/usr/share/doc/alsa-base/driver/VIA82xx-mixer.txt is in alsa-base 1.0.25+dfsg-0ubuntu5.
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1 2 3 4 5 6 7 | VIA82xx mixer
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On many VIA82xx boards, the 'Input Source Select' mixer control does not work.
Setting it to 'Input2' on such boards will cause recording to hang, or fail
with EIO (input/output error) via OSS emulation. This control should be left
at 'Input1' for such cards.
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