# guest: root@dfbsd, DragonFly 6.5-DEVELOPMENT #0 X86_64_GENERIC, x86_64
# run: cc -o /root/probe /root/probe.c && /root/probe   (probe later removed)
FBIO_ADAPTER -> 0 index=0
sizeof(video_adapter_info_t)=184
index=0 type=5 name=vga unit=0 flags=7007f
io=3c0/20 mem=a0000/20000 window=0x800b8000 wsize=32768 gran=32768 orig=0
unused0=0 bufsize=32768 mode=24 initmode=24 biosmode=3 lw=80 ds=0,0
va_reserved bytes NOT touched by kernel: 0/64 (0 => fully zeroed by ioctl layer)
FBIO_MODEINFO vi_mode=0 (0x0) -> rc=-1 errno=19 (Operation not supported by device)
FBIO_MODEINFO vi_mode=2 (0x2) -> rc=-1 errno=19 (Operation not supported by device)
FBIO_MODEINFO vi_mode=999 (0x3e7) -> rc=-1 errno=19 (Operation not supported by device)
FBIO_MODEINFO vi_mode=-5 (0xfffffffb) -> rc=-1 errno=19 (Operation not supported by device)
FBIO_MODEINFO vi_mode=2147483647 (0x7fffffff) -> rc=-1 errno=19 (Operation not supported by device)
FBIO_FINDMODE -> 0 errno=19
  found mode 24 80x25