CM_AC3EN1        1194 sound/pci/cmipci.c 		snd_cmipci_set_bit(cm, CM_REG_CHFORMAT, CM_AC3EN1);
CM_AC3EN1        1217 sound/pci/cmipci.c 		snd_cmipci_clear_bit(cm, CM_REG_CHFORMAT, CM_AC3EN1);