U4919DW, USB devices connect/disconnect when switching inputs

It seems that you're having an issue with the Dell U4919DW monitor when switching inputs between two computers. Whenever you switch inputs, you can hear the keyboard, mouse, and USB disconnect from the other computer. You're also wondering if there's a way to disable this and if there's a way to force one of the USB ports to always be on one input.

Regarding the first issue, the disconnection of the keyboard, mouse, and USB devices is expected behavior when switching inputs on the monitor. Unfortunately, there is no way to disable this behavior. It is a safety feature designed to prevent conflicts between devices and ensure that they work properly when connected to the correct computer.

Regarding the second issue, you can try assigning a USB upstream port to a specific input source using the On-Screen Display (OSD) menu. To do this, follow these steps:

1. Press the menu button on the monitor to open the OSD menu.
2. Navigate to the "Input Source" option and select the input source that you want to assign a USB port to.
3. Navigate to the "USB Selection" option and select the USB port that you want to assign to that input source.
4. Save the changes and exit the OSD menu.

Note that this will only work if your monitor has a USB hub and upstream ports that are associated with specific inputs. If your monitor does not have this feature, then you won't be able to assign a specific USB port to a specific input source.

I hope this helps! If you have any further questions or concerns, feel free to ask.

Got it. Thank you so much. Let me try this.