Desktop shows 3 monitors - 2 for UD3900 and 1 for internal HDMI

USB Docking Stations UD-3900
#1

I have a new desktop (Windows 11) that I’ve pugged via the pluggable USB3 switch into my UD3900.

It always shows the internal HDMI display in Windows 11 and makes it #1. I just want to see the 2 monitors attached to the UD3900 as #1/#2.

I’ll attach the debug file in a moment.

#2

Hi Rob,

Thank you for contacting Plugable! I am sorry to hear that your UD-3900 docking station is not functioning as expected, and would be happy to provide additional support.

To clarify, did you wish to just have your two external DisplayLink displays active?

Additionally, does the dock function as expected when it is plugged directly into your desktop (bypassing the switch)?

Thanks for your patience while we work to help!

Ryoma
Plugable Technologies
www.plugable.com/support

#3

Ryonna, Yes I want only the two DL displays active. Using the switch or not using it doesn’t seem to make a difference. Even with the 3rd monitor not physically connected to the Windows 11 desktop it still shows as an option and is the #1 monitor. That’s a problem because most programs display their screens on the #1 monitor (which in this case isn’t connected to the computer!).

#4

Hi Rob,

Thank you for letting me know!

It appears that this could be a phantom display issue. Windows thinks there is an external monitor active which it is opening those applications to, but to the user, it looks like nothing is occurring.

To try to fix this, we need to open up the Windows display settings, and disconnect the phantom display. However, the settings app is likely opening on the phantom display, so you can’t open up their display settings.

To get around this, you can try pressing the “Windows Key” + D, then pressing it again to try to get the windows to appear on main screen though.

If that doesn’t help, try the following actions here: https://winaero.com/blog/move-screen-window-windows-10/ as well.

If these fixes do not help, please let me know so I can take a different troubleshooting approach.

Thanks for your patience while we work to help!

Ryoma
Plugable Technologies
www.plugable.com/support

#5

Ryoma,

I’ve tried “disconnecting” the display in the Sysem >Display screen but it continues to show the device even when I reboot and there’s no physical connection to it. However my UD3900 screens do show up after a reboot and I can login.

The only thing I’ve noticed is that if I disable the display adapter, then the phantom monitor will disappear. The UHD Graphics 770 display adapter seems to take priority except when I disable it in the Device Manager.

Is there a setting in the BIOS that affects this?

#6

Hi Rob,

Thank you for the update!

For my reference, could you kindly provide a picture of the Display Settings screen, along a fresh set of logs via email for my inspection?

Could you please keep the dock connected to your system (with everything still attached) for this set as well? This will help determine if a BIOS update could help resolve the issue.

Thanks for your patience while we work to help!

Ryoma
Plugable Technologies
www.plugable.com/support

#7

I’ve decided that it would be easier to disable the motherboard graphics device than try to figure this out. I don’t think you have a solution that will work for this.

Please close this ticket!

Rob

#8

Hi Rob,

Thank you for letting me know!

I am sorry to hear that things did not work out, but if you have any other follow-up questions, please feel free to reach out at any time.

Thank you again for contacting Plugable support!

Ryoma
Plugable Technologies
www.plugable.com/support

#9

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