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AC97(4)		       FreeBSD Kernel Interfaces Manual		       AC97(4)

NAME
     ac97 -- generic AC'97 codec driver

DESCRIPTION
     AC'97 codecs contain the analog to	digital	(A/D), digital to analog
     (D/A), and	mixing circuitry of many modern	sound cards.  AC'97 codecs,
     for the most part,	do not talk to host buses like the PCI bus directly.
     Instead, they communicate through an interface chip, called the host con-
     troller.  The Ensoniq AudioPCI 97 (see eap(4)) is an example of such a
     host controller.

     Unlike many drivers, the ac97 driver does not appear in the configuration
     file.  Instead, the driver	is automatically attached by the drivers that
     require it.

SEE ALSO
     auacer(4),	auich(4), auixp(4), autri(4), auvia(4),	clcs(4), clct(4),
     eap(4), emu(4), esa(4), fms(4), maestro(4), neo(4), yds(4)

BUGS
     The ac97 driver does not keep track of the	current	user settings and in-
     stead relies on the hardware to do	this.

     The ac97 driver could do more to detect mixer channels that don't work
     and cull them from	the list.

FreeBSD	13.0		       February	26, 2010		  FreeBSD 13.0

NAME | DESCRIPTION | SEE ALSO | BUGS

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