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.Dd October 13, 2016 .Dt AUICH 4 .Os .Sh NAME .Nm auich .Nd Intel I/O Controller Hub integrated AC'97 audio device driver .Sh SYNOPSIS .Cd "auich* at pci? dev ? function ?" .Cd "audio* at audiobus?" .Sh DESCRIPTION The .Nm 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.
p The driver provides the following .Xr sysctl 8 read/write variable (when hardware support is available): l -tag -width Ds t Va 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 .Li 48000 if you don't know the correct value as it is the default link rate. .Sh SEE ALSO .Xr ac97 4 , .Xr audio 4 , .Xr pci 4 , .Xr sysctl 8 .Sh HISTORY The .Nm device driver appeared in .Nx 1.6 . .Sh BUGS The .Sq microphone input DMA channel is not currently supported.
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