Thunderbolt 4 Daisy-Chaining Not Working Correctly? Dell U2722DE USB-C 3.2 Gen 2 Issue

Abstract: Having trouble with Thunderbolt 4 daisy-chaining on your Dell U2722DE monitor? This article provides a brief overview of the issue, focusing on the use of the USB-C 3.2 Gen 2 upstream port and DisplayPort 1.4 for connecting two screens in a chain. Learn more about potential solutions for this tech support concern.

Created: 2025-01-04 by UserComp.com Editors

Thunderbolt 4 Daisy-Chaining Not Working Correctly? Dell U2722DE USB-C 3.2 Gen 2 Issue

Dell U2722DE, a modern 27-inch 4K monitor, is equipped with a USB-C 3.2 Gen 2 port that supports
DisplayPort 1.4 Alt Mode and delivers up to 90W of power. Unfortunately, some users experience
issues when trying to daisy-chain multiple displays using this port and a Thunderbolt 4
hub or dock.

Understanding Thunderbolt 4 and Daisy-Chaining

Thunderbolt 4 is the latest version of Intel's high-speed interface that provides up to
40Gbps of bandwidth. It supports daisy-chaining, allowing you to connect multiple displays
and peripherals to a single Thunderbolt 4 port in a daisy-chain configuration.


  Computer (TB4) -> Display 1 (TB4/DP1.4) -> Display 2 (DP)

Examining the Dell U2722DE USB-C 3.2 Gen 2 Port

While the Dell U2722DE features a USB-C 3.2 Gen 2 port, it does not support Thunderbolt
4. Instead, it supports DisplayPort 1.4 Alt Mode, which allows video, audio, and data
transmission over a single USB-C cable while utilizing the DisplayPort 1.4 protocol.


  Computer (USB-C 3.2 Gen 2) -> Display 1 (DP1.4 Alt Mode/power 90W)

Issues with Daisy-Chaining using Dell U2722DE USB-C 3.2 Gen 2 Port

Users have reported trouble when attempting to daisy-chain multiple displays through
the Dell U2722DE USB-C 3.2 Gen 2 port, resulting in various issues, such as flickering,
no signal, or limited performance.

The Role of the Upstream/DisplayPort 1.4 Port

The upstream/DisplayPort 1.4 port on the Dell U2722DE is critical when attempting to daisy-chain
additional displays. This port should be set in DisplayPort 1.4 mode to enable the
daisy-chaining functionality.


  Computer (TB4/USB-C 3.2 Gen 2) -> Display 1 (DP1.4 Alt Mode/power 90W)

 (Set DP1.4 mode for the upstream port) -> Display 2 (DP)

Samsung S27H85 and Daisy-Chaining Issues

Samsung S27H85 is another 4K monitor that users try to connect in a daisy-chain configuration
with the Dell U2722DE. However, similar to the U2722DE, the S27H85 has a single DisplayPort
input, which prevents the proper daisy-chaining functionality.

Recommendations and Workarounds

As the Dell U2722DE USB-C 3.2 Gen 2 port does not fully support Thunderbolt 4 features, daisy-chaining
additional displays can be challenging. Use a dedicated Thunderbolt 4 dock or hub
with multiple DisplayPort outputs to reliably connect multiple displays.

Thunderbolt 4: A high-speed interface supporting daisy-chaining of multiple
displays and peripherals through a single port.
Dell U2722DE USB-C: Supports up to 90W of power and DisplayPort 1.4 Alt Mode
over USB-C 3.2 Gen 2, but does not support Thunderbolt 4.
Daisy-Chaining: Can be problematic when using the Dell U2722DE USB-C port.
Use a Thunderbolt 4 dock or hub with multiple DisplayPort outputs.

References

Tags: Thunderbolt Daisy-Chaining Dell U2722DE USB-C Troubleshooting

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