ICHD_MDMOUT
enum { ICHD_MDMIN, ICHD_MDMOUT, ICHD_MDMLAST = ICHD_MDMOUT };
return snd_intel8x0m_pcm_open(substream, &chip->ichd[ICHD_MDMOUT]);
chip->ichd[ICHD_MDMOUT].substream = NULL;
chip->ichd[ICHD_MDMOUT].ac97 = x97;