XPS 8920, dual monitor, Samsung S27E330 monitor hooked up to HDMI (Port 1) not working after latest Windows 10 update

You are probably better off using the HDMI port of your discrete graphic card rather than the HDMI port of the Intel integrated graphics. The discrete graphics card has better performance. As far as why the HDMI port of the  integrated graphic no longer works it is possible the Intel integrated graphics driver is not compatible with the latest Windows update or that the latest Windows update provides a new driver for the integrated graphics. I use three monitor and I run them all off the discrete graphics card. Another advantage of using only the discrete graphics card is that you are only dealing with one device driver. In some systems the integrated graphics is disable when a discrete graphics card is installed, but this does not appear to be the case with the XPS 8920.

Samsung S27E330 is standard 27 inch Full HD 1920 x 1080 display.  Nothing special.

Your latest update has disabled the INTEL HD 630 video drivers so you are now using the Generic VGA drivers.

You will have to reinstall the INTEL HD Graphics drivers and then re enable the monitor.

There is also a bios setting called INTEL Multi Display that must be ENABLED.

"There is also a bios setting called INTEL Multi Display that must be ENABLED."

Unless something has changed, according to the XPS 8920 Service Manual, there is no such BIOS setting.

http://topics-cdn.dell.com/pdf/xps-8920-desktop_reference-guide_en-us.pdf

Connecting the Monitor

NONE of the "Multi-Display" options work with the Default Microsoft VGA driver.

With the "Intel Multi-Display" option disabled you cannot used the iGfx card and have HDMI set as Primary Display.

With the "Intel Multi-Display" option enabled, the HDMI on iGfx will be the Primary Display and ports on other Gfx card display will become Secondary Display.

https://www.dell.com/support/article/us/en/04/sln268373/setting-up-multiple-monitors-using-intel-multi-display-option-in-windows-8?lang=en

https://www.intel.com/content/www/us/en/support/articles/000005580/graphics-drivers.html

BIOS Setup

• Restart your computer
• At the Dell logo, tap F2 until the message Entering Setup Appears
• Select Advance Setup
• Scroll down to Onboard Device Configuration and press Enter
• Scroll down to Intel Multi-Display and press Enter
• Select Enable and press Enter

More than 2 or even 3 options

Monitor Grid Connection

Support of iGfx and dGfx connections with/without Intel Multi Display option setup in BIOS.

Display Setting for Multiple Monitors

Intel Multi-Display option enabled: The HDMI port on iGfx card is set as Primary Display.

You need to read the OP initial post. His setup was working before the Windows 10 update.

In the XPS 8920 BIOS, there is no Onboard Device Configuration option nor is there an Intel Multi-Display option.

Also the Note in the Setup and Specification regarding the covering of the HDMI port and the DisplayPort port on the Back Panel if the computer is ordered with a discrete graphics card is a mistake. Those ports are not covered.

My solution is simple, just connect the two monitors to the discrete graphics card using adapters if necessary. No need for BIOS changes or issues with integrated graphics drivers.

"You need to read the OP initial post. His setup was working before the Windows 10 update."

I did read it.

The issue is that the INTEL GRAPHICS driver is no longer there.  DCH Drivers require specific things to be in place including updated certificates.  Several malware'd versions of the driver exist and are disabled by microsoft deliberately.  The microsoft Driver ONLY Supports 1 monitor period end.  It also does not support 2k or 4k resolution.

Microsoft VGA Adapter

This can happen because INTEL Multi Display is Disabled in Bios and or if the NEW INTEL HD driver is not loaded.   Temporarily removing the video card and manually updating drivers may help.

To install the new INTEL Video driver updates, do the following:

1. Click on the Start Menu in the Task Bar
2. Click Settings
3. In the Settings window, click “Update & Security”
4. Click “Check for updates”

Whether the Intel Integrated Graphics driver is there or not only the OP can tell us since we don't know the nature of his Windows 10 update. My point is that the discrete graphic card he has outperforms his integrated graphics and he should be connecting both monitors to it.

@jshine72 the best way to confirm hardware functionality at this point is to connect both monitors to the add in graphics card and boot the system into the BIOS (Power on the system and keep tapping the F2 key in rapid succession)

At it's lowest hardware level the system should output to the monitors connected via HDMI as the graphics card will take precedence over the onboard card.

Do the monitors display correctly in the BIOS, if yes then we know the hardware is functional and need to look at other troubleshooting steps.

As you system has an add in graphics card it is recommended for optimum performance to have the monitors connected to the add in graphics card.

Alan