I have bought Asus G550JK laptop(G version of N550) and installed Ubuntu 14.04 on it. I'm just a beginner in using Ubuntu, but I managed to make everything work fine except the external SonicMaster subwoofer. There is no 2.1 option in Sound Settings, I think Ubuntu doesn't see the subwoofer. I tried many solutions, but I only managed to enable 2.1 settings with subwoofer, but when I check the sound I can only hear some noises from the laptop, not the subwoofer.

I have added this at the end of the file:


options snd-hda-intel model=asus-mode4

but it doesn't change anything.

Also, adding

[Mapping analog-surround-21]

device-strings = surround40:%f

channel-map = front-left,front-right,lfe,lfe

paths-output = analog-output analog-output-speaker

priority = 7

direction = output

to the file:


doesn't help.

Of course I changed the line in



enable-lfe-remixing = yes

but all in all, it leads to nothing. I managed to enable 2.1 by adding the line:

load-module module-combine channels=3 channel_map=front-left,front-right,lfe

to the file:


but, as I said, during the subwoofer check in Sound Settings I only heard some noises from the laptop.

Have you got any idea how to get it working? Thanks for any help. :)

2 Answers 2


I found the solution to your problem!

  • Install alsa-tools-gui (sudo apt-get install alsa-tools-gui)

  • Start hdajackretask (either enter that in the terminal or find it in Unity)

  • Select the codec: Realtek ALC668

  • Check Options -> Show unconnected pins

  • find Pin ID: 0x1a

  • check Override and select Internal speaker (LFE)

  • press Apply now

If it works fine, select Install boot override and reboot.

Have fun with your subwoofer!

  • and with Asus N751JK. Thanks, amazing.
    – dentex
    Commented Jun 13, 2015 at 17:09
  • And with the N551JK as well. Commented Jun 27, 2015 at 8:19
  • This one doesn't work for my Asus N751JK and Ubuntu 16.04. Are there any differences between 14.04 and 16.04?
    – ezze
    Commented Jun 29, 2017 at 12:10

Although the solution given by Mike works for many people, some models have different pins. If you're using ASUS N56JR you'll follow the following as arch's documentations say:

Install alsa-tools-gui if you haven't already.

sudo apt-get install alsa-tools-gui

Then open hdajackretask (you might have to open it with sudo privileges to make the changes take effect):

  • Select the codec: Realtek ALC663

  • Check Options -> Show unconnected pins

  • Find Pin ID: 0x16

  • Check Override and select Internal speaker (LFE)

  • Click on Apply now

  • Open sound settings and change your sound mode to Analog Surround 4.0 Output

enter image description here

Test your subwoofer and if it worked, click on install boot override at hdajackretask and reboot your computer.

  • 1
    It works on my N56JR. "Apply now" printed an error so I directly did "install boot override", then rebooted and changed the sound settings. Thanks !
    – XavierBrt
    Commented Sep 15, 2019 at 13:39

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