If you happen to get a nice laptop with a powerful graphics card, such as polish HYPERBOOK SL502VR , it is highly probable that you will use UEFI boot mode. In that case you need to use
SCFB  driver instead of
VESA. Use the
xf86-video-scfb package to get Xorg running.
Hybrid Graphics at first used MUX device that did a LCD connect to a selected video card on boot. Nowadays both cards use common Video Framebuffer  to draw over a screen. The simple video card (Intel in my case) is always active, while the more powerful and power consuming video card is started on-demand (nVidia in my case). This however requires a dedicated DMA BUF implementation, which is not yet available on FreeBSD, so none of the cards can see any monitor connected, resulting in “No Screens Found Error” from Xorg.
I have already reported a bug/feature request to nVidia. Also developers of FreeBSD are working on the Hybrid Graphics implementation.