Comment 66 for bug 871808

>BTW, I'm afraid the proposed user_pin_configs isn't perfect either.
>On the n76 (but I suspect the same applies to the n56) there's a SPDIF out, shared with the headphone jack.
>The proposed user_pin_configs don't create any SPDIF output.

if this proprietary subwoofer is supported by asus laptop which use alc663 , just ignore the misc no_presence bit of pin default ane enable the unsolicited event with special event tag on pin 0x1e. define a customised alc_!633_unsol_event() to handle the event by snd_hda_get_pin_sense of 0x1e to handle the subwoofer at 0x16