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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