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[Jan Palak <jpalak@xxxxx>]

I have Asus N551JM too, and you shoud try this:
1. put in bash
$ sudo apt-get install alsa-tools-gui
2. open a hdajackretask with command $ hdajackretask
You will see a small window, select a codec Realtek ALC668 and check option "show unconnected pins" check "overwrite" in pin id: 0x1a and select internal speaker then "Apply now" and "install boot overwrite".
3. Reboot the system
4. In sound setting select profile that you want and you will hear a subwoofer

This result work for me.

** Package changed: alsa-driver (Ubuntu) => alsa-tools (Ubuntu)

** Changed in: alsa-tools (Ubuntu)
     Assignee: (unassigned) => Jan Palak (jpalak)

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https://bugs.launchpad.net/bugs/1405691

Title:
  No sound from subwoofer on Asus N551JM

Status in alsa-tools package in Ubuntu:
  Fix Released

Bug description:
  On Asus N551JM there is no sound from external subwoofer on fresh
  Kubuntu 14.10 installation. There is no "Bass speaker" in alsamixer.
  Adding "options snd-hda-intel model=asus-mode4" to /etc/modprobe.d
  /alsa-base.conf makes "Bass speaker" appears in alsamixer but I was
  unable to make it play any sound. On Win8 works out-of-box.

  Alsa-base version: 1.0.25+dfsg-0ubuntu4.

  Howto fix: redirect pin 0x1a to "Internal speaker (back)" using
  HDAJackRetask on codec Realtek ALC668. Contents of /lib/firmware/hda-
  jack-retask.fw:

  [codec]
  0x10ec0668 0x1043177d 0

  [pincfg]
  0x12 0x90a60130
  0x14 0x90170110
  0x15 0x04211020
  0x16 0x40000000
  0x18 0x411111f0
  0x19 0x411111f0
  0x1a 0x90170152
  0x1b 0x411111f0
  0x1d 0x40c6832d
  0x1e 0x411111f0
  0x1f 0x411111f0

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