Using a Dell UltraSharp USB-C Monitor with a Mac


Using a Dell UltraSharp USB-C Monitor with a Mac



The following article contains information about using an Apple Mac system with a Dell UltraSharp Monitor using a USB Type-C (USB-C) cable.


Table of Contents:

  1. Dell UltraSharp Monitors With USB-C
  2. Setting Up Your Monitor
  3. Troubleshooting USB-C Issues

Dell UltraSharp Monitors With USB-C

Note: This article applies to UltraSharp USB-C monitors.


Dell UltraSharp monitors with USB-C are compliant to USB-C standards and VESA display modes. Mac systems compliant to USB-C and VESA standards should work with Dell UltraSharp USB-C monitor.

Supported Dell UltraSharp monitors with USB-C for Mac systems.

Dell UltraSharp Monitor with USB-C USB-C Power Delivery over USB-C port USB Speed over USB-C port Maximum Resolution
U4919DW DP* Alt Mode 90 W USB 2.0 5120 x 1440 @ 60 Hz
U4320Q DP* Alt Mode 90 W USB 2.0 3840 x 2160 @ 60 Hz
U3219Q DP* Alt Mode 90 W USB 2.0 3840 x 2160 @ 60 Hz
U2720Q DP* Alt Mode 90 W USB 2.0/3.0 ** 3840 x 2160 @ 60 Hz
U2520D DP* Alt Mode 90 W USB 2.0/3.0 ** 2560 x 1440 @ 60 Hz
U2719DC DP* Alt Mode 65 W USB 2.0/3.0 ** 2560 x 1440 @ 60 Hz
U2419HC DP* Alt Mode 65 W USB 2.0/3.0 ** 1920 x 1080 @ 60 Hz
U2721DE DP* Alt Mode 65 W USB 2.0/3.0 ** 2560 x 1440 @ 60 Hz
U2421HE DP* Alt Mode 65 W USB 2.0/3.0 ** 1920 x 1080 @ 60 Hz
UP2720Q Thunderbolt 3 90 W USB 3.0 *** 3840 x 2160 @ 60 Hz

*DisplayPort
**USB 3.0 with USB-C Prioritization set to High Data Speed
*** With Thunderbolt 3


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Setting Up Your Monitor

Follow the instructions to set up your Dell UltraSharp monitor using USB-C connection.

  1. Connect your Mac system to the monitor using the USB-C or Thunderbolt 3 cable.
  2. On your Mac’s System Preferences, select Displays to choose your external monitor.
  3. Select Display tab to set your desired screen resolution.
  4. Select Color and set to Millions of Colors.
  5. Select Refresh Rate and set your Hertz to 60 Hz.
  6. Select Arrangement Tab to set your display mode to either Extended Desktop (uncheck the Mirror Displays button) or Mirror Displays (Figure 1).
    MacOS Display Settings
    Figure 1

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Troubleshooting USB-C Issues

  1. No video or Monitor not detected:
    • Check your USB-C or Thunderbolt cable. The USB-C cables that are provided with your Mac system may only support charging. Use the USB-C or Thunderbolt cable that is provided with your Dell UltraSharp monitor.
    • Check your graphics card specifications to make sure the display resolution is supported.
    • Check your graphics card driver for updates.
    • Check your monitor Input Selection to make sure it is set to "Auto Select" or "USB-C." This can be done through the monitor OSD menu. Refer to your monitor User’s Manual.
    • Get the system to detect the monitor. Go to System Preferences > Displays > Alt/Option key > Detect Displays.

  2. There is video, but the Mac system is not charging:
    • Use the USB-C or Thunderbolt 3 cable that is shipped with your Dell monitor.
    • Depending on the model, not all USB-C ports on the monitor support Power Delivery to charge your Mac system. Always connect to the USB-C port with Power Delivery logo (65 W or 90 W). Refer to Table 1 for more information.

