Updated: 2022/Sep/29
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AUICH(4) Device Drivers Manual AUICH(4)
NAME
auich - Intel I/O Controller Hub integrated AC'97 audio device driver
SYNOPSIS
auich* at pci? dev ? function ?
audio* at audiobus?
DESCRIPTION
The auich device driver supports the integrated AC'97 audio controller of
the Intel I/O Controller Hub. Supported chipsets include the i82801AA
(ICH), i82801AB (ICH0), i82801BA (ICH2), i82440MX, i82801CA (ICH3),
i82801DB (ICH4), i82801EB (ICH5), i82801FB (ICH6), i82801GB/GR (ICH7),
and Intel 6300ESB. The driver also supports SiS 7012, nForce MCP,
nForce2 MCP-T, nForce3 MCP-T, nForce3 250 MCP-T, nForce4, and AMD 8111.
The driver provides the following sysctl(8) read/write variable (when
hardware support is available):
hw.auich0.ac97rate
Link rate of the device in Hz. The driver automatically measures
and calculates the correct rate so you usually don't need to
change this. There is, however, a chance that the driver
miscalculates the rate especially on an emulated hardware,
resulting in an incorrect playback pitch. When this happens you
need to manually set this variable to the correct value. Try
48000 if you don't know the correct value as it is the default
link rate.
SEE ALSO
ac97(4), audio(4), pci(4), sysctl(8)
HISTORY
The auich device driver appeared in NetBSD 1.6.
BUGS
The `microphone' input DMA channel is not currently supported.
NetBSD 9.99 October 13, 2016 NetBSD 9.99