linux/Documentation/sound/alsa/VIA82xx-mixer.txt
<<
>>
Prefs
   1
   2                                VIA82xx mixer
   3                                =============
   4
   5On many VIA82xx boards, the 'Input Source Select' mixer control does not work.
   6Setting it to 'Input2' on such boards will cause recording to hang, or fail
   7with EIO (input/output error) via OSS emulation.  This control should be left
   8at 'Input1' for such cards.
   9