USB3 to VGA adapter working under Admin but not User account

[MarkHNZ]

Kia ora (hello) I am trying to extend my desktop to an external HP EliteDisplay E221i via a USB3-to-VGA adapter. I have installed the drivers, rebooted the PC and find that the adapter is recognised (usb extscreen, XXX USB Display) under both User and Admin accounts.

In the Admin account, the external display is recognised and can be used as a second screen, but under the User account the display isn't recognised. 

Seems like a permissions thing, but I don't know what to do do. Any suggestions ?

[The adapter came with a CD installation disk to install the drivers which I did from the User account and rebooted.]

[BeemerBiker]

Is the system part of a domain where a group policy may be applied?  

What type of user did you create?

It is possible that for some limited users the ability to make display change is not allowed.  I was unable to duplicate the problem you described when adding a non-administrator (authenticated) user.

[MarkHNZ]

Thanks. Standard user profile that has been in use for a few years. I will uninstall and install under the Admin profile and then log in to the Standard profile and see if that helps.

[MarkHNZ]

I did this and still not working under Standard profile.

However, I can advise that while the 'usb extscreen' device is still recognised, 'Windows USB Display' is not listed in the Standard profile applications startup settings, while it is in the Admin profile. 

Any ideas ?

Thanks very much for your assistance. Looking forward to solving this and having 2 displays under my usual (standard) profile.

[BeemerBiker]

I just realized that you used a USB3 "dongle" to the external monitor.  I was using USBC video port on RTX card.  That is not the same as the drivers are part of the NVidia install and running under system .  Your USB to VGA drivers are loaded when the user logs in.  It seems to me that any authenticated user would be able to plug in the USB adapter and have the monitor enabled. 

I did not mention it earlier but I had also set group policy to deny read/write to USB storage and that worked.  ie:  I was able to use the external monitor over USBC but could not use a flash drive.

Thinking about that now, the flash drive was denied as the driver starts up when the flash is inserted but the USBC is part of the system or :"kernel".

This problem must have discovered long ago.  I recall using a USB2 adapter to add a monitor to instruments running windows XP from ROM.  You might ask at the manufacturer support site or especially over at answers.microsoft.com.  Microsoft also has a technical forum for developers or insides and the same password is used.

My guess is the driver is not running in a privileged (admin) state.  You may have to hunt for where it was installed using mmc.exe When (if) you find it then the startup instructions need to be changed so it runs as system instead of user.  If you find out please come back and post how it was done.

I have some ideas that might work but I do not have a way to test them.

You mentioned Standard profile applications startup so I assume you are using a guide like the following

https://docs.microsoft.com/en-us/windows-hardware/manufacture/desktop/customize-the-default-user-pro...

I am not familiar with setting up custom users profiles, sorry.

Question:  Does the device manager display any errors when logged in as a standard user?  If so, there may be a way to enable it using an app running as "admin" when the user logs in.

[MarkHNZ]

Thanks Beemer. Much appreciated. 'Dongle' is a generic one. Installed with 'Windows7-Windows10_2.0.2.exe'.

[Question:  Does the device manager display any errors when logged in as a standard user?] No.

I will follow-up with 'answers.microsoft.com' and revert. Likely not till the weekend.

Thanks again/Mark