The U3818DW User's Guide pages 6, 29, 56, states that to use the U3818DW USB hub correctly, you must connect the provided USB 3.0 upstream cable to the computer USB 3.0 port.
Just using the USB Type-C cable may provide enough power to the U3818DW USB hub, but due to the high resolution of 3840x1600 required by the U3818DW, you will be limited to USB 2.0 speed and you could experience "drops" of the U3818DW USB hub by the operating system.
Based on your troubleshooting, you have proven that the USB Type-C connection from the Latitude 7480 is intermittently failing to drive the U3818DW USB hub, thus, the devices connected to the U3818DW USB downstream ports are dropping. This could be a Latitude 7480 driver issue or an operating system power management setting, or simply that it cannot push it. That being the case, my advice is to simply connect the provided U3818DW USB 3.0 upstream cable to the U3818DW USB upstream port and the other end to the Latitude 7480 right side USB 3.0 port with PowerShare.
DELL-Chris M
Community Manager
•
56.9K Posts
0
June 18th, 2018 09:00
deadhead_314
5 Posts
0
June 18th, 2018 09:00
DELL-Chris M
Community Manager
•
56.9K Posts
0
July 21st, 2018 16:00
The U3818DW User's Guide pages 6, 29, 56, states that to use the U3818DW USB hub correctly, you must connect the provided USB 3.0 upstream cable to the computer USB 3.0 port.
Just using the USB Type-C cable may provide enough power to the U3818DW USB hub, but due to the high resolution of 3840x1600 required by the U3818DW, you will be limited to USB 2.0 speed and you could experience "drops" of the U3818DW USB hub by the operating system.
Based on your troubleshooting, you have proven that the USB Type-C connection from the Latitude 7480 is intermittently failing to drive the U3818DW USB hub, thus, the devices connected to the U3818DW USB downstream ports are dropping. This could be a Latitude 7480 driver issue or an operating system power management setting, or simply that it cannot push it. That being the case, my advice is to simply connect the provided U3818DW USB 3.0 upstream cable to the U3818DW USB upstream port and the other end to the Latitude 7480 right side USB 3.0 port with PowerShare.