entry, right-click, and choose Uninstall device. Disconnect all Thunderbolt devices. Restart and reconnect the device. Windows reinstalls the controller driver and re-enumerates the Thunderbolt bus cleanly.

Step 5 — Update the BIOS

Check Dell Support for BIOS updates for the Precision 5690. Dell regularly releases BIOS updates for workstation models that improve Thunderbolt controller initialization and fix compatibility issues with specific docks and peripherals on the Core Ultra 9 185H platform.

Ahmad, Kuala Lumpur: “My Precision 5690 stopped detecting the Dell WD22TB4 dock after a BIOS update. Updating the Thunderbolt driver from Dell Support and changing the TB security level in BIOS fixed it within 10 minutes.”

Frequently Asked Questions

Why does Thunderbolt 4 stop working after a BIOS update on the Precision 5690?

BIOS updates can reset Thunderbolt security settings or change controller initialization parameters. After any BIOS update, check the Thunderbolt security level in BIOS and update the Thunderbolt controller driver from Dell Support.

How do I check if a device is blocked in Thunderbolt security settings?

Open Thunderbolt Software from the system tray or Start menu. It shows all connected Thunderbolt devices and their approval status. Devices with a warning icon need to be manually approved by clicking Allow.

Does the Precision 5690 support USB4 as well as Thunderbolt 4?

Yes. The Thunderbolt 4 ports on the Precision 5690 are backward-compatible with USB4, USB 3.2, and USB 2.0 devices. Thunderbolt 4 certified devices will negotiate the highest supported speed automatically.

Will a non-Thunderbolt USB-C dock work on the Precision 5690?

Yes. USB-C docks without Thunderbolt will work at USB 3.2 speeds on the Precision 5690 TB4 ports. However, they will not support daisy-chaining or more than one 4K display output at 60 Hz, which requires Thunderbolt bandwidth.