With NetBSD 9.2:
 - kernel mode setting freezes
 - had to disabled the i915drmkms driver at boot

From: http://wiki.netbsd.org/tutorials/x11/how_to_use_wsfb_uefi_bios_framebuffer/

At the bootloader prompt, pass the -c flag to the kernel:

> boot -c

The kernel will display a few lines, then immediately drop into the userconf prompt:

uc> list                        # list all devs; look for your drmkms entry
uc> disable i915drmkms          # disable Intel DRM
uc> quit


We should wait for a new DRM import in NetBSD (10 or 11...)