OpenBSD-4.6/share/man/man4/auich.4

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.Dd $Mdocdate: October 19 2008 $
.Dt AUICH 4
.Os
.Sh NAME
.Nm auich
.Nd Intel ICH integrated AC'97 audio device
.Sh SYNOPSIS
.Cd "auich* at pci? flags 0x0000"
.Cd "audio* at auich?"
.Sh DESCRIPTION
The
.Nm
driver provides support for the integrated AC'97 audio controller present
on the Intel ICH I/O controller hub and compatible chipsets.
.Pp
Supported chipsets:
.Pp
.Bl -bullet -compact -offset indent
.It
AMD 768, 8111
.It
Intel 82440MX
.It
Intel 82801 (ICH, ICH0, ICH2, ICH3, ICH4, ICH5, ICH6, ICH7)
.It
NVIDIA nForce, nForce2, nForce3, nForce4
.It
SiS 7012
.El
.Pp
The
.Nm
DMA engine supports full-duplex operation and has separate channels
for line input and microphone.
Unfortunately, simultaneous recording from both line and microphone inputs
is not supported due to the current
.Xr ac97 4
design.
Setting
.Ar flags
to 0x0001 will compensate for machines that have reversed stereo.
.Sh SEE ALSO
.Xr ac97 4 ,
.Xr audio 4 ,
.Xr intro 4 ,
.Xr pci 4
.Sh HISTORY
The
.Nm
device driver appeared in
.Ox 2.8 .
.Sh CAVEATS
Some hardware implementations only support 48kHz sampling rates.