I’ve just applied “2019-08 Cumulative Update for Windows 10 Version 1903 for x64-based Systems”, aka KB4512941 to my Microsoft Windows Surface Book 2 – after my last attempt at updating the SB2 I have become very cautious about large updates to this hardware, even avoiding updating the video drivers.
Per the release notes, I don’t see anything related to any of the issues I’ve been having (e.g. screen flickering, and the Nvidia GPU being used for 3D apps even when I set it to use that GPU in the Nvidia control panel)
There are other issues that don’t seem to be mentioned in the patch notes. I’ll update this post further if/when I get any tangible results.