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Using a Dell UltraSharp USB-C Monitor with a Mac

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

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No symptom information.


No cause information available.


Table of Contents:

  1. Dell UltraSharp Monitors With USB Type-C
  2. Setting Up Your Monitor
  3. Setting Up Multiple Monitor With Daisy Chain
  4. Setting Up Multiple Monitor With PIP, PBP, and KVM
  5. Troubleshooting USB Type-C Issues

Dell UltraSharp Monitors With USB Type-C

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

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

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

Dell UltraSharp Monitor with USB Type-C USB-C Power Delivery over USB Type-C port USB Speed over USB Type-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
U3421WE DP* Alt Mode 90 W USB 2.0/3.0 ** 3440 x 1440 @ 60 Hz
U3821DW DP* Alt Mode 90 W USB 2.0/3.0 ** 3840 x 1600 @ 60 Hz
U4021QW Thunderbolt 3   90 W USB 3.0 ** 5120 × 2160 @ 60 Hz

Table 1: Supported Dell UltraSharp monitors with USB Type-C for Mac systems.

**USB 3.0 with USB Type-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 Type-C connection.

  1. Connect your Mac system to your monitor using the USB Type-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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Setting Up Multiple Monitor With Daisy Chain

  • Macs support monitor Daisy-Chain using USB-C Thunderbolt 3 connectivity.
  • Typically, the Mac can support up to two monitors via a Daisy-Chain setup (one monitor directly connected to the Mac and another monitor connected to the first monitor).
  • To perform a monitor Daisy-Chain, the Mac needs to have a Thunderbolt 3 port, and the first monitor (connected directly to the Mac) must also support Thunderbolt 3 (example: Dell UP2720Q monitor).
  • The resolution supported by the Daisy-Chained monitors may be lower, depending on the bandwidth required by each monitor.
Note: Macs with USB-C (DP Alt Mode) do not support monitor Daisy-Chaining. When connected in a Daisy-Chain setup, both monitors will be in clone mode.

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Setting Up Multiple Monitor With PIP, PBP, or KVM

PIP (Picture in Picture) and PBP (Picture by Picture) let you use your monitor simultaneously with two attached computers. KVM lets you control up to 2 computers from a single set of keyboard and mouse connected to the monitor.

Some large screen Dell Ultrasharp USB-C monitors come with these features to help you maximize productivity.

Dell Ultrasharp
Monitor with USB-C
U4919DW Yes Yes
U4320Q Yes No
U3219Q Yes Yes

Please refer to your monitor User’s Guide on instructions to set up PIP, PBP, or KVM Switch.

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Troubleshooting USB Type-C Issues

  1. No video or Monitor not detected:
    • Check your USB Type-C or Thunderbolt cable. The USB Type-C cables that are provided with your Mac system may only support charging. Use the USB Type-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 Type-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 Type-C or Thunderbolt 3 cable that is shipped with your Dell monitor.
    • Depending on the model, not all USB Type-C ports on the monitor support Power Delivery to charge your Mac system. Always connect to the USB Type-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 Type-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:
    • MacOS does not allow you to control sound volume or screen brightness of externally conected devices via the system's keyboard controls. Use the Monitor's OSD control buttons to adjust the speaker volume or screen brightness.

  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 Type-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 Type-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 Type-C from USB 2.0 to 3.0 via USB Type-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 Type-C connection to the Dell U4919DW monitor.
    • For a higher resolution of 5120 x 1440 with the USB Type-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 Type-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 Type-C cable from your Mac system whenever you power off your system.
    • Use the power adapter provided with your Mac system to charge it.
    • Intel no longer supports single-port 5K resolution on external monitors. 2 ports need to be plugged in to get a 5K resolution on external 5K monitors if the system only has Intel integrated graphics.

  12. No Video when connected to UP2720Q:
    • The UP2720Q monitor ships with a Thunderbolt 3 (USB Type-C) Active Cable for connecting to a Thunderbolt 3 Mac system. Using this cable with a Mac system that only supports USB Type-C (with DP Alt Mode) may lead to No Video.
    • If you are using a Mac system with USB Type-C (with DP Alt Mode) such as MacBook 2015, please purchase a Thunderbolt 3 (USB Type-C) Passive Cable or USB Type-C DP Alt Mode Cable separately. Dell Part numbers for Thunderbolt 3 (USB Type-C) Passive Cable: A9905599, A9905597, A9269731.
      Note: You may see the following icon beside your Mac’s USB Type-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?
    • Yes, the Mac version of Dell Display Manager is now available. Supported macOS and Apple products include:
      • macOS 10.14, 10.15, 11
      • MacBook Pro, Air, Mac Mini launched from 2018 onwards
      • Mac Pro launched from 2019 onwards
      • Macs with Intel or M1 chipset

      Go to for a list of Dell displays that support DDM for Mac.
      Note: Your Dell displays need to be updated to the latest firmware version to work with DDM for Mac. To download the latest firmware:
      • Go to Dell Drivers & Downloads page: Dell Drivers & Downloads Page
      • Enter your Display model or Service Tag.
      • Select your operating system (Apple macOS) and download the firmware package.

    More information about: Dell Display Manager Software for Mac

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Article Properties

Affected Product

Dell U2419HC, Dell U2421HE, Dell U2520D, Dell U2719DC, Dell U2720Q, Dell U2721DE, Dell U3219Q, Dell U3421WE, Dell U4320Q, Dell U4919DW, Dell UP2720Q

Last Published Date

23 Sep 2021



Article Type