[PATCH] fix snd_ich support for Asus M2400N

[Mathew Kanner]

On Feb 21, Autrijus Tang wrote:
> (This is a folllow-up to misc/61388)

	Hello Autrijus,
	That PR hasn't been classified as sound yet.
	First let me say thanks for the patch.

> Hi. Here is a patch against -CURRENT that fixes ich4 support for
> pcm0: <SigmaTel STAC9750/51 AC97 Codec>.

> It works by backporting
> the legacy support for NAMBAR/NABMBAR from 5.1-RELEASE, instead
> of using the newer and broken MMBAR/MBBAR.

	I've quite confused by the statement above.  I think you mean
that FreeBSD-5.1+ has a problem where...and we need to enable legacy
mode on the ich4(only) by poking a register?

	Are you confident that if I commit this patch, it won't
disrupt other ich users? (It would be helpful if others with ich
hardware would let us know :) )

	Thanks,
	--Mat

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