USB Type-C monitors FAQ

Cable Matters USB Type-C to DP 1.4 converter cable

AmazonBasics USB Type-C to USB Type-A 3.1 Gen2 cable

Dell USB Type-C to USB Type-A cable part numbers =
7J2VJ = 1.8m/5.9ft, U2421E, U2720Q, U2720QM, U4320Q, P3222QE

$30.99 2m/6.5ft USB Type-C to C cable (5Gbps/USB 3.1-3.2 Gen 1 Type-C/100W 5A Power Delivery charging/DP Alt Mode)
User posted that it works on U4919DW

USB-C Prioritization

I will use the U2723QX/U2723QE/U3223QE for this example, "Cannot get 3840x2160 60Hz, only get 3840x2160 30Hz?".

* Open the U2723QX/U2723QE/U3223QE Menu- Display
* Go to USB-C Prioritization
* Verify it is set to High Resolution

USB-C Prioritization allows you to specify the priority to transfer the data with High Resolution or High Data Speed when using the USB-C port/DisplayPort. Note, the U2723QX/U2723QE/U3223QE USB-C port/DisplayPort only provides 90W power delivery to the PC. If your PC shipped with a power adapter greater than 90W, you may need to connect the PC power adapter.

USB Type-C monitor no longer getting signal from Laptop
* Turn the Laptop and USB Type-C monitor off
* Disconnect the USB Type-C to C cable from both

* Disconnect all cables from the monitor
* Press and hold in the monitor power button for 8 seconds
* Reconnect the power cable and USB Type-C to C cable to the monitor

* Connect the external power adapter to the Laptop
* Open the Laptop lid
* Turn the Laptop on and get all the way into Windows

* Turn the monitor on
* Connect the USB Type-C to C cable to the Laptop USB Type-C port

* Press Fn + F8, click Extend to extend the Laptop display to the monitor

* Click the monitor Menu button
* Go to Input Source
* Select USB Type-C. Does the Laptop Windows desktop now appear on the monitor?

USB-C Prioritization U3421WE, U3821DW

Allows you to specify the priority to transfer the data with High Resolution or High Data Speed when using the USB Type-C port/DisplayPort

If your PC is DP 1.4/HBR3, select High Data Speed to access full video performance with high data speed.

If your PC is DP 1.2/HBR2 or below, select High Resolution for accessing full video performance with data and network speed drop.

If your PC is DP 1.2/HBR2 or below, select High Data Speed for accessing limited video performance with NO data and network speed drop.

USB downstream ports always on when connecting via USB Type-C
Per the manufacturer design for all FY20 and later USB Type-C monitors, when connected via USB Type-C =
- The power to USB downstream ports is always on even though the monitor has entered Standby Mode
- The Menu options for "Other USB Charging" are ignored
- If you want the USB downstream ports to NOT have power when in Standby Mode, connect to the monitor via a different video in port

XPS 13 9350/XPS 15 9550/Precision 5510 No video with Dell Type-C monitors

A "No Video" issue may occur when you connect the older October 2015 XPS 13 9350/XPS 15 9550/Precision 5510 to any of the newer Dell USB Type-C monitors. The hardware for these older EOL (End of Life) laptops was developed well before the Dell USB Type-C monitors were introduced and there is a compatibility issue between the devices. There are no plans to modify the laptops to work with the newer Dell USB Type-C monitors. The Dell USB Type-C monitors are brand new (FY19 and later) devices and will work with the latest series of Dell laptops with USB Type-C outputs.

USB Type-C to C Gen 1, 1.8m/5.9ft, 100W, 5A, DP Alt Mode cable
N2X29 Foxconn = P2721Q
DH2XY TVE = P2421DC/P2422HE/P2720DC
JNC22 Qisda = UP3017Q/U3419W/U3421WE/U3818DW
9W8K8 Qisda = P2219HC/P2419HC/P2720DC
KPWHV Wistron = P2419HC/P2719HC/S2719DC/C8621QT
9H8JN Wistron = S2718D/S2719DC/UP3017Q
FF1M3 Wistron = C2422HE/S2422HZ/U2421HE/P2722HE/C2722DE/S2722DZ/U2721DE/P3221D/C3422WE

