No sound from subwoofer on Asus N551JM

[Paweł Kowalczyk]

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

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Jan Palak (jpalak)]

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.