Dell UltraSharp U3415W User Manual page 48

USB Selection
USB 1
USB 2
48
| Operating the Monitor
Select the USB upstream signals from the list: DP, mDP, HDMI, and
MHL, thus the monitor's USB downstream port (eg. keyboard and
mouse) can be used by the current input signals when connecting a
computer to either one of the upstream ports.
The display and USB upstream ports connection can be changed by
selecting the input source function.
When you use only one upstream port, the connected upstream port
is active.
NOTE:
To prevent data damage or loss, before changing USB
upstream ports, make sure that NO USB storage devices are in use by
the computer connected to the monitor's USB upstream port.
Press to Indicate the input signal for USB 1.
Press to Indicate the input signal for USB 2.