Article Number: 000133127
Follow these guidelines below for using your Dell monitor configured with USB Type-C input.
The USB Type-C output on the Dell TB16 and TB18 docks will not drive dual 2560x1440/60Hz monitors due to bandwidth limitations. The dock USB Type-C output provides both video content and USB data. Since this bandwidth has to be shared, the available video bandwidth is not enough to drive dual monitors with 2560x1440 resolution @ 60Hz.
USB Type-C MST Multi-Stream Transport (MST) Modes Examples:
Dell U2419HC Monitor:
OSD Display Info: Link rate (current) | Maximum number of external monitors that can be supported 1920x1080/60 Hz |
---|---|
DisplayPort High Bit Rate 3 (HBR3) | 2 |
DisplayPort High Bit Rate 2 (HBR2) | 1 |
Dell U2719DC Monitor:
OSD Display Info: Link rate (current) | Maximum number of external monitors that can be supported 2560x1440/60 Hz |
---|---|
DisplayPort High Bit Rate 3 (HBR3) | 1 |
DisplayPort High Bit Rate 2 (HBR2) | 0 |
You can still use MST (Multi Stream Transport) functionality. If your notebook has mini-DisplayPort (mDP) or your desktop has full-size DisplayPort (DP) output connections, then the first monitor plugs into the full-size DisplayPort and MST is set to ON. The first monitor then drives the second monitor. MST is set to off on the second display.
You can also connect directly to the dock by connecting to the DisplayPorts on the TB16 or TB18 Dock.
Dell Monitors are designed differently than the Dell Docking Stations intended for use with Dell laptops. The Dell USB Type-C monitors do not have a built-in Embedded Controller (EC) so they will have some limitations.
One limitation is when the laptop is in sleep state (S3 mode) and the laptop is connected to the monitor, the monitor will not wake the laptop. You will need to lift the laptop lid and press the laptop power button to wake the laptop from sleep.
Using the designated USB ports on the Dell monitor should not pose any USB functionality issues. For example, the Dell U3818DW monitor has 4 USB Downstream ports and connecting 4 devices to all 4 ports should not cause issues.
However, if external USB HUBs (Figure 1) are connected to these USB Downstream ports to obtain additional USB Downstream ports, there could be erratic USB and Video behavior due to excessive bandwidth being used.
Figure 1: Example of USB hub
Dell Thunderbolt Dock TB16, Dell Precision Dual USB-C Thunderbolt Dock - TB18DC
16 Feb 2024
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