USB Type-C to C Gen 2, 1m/3.2ft, DP Alt Mode cable
F9V04 Qisda = U2422H/U2422HE/U2520D/U2520DR/S2722QC/U2722DE/U3421WE/U3821DW
F05PG Wistron = U2419HC/U2719DC/U2720Q/U2720QM/U4320Q
MRTCD Qisda = U2520D/U2520DR/U2720Q/U3219Q/U4919DW
2R4CW Wistron = U2421E/U2720Q/U2720QM/U2722D/U2722DE/P3222QE

M1W76 Qisda = USB Type-C to Type-A 1.8M, 2520D/U2520DR/UP2720Q/UP3221Q
PN81N Wistron USB Type-A to Type-B 1.8M

If your USB Type-C monitor shipped with the shorter 1M/3.2ft USB Type-C to C cable, it was by design. The usage of longer USB Type-C to C cable is not supported by Dell. Any issues that arise while using longer USB Type-C to C cable will not be troubleshot by Dell. Those monitors are to be used as docks typically with a Laptop. You can charge the Laptop, use the multiple monitor ports, etc. If connecting to a Desktop, you should be connecting to the video card via the DP to DP cable.

USB Type-C monitors, TB16/TB18 docks, no video when disconnecting monitor AC power cable

* Dell TB16/TB18 docks
- Docks USB Type-C --> Laptops USB Type-C
- Docks DP to monitors DP

If the user disconnects the power cable (why would the user do do this?) from the monitor while the monitor is in standby mode, there is no video when they reconnect. It is STRONGLY RECOMMENDED that users do NOT unplug the monitors AC power cable once the Laptops have been setup and running with the TB16/TB18 Dock. It is not a problem to turn off the monitors with the monitor power button at any time.

NOTE: There is no hardware fault with either the monitors or the docks. This issue only occurs when the AC power cable is disconnected from the monitor, which is outside the design parameters of the dock and the monitor.

USB Type-C monitors with DP out port, daisy chain setup

This is the Dell recommended setup =
* PC DP out port --> DP to DP cable --> #1 monitor DP in port (Menu- Display- MST On)
* #1 monitor DP out port --> DP to DP cable --> #2 monitor DP in port (Menu- Display- MST Off)

This Laptop setup is dependent on the Laptop USB Type-C bandwidth. But, in theory =
* Laptop has its AC power cable connected
* Laptop lid is closed
* Laptop USB Type-C --> USB Type-C to C cable --> #1 monitor USB Type-C in port (Menu- Display- MST On)
* #1 monitor DP out port --> DP to DP cable --> # monitor DP in port (Menu- Display- MST Off)

Dual monitor USB Type-C output on TB16 or TB18 Dock

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:

Dell U2719DC Monitor:

NOTE: Most PC platforms currently support HBR2 (High Bit Rate 2) and some monitors will indicate the bit rate on the monitors On Screen Display (OSD). Currently, with HBR2, we are unable to drive dual monitors at 2560x1440/60Hz monitors.
If your PC platform supported HBR3 (High bit rate 3), then it could drive dual monitors at 2560x1440/60Hz.

Workaround
You can still use MST (Multi Stream Transport) functionality. If your notebook has mDP or your desktop has full size DP output connections, then the first monitor plugs into the DP 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 DP on the TB16 or TB18 Dock. Dell USB Type-C monitors are not expected to perform identical to Dell laptop docking stations. 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. Laptops that have S1 mode sleep states will wake up when connected to the Dell USB Type-C monitors.

Dell USB Type -C monitors may have erratic behavior if excessive USB ports are populated

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 HUB's are connected to these monitor USB Downstream ports to obtain additional USB Downstream ports, there could be erratic USB and Video behavior due to excessive bandwidth being used.

NOTE: Dell cannot guarantee USB performance if you are running 15 USB Downstream ports.

USB Type-C bandwidth limitation

Possible but not tested by Dell 3rd party cable solutions =

$19.49 Cable Matters USB Type-C to C cable (1.8m/6ft, 4K 60Hz video, 5Gbps data transfer, 100W charging)
Compatible with USB Type-C monitor including the Dell U2520D, P2720DC, U2721DE, U2719DC, S2719DC, U2419HC, U2421HE, P2419HC

$39.99 Cable Matters Active USB Type-C to C cable (3m/10ft, 4K video, 10Gbps data transfer, 60W charging)
Compatible with USB Type-C monitor including the Dell U2520D, P2720DC, U2721DE, U2719DC, S2719DC, U2419HC, U2421HE, P2419HC