What I suggest is to install Intel web site drivers, to have the Intel control panel. When you'll do it, be sure to hide Windows Update, that will show up, called "System Hardware Update", which is the Surface 3 Intel drivers which will uninstall the Intel website drivers you just installed, and install back to the Surface 3 one. You'll need to repeat this step at every System firmware release (luckily it is not a common to have firmware upgrades).
On Intel website, when you download your graphics card drivers, be sure to download teh .zip version of the drivers, and not the .exe.
You need to do this, as the naming of the graphics solution is different, and the setup won't recognize the graphics card, and fail to lunch the setup. You'll need to install it via the Device Manager.
To do this, open device manager (you can search for it in the start menu search, or right-click on the start menu, and select "Device Manager"). On the panel, expand "Display adapters", under it, you'll find the Intel integrated graphics. Right-click on it, and select Uninstall, check the box to delete the drivers.
Once done, restart your system, and now IMMEDIATELY, to to Windows Update, find the "System Hardware Update" and hide it, before Windows installs it.
Then extract the Intel drivers zip file, now open Device Manager again (as it closed form your system restart), go back to Display adapters, and double click on the item you see under. A panel will open, go to the "Driver" tab, and click on the "Update Driver..." button.
A wizard will pop-up. Click on "Browse my computer for drivers software", click on the "Browse" button, and select the folder of where you extracted the Intel drivers you extracted a moment ago. Be sure the checkbox "Include subfolders" is checked. Click on Next. It should install them. Restart your system.
Once done, verify again that "System Hardware Update" in Windows update, doesn't show up again, if it does, hide it.
Once that is done, you should be good to go. Right-click on your desktop, and you should have Intel control panel option. Open it, go under Power (going by memory, sorry for the inaccuracies), then at the top left corner, next to the Back button, you have a down arrow next to "Power", click on it, and select "Battery" (yes, Intel really hiding it).
Then, you'll find "Display Power Saving Technology" (which as you can see, it is just dynamic contrast ratio, and after multiple measurements confirms it saves no battery life), select "Disable". Be sure that "Graphics Power Plan", didn't change to "Balance". Be sure it is at "Maximum Battery life". This is one of the many driver bugs from Intel graphic drivers that you expect to never be fixed as per usual.