Hi,
I have Nexus 5X and 6p, android oreo.
I've tried all the combinations with:
[rawdisplay]
driver=SURFACE_ENGINE ;GDI GX engine gles
force_renderer=RENDER_MOYA ;SOFTWARE_RENDER RENDER_GLES

Unfortunately it doesn't work, screen is still black.
Additionally when I use value - gles, Primo starts and stops. Gles is useless for Nexus.

[debug]
show_rawdisplay_info=1 ;gives driver=SURFACE_ENGINE

Of course NextGen works very well.