Monitor stuck on displayport with 640x480

So I've just got a brand new Surface Book 3 (£2,699) and I'm running into the same issue everyone here has. Microsoft support came on screen share and tried reinstalling windows which of course didn't work, then told me to return it for a refund...

Before this overpriced paper weight goes back and I swap it for something that I can plug a monitor into, are there any known fixes for Surface Book 3 640x480 issue? All I'm seeing is Pro 7 & Laptop 3 fixes.

The funny thing is I've been using a Surface Pro 6 as my main work horse PC for a while now, and the dock works great at 2560x1440 120Hz. The HDMI solution I've read here allows me to change the resolution but not the refresh rate so I'm stuck at 60Hz. I'm not settling for 60Hz with a £2,699 piece of hardware. 

I guess the obvious and Microsoft endorsed solution is to buy the new £250 dock 2, but I already own 2x dock 1s so that's not something I'm willing to do right now.

Feel like Microsoft have already given up on the SB2. I mean just look at the reviews on most sites. Maybe nobody is buying them except for me :(

Not sure why we need to find fixes for Microsoft's problem - or rather why they don't take this solution and roll it out to users.  I am waiting for them to fix is as I still think there is funny business in advertising the MS dock to work with multiple monitors with the SP7.  

That said, I had high hopes the issue will be solved when my SP7 got the Windows 10 2004 update.  But, no, my second monitor still sits with a black screen and does not connect (display port on the dock to HDMI).

Yes I can confirm that HDMI ports of non surface docks work without problems. I just realised today that in my Lenovo thunderbolt gen 2, the display ports are working again properly. I dont what has changed. Now I dont need a solution to this problem.

I had the same issue with my new Surface Book 3. Just wanted to share my findings in case I can assist someone else.

TL;DR - Connect using HDMI if possible, avoid DisplayPort over USB-C (at least until Microsoft releases a driver update)

Full story:

I have a Dell Latitude 5290 2-in-1 from work, I also bought a Surface Book 3 (SB3) to replace my aging Surface Pro 4. I own a Dell D6000 USB-C dock (cheap DisplayLink dock that is flaky at best with the SB3) and a 1st-gen Surface Dock (also performed pretty badly with the SB3), and wanted to replace both with a better USB-C dock that supported DisplayPort over USB-C since I could now dock my new Surface Book 3 via USB-C vs. the proprietary Surface Connect.

I decided on the Dell WD19TB (Thunderbolt edition) because the Latitude 5290 supports Thunderbolt, and the dock is capable of falling back to DisplayPort over USB-C for non-Thunderbolt devices (like the SB3). The dock was connected to my Dell U3415W ultrawide monitor (via DisplayPort) and several USB peripherals. Everything worked beautifully with the Latitude 5290 via Thunderbolt, but I experienced the "640x480" issue when I connected the dock to my SB3. I tried manually installing the drivers for my monitor, updating the Intel graphics driver, etc. but the issue persisted.

A call with Dell support suggested that I had purchased the "wrong dock" (despite the information about it reverting the USB-C being published on their support site) and that I should exchange it for the non-Thunderbolt WD19. I arranged the exchange and waited for the new dock to arrive. Once I received it, I set it up exactly the same way and experienced the same issue...

I came across this thread and a few others and messed around with the version of the Intel Iris Plus graphics driver installed on my SB3. I saw that other people with the Surface Pro 7 and Surface Laptop 3 had success with downgrading to version 25.x (I do have a Surface Laptop 3 in the house that I may test this out on), but my Surface Book 3 is too new to have an older driver package available. I downloaded the 27.x (newer than the 26.x version on my Surface Book 3) from Intel, but that made things worse - nothing was displayed on the external monitor at all. I also attempted to download version 25.x from Intel, but that package would not install on the Surface Book 3.

I was about to give up and revert to the D6000 dock (I was getting random USB disconnects when using it with the SB3, but it was better than the 640x480 resolution and it least "worked" with both PCs). I then decided to try connecting the WD19 to my monitor via HDMI instead. Lo and behold everything just "worked". I have read concerns from others that HDMI may not deliver the same quality as DisplayPort, but for my needs I don't notice any discernible difference. Perhaps if Microsoft gets their act together on fixing the driver issue I will revert back to DisplayPort (after all, it would just be a simple cable swap), but for now I am just happy to have everything working as expected.

Hopefully this helps another SB3/SL3/SP7 owner out there!

PS: I also strongly suspect that the WD19TB would have worked just fine if I had switched to HDMI, but I can't confirm that as I didn't attempt that when I had it in my possession. Now I regret exchanging it since I can't take advantage of the Thunderbolt connection on the Latitude 5290. Thanks Dell support...

Here is the December 2019 bundle for Surface Pro 7. It should include the drivers

https://download.microsoft.com/download/0/8/b/08b0f0ba-1571-41c0-9b8a-9af8a43681ae/SurfacePro7\_Win10\_18362\_19.103.34215.0.msi

Here is the November 2019 Surface Laptop 3 Intel: 

https://download.microsoft.com/download/3/f/4/3f4f5dff-b6a9-4006-87aa-142a8e6f77cb/SurfaceLaptop3\_Win10\_18362\_19.112.27190.0.msi

Just extract all the files with something like: msiexec /a c:\testfile.msi /qb TARGETDIR=c:\temp\test

and then install the graphic drivers manually.

Great Find!  Thank you for posting this solution.  It still works as of today.