linux-stable-rt/Documentation/sound/alsa/VIA82xx-mixer.txt

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VIA82xx mixer
=============
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.