https://git.kernel.org/cgit/linux/kernel/git/tiwai/sound.git/commit/?id=ea9b43addc4d90ca5b029f47f85ca152320a1e8d


!!PCI Soundcards installed in the system
!!--------------------------------------

00:0f.0 Audio device: Silicon Integrated Systems [SiS] Azalia Audio
Controller

!!Aplay/Arecord output
!!--------------------

APLAY

**** List of PLAYBACK Hardware Devices ****
card 0: SIS966 [HDA SIS966], device 0: ALC663 Analog [ALC663 Analog]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 0: SIS966 [HDA SIS966], device 3: ALC663 Digital [ALC663 Digital]
  Subdevices: 1/1
  Subdevice #0: subdevice #0



you have to send email to the author 

your notebook spec support SPDIF and HDMI

there are only one HDA controller and one HDA codec alc663

codec alc663 have primary and secondary digital output and node 0x1e
SPDIF and 0x11 HDMI pin complexes

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https://bugs.launchpad.net/bugs/1259070

Title:
   N90SV, Realtek ALC663, Mic, Internal  Underruns, dropouts or
  crackling sound

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