Thunderbolt 4 symptoms
Thunderbolt 4 dock connected to XPS 13 9340 does not appear in Thunderbolt Control Center or does not provide display output, USB passthrough, or network connectivity
External monitor connected via Thunderbolt 4 cable to USB-C port shows no signal even though the cable is certified Thunderbolt 4
Thunderbolt 4 device appears as USB 3 device in Device Manager instead of Thunderbolt controller
Fixes
Install Intel Thunderbolt Controller Driver from Dell Support: Download the Intel Thunderbolt 4 controller driver for the Dell XPS 13 9340 from Dell Support. The XPS 13 9340 uses the Intel Thunderbolt 4 controller integrated into the Core Ultra 7 155H Meteor Lake-H platform. The Dell-certified Intel Thunderbolt driver enables Thunderbolt device authorization, device security settings, and full Thunderbolt 4 protocol features including 40 Gbps bandwidth and daisy-chaining. Without this driver, the Thunderbolt 4 port functions as a USB-C port only, with no Thunderbolt tunneling for displays or PCIe devices.
Authorize Thunderbolt Device in Dell XPS BIOS and Windows: When a new Thunderbolt 4 device is connected to the XPS 13 9340 for the first time, Windows shows a notification asking to authorize the device. Click Always connect to approve. Also check the Dell XPS BIOS → Security → Thunderbolt Security Level and set it to No Security or User Authorization to allow dock and device connections. Thunderbolt security set to High or disabled in BIOS prevents all Thunderbolt device connections, causing the port to behave as USB-C only.
Per Aminuddin Razak, IT manager deploying Dell XPS 13 9340 with Thunderbolt 4 docks for office workstations: “Thunderbolt 4 dock was not detected on the XPS 13 9340. Device Manager showed no Thunderbolt controller. Installed the Intel Thunderbolt driver from Dell Support and the dock appeared immediately. The Thunderbolt controller driver was not included in the standard Windows 11 install and needed to be added manually.”
Fix: Update Dell XPS 13 9340 BIOS
Download the latest BIOS for the Dell XPS 13 9340 from Dell Support. The Core Ultra 7 155H Meteor Lake-H platform Thunderbolt 4 controller is embedded in the SoC and managed by BIOS firmware. BIOS updates for the XPS 13 9340 include Thunderbolt controller initialization improvements, power delivery negotiation fixes for third-party docks, and Thunderbolt device enumeration timing corrections. Outdated BIOS can cause Thunderbolt 4 docks from non-Dell manufacturers to fail to enumerate even when the Intel Thunderbolt driver is installed.
Frequently Asked Questions
Why is Thunderbolt 4 not working on Dell XPS 13 9340?
Intel Thunderbolt driver is not installed from Dell Support, the Thunderbolt device is not authorized in Windows or BIOS Security settings, or the BIOS needs updating for Thunderbolt controller firmware fixes. Install the Intel Thunderbolt driver from Dell Support, authorize the device via Windows notification or BIOS Security Thunderbolt settings, and update BIOS via Dell Command Update.
How many Thunderbolt 4 ports does Dell XPS 13 9340 have?
The Dell XPS 13 9340 has two Thunderbolt 4 USB-C ports. Both ports support Thunderbolt 4 at 40 Gbps, DisplayPort 2.1, USB 3.2 Gen 2, and USB Power Delivery charging at up to 100W. External monitors, Thunderbolt docks, external storage, and eGPUs can be connected to either Thunderbolt 4 port on the XPS 13 9340.
Can I connect two external monitors to Dell XPS 13 9340 via Thunderbolt?
Yes. Connect a Thunderbolt 4 dock with multiple display outputs to one Thunderbolt 4 port on the XPS 13 9340. The dock can then provide two or more external monitor connections. The Core Ultra 7 155H Intel Arc integrated GPU supports multiple simultaneous displays via Thunderbolt 4. Two monitors via separate individual Thunderbolt 4 cables connected to the two XPS 13 9340 ports is also supported depending on the monitor display standard.
Why is the Dell XPS 13 9340 Thunderbolt 4 dock losing power after sleep?
The Thunderbolt 4 controller on the Core Ultra 7 155H platform enters a low-power state during sleep that may not correctly reinitialize the dock connection on wake. Update BIOS for the Thunderbolt controller wake firmware fix. Also open Device Manager, find the Intel Thunderbolt controller, Properties, Power Management, and uncheck allow the computer to turn off this device to save power to prevent the Thunderbolt controller from being suspended during sleep.
Conclusion
Thunderbolt 4 not working on the Dell XPS 13 9340 Core Ultra 7 155H is fixed by installing the Intel Thunderbolt 4 controller driver from Dell Support, authorizing the Thunderbolt device in Windows notification and BIOS Security settings, and updating BIOS for Thunderbolt controller firmware improvements on the Meteor Lake-H platform. The Intel Thunderbolt 4 driver is required for the XPS 13 9340 USB-C ports to operate in full Thunderbolt 4 mode with 40 Gbps bandwidth and support for docks, displays, and PCIe devices.
Ryan holds a Computer Science degree and has over 20 years of hands-on experience with PC hardware, software, and driver troubleshooting. He is the author behind softwaredriverdownload.com, where he helps everyday users fix driver issues quickly and accurately. Ryan has personally tested most of the fixes on this site across a range of Windows 10 and Windows 11 machines.
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