It's hard to try and run through things and test. So many combinations of stuff. I started having some crash problems and narrowed it down to issues with the integer scale mode. I'm using a Surface Book with Performance Base.
I get a blank screen with this combination
video_fullscreen_scale = 3
gfxcard = vga
video_fullscreen_scale = 3
gfxcard = et4000ax
These cause crashes if you start with the integer scale. If you start in no scale and run the computer, then switch to integer, you get a blank screen.
video_fullscreen_scale = 3
gfxcard = px_trio64
video_fullscreen_scale = 3
gfxcard = n9_9fx
video_fullscreen_scale = 3
gfxcard = bahamas64
(I did not try all combinations)