module loads from kldload, but gives "Unsupported file type" from loader.conf

[Steve Franks]

I successfully built snd_hda on my 6.3amd64 system, so I placed it in
loader.conf (snd_hda_load="YES"), when I boot, dmesg shows:

kldload: Unsupported file type

If I sudo kldload snd_hda, dmesg shows:

kldload: Unsupported file type
kldload: Unsupported file type
pcm0: <Intel 82801G High Definition Audio Controller> mem
0xfdff8000-0xfdffbfff irq 16 at device 27.0 on pci0
pcm0: <HDA Codec: Realtek ALC883>
pcm0: <HDA Driver Revision: 20071129_0050>

Note: on startup, there is one unsupported, after kldload, there is
two, but the module loads sucessfully!

Anyone heard of this ?!?

Steve