AC97_REG_HEADPHONE_VOLUME
if (as->source_info[i].reg == AC97_REG_HEADPHONE_VOLUME)
as->source_info[i].reg = AC97_REG_HEADPHONE_VOLUME;
AC97_REG_HEADPHONE_VOLUME, 0x8000, 6, 0, 1, 0, CHECK_HEADPHONES
cs4281_write_codec(sc, AC97_REG_HEADPHONE_VOLUME, 0);