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Certain Dell monitors require a large video bandwidth, such as the U4919DW monitor. When these monitors use a USB Type-C connection, the USB 3.0 devices connected directly to the monitor may experience erratic performance.
The bandwidth is shared over the USB Type-C cable for both the USB video content and for any USB 3.0 data used by any USB 3.0 devices connected directly to the monitor when using a USB-type-C connection on these monitors. For example, when using dual monitors operating at the 2560x1440 or higher resolution, the video bandwidth over the USB Type-C connection is not enough to drive both monitors at the best resolution.
Dell Technologies recommends that you do not daisy chain devices through the monitor off of one cable. It is best practice to use two separate connections or cables coming from the computer: One for the video signal One for the added USB 3.0 devices An example would be to use the USB Type-C connection for all the USB 3.0 devices. Then, use a USB Type-C to DisplayPort dongle so that the DisplayPort can supply video to the monitor. Sometimes, video can also be obtained using the HDMI connection on the computer instead.
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