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Solved Windows 10 20H2 update screen resolution issue: ultrawide monitor connected to Microsoft Surface Dock

 Today I received the Windows 10 version 20H2 update on my corporate Microsoft Surface. After rebooting I had screen resolution issues on my external Dell Ultrasharp 3419W ultrawide monitor which was connected to the Surface Dock. Instead of the 3440x1440 resolution my monitor started with a 1024x768 resolution. When I tried to change the resolution back to the 3440x1440 setting I noticed that the highest supported resolution was 1280x1024.

When I connected the monitor directly to the Surface the native resolution of 3440x1440 was back. Updating and removing the general monitor driver did not help either. When I downgraded back to Window 10 2004 the problem was gone and support for 3440x1440 was back on the Surface dock.

I finally figured out how to solve the issue between the Surface dock and Windows 10 20H2. I downloaded the official Dell driver for my monitor and changed the generic driver to this Dell U3419W driver. Then I reinstalled the Windows 10 20H2 feature update and when I rebooted the monitor connected on the Surface dock was still using the native 3440x1440 resolution.

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