      Example for the Dell UltraSharp U3219Q monitor (Figure 2):
      Dell Ultrasharp U3219Q Ports and Mac Connection
      Figure 2

  3. The monitor USB-C only provides 65 W or 90 W Power Delivery. Can it charge my Mac system?
    • Yes it can.
      Note: Your Mac system has higher power requirement, charging time may be longer. If needed, use the power adapter that is provided with your Mac system.

  4. I cannot get maximum resolution on the monitor:
    • Check your graphics card specification and make sure the video card can support the monitor’s maximum resolution.
    • Try using Extended Desktop mode. To do this, go to your Mac’s System Preferences > Displays > Arrangement Tab > Extended Desktop (make sure Mirror Displays is unchecked).

  5. Fuzzy or blurry image:
    • Make sure Display Resolution in System Preferences is set to Default and not Scaled.

  6. Font appears too small:
    • Try setting larger fonts in System Preferences. Go to System Preferences > Display. Select Larger Text from the Display Tab.

  7. Cannot control monitor’s speaker volume with Mac system’s keyboard controls:
    • Try setting the monitor as the main sound output device from System Preferences.

  8. Using a dock or adapter:
    • Dell does not recommend using a third-party dock or adapter to connect your Ultrasharp monitor with a Mac system.

  9. Intermittent performance of USB devices connected to monitor:
    • Depending on the UltraSharp monitor model, the supported USB bandwidth over USB-C connection is either USB 2.0 or USB 3.0. Using USB 3.0 devices (e.g. webcam, Ethernet adapter) on monitors that only support USB 2.0 speeds over USB-C may lead to intermittent performance of the connected devices.
    • Some Dell UltraSharp monitors (e.g. U2719DC) allow you to toggle the USB bandwidth over USB-C from USB 2.0 to 3.0 via USB-C Prioritization setting > High Data Speed. Refer to your monitor User’s Manual.

      Example for U2719HC OSD Menu (Figure 3)
      Dell U2719HC OSD Menu
      Figure 3

  10. Getting maximum resolution on Dell UltraSharp U4919DW ultrawide monitor:
    • Using Intel Graphics on your Mac system, you can display up to 3840 x 1080 resolution with the USB-C connection to the Dell U4919DW monitor.
    • For a higher resolution of 5120 x 1440 with the USB-C connection, use a Mac system with a non-Intel discrete graphics card (NVIDIA or AMD).

  11. macOS Power Chime when connected to U3419W or U3818DW monitor:
    • You may hear a power chime noise on some Mac systems while it is asleep and charging from a USB-C connection to a Dell U3419W or U3818DW monitor. Try one of the following to resolve the problem:
    • Update your OS and drivers.
    • Disable sleep on the Mac system. Go to System Preferences > Energy Saver > Prevent monitor from sleeping automatically when the display is off.
    • Disconnect the USB-C cable from your Mac system whenever you power off your system.
    • Use the power adapter provided with your Mac system to charge it.

  12. No Video when connected to UP2720Q:
    • The UP2720Q monitor ships with a Thunderbolt 3 (USB-C) Active Cable for connecting to a Thunderbolt 3 Mac system. Using this cable with a Mac system that only supports USB-C (with DP Alt Mode) may lead to No Video.
    • If you are using a Mac system with USB-C (with DP Alt Mode) such as MacBook 2015, please purchase a Thunderbolt 3 (USB-C) Passive Cable or USB-C DP Alt Mode Cable separately. Dell Part numbers for Thunderbolt 3 (USB-C) Passive Cable: A9905599, A9905597, A9269731.
      Note: You may see the following icon beside your Mac’s USB-C port - USB Icon for USB-C (with DP Alt Mode), Thunderbolt Icon for Thunderbolt 3.

  13. Is there a Mac version of the Dell Display Manager Software?
    • No. Dell is working closely with our software development teams to have a Mac version of the Dell Display Manager by early 2021.

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Article ID: SLN321048

Last Date Modified: 10/01/2020 12:16 PM

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