Ubuntu 15.10/16.04 – Swap center und bass/LFE on 5.1 audio output

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I’m using an USB sound card on my laptop, because due to missing audio jacks I can’t connect them directly to it. The sound card is recognized by Ubuntu 15.10 or 16.04 as „CM106 Like Sound Device“. The problem ist that the center- and bass/LFE-speakers are swapped. I know that this wasn’t so in Ubuntu 15.04.

To get them in the right order again you open your terminal and open the file under /usr/share/pulseaudio/alsa-mixer/profile-sets/default.conf as root. In there you can find the following config block:

[Mapping analog-surround-51]
device-strings = surround51:%f
channel-map = front-left,front-right,rear-left,rear-right,front-center,lfe
paths-output = analog-output analog-output-lineout analog-output-speaker
priority = 8
direction = output

This is the standard profile for 5.1 output. In the GUI this is used when „Analog Surround 5.1 Output“ is selected. To change center- and bass/LFE-speakers you adjust the channel-map line like the following:

[Mapping analog-surround-51]
device-strings = surround51:%f
channel-map = front-left,front-right,rear-left,rear-right,lfe,front-center
paths-output = analog-output analog-output-lineout analog-output-speaker
priority = 8
direction = output

After a reboot the new settings should apply. Or you can just kill the pulse audio daemon:

:~$ killall pulseaudio

I would not use the GUI tool to check the bass/LFE-Speaker, because the sampe doesn’t sound so. If you don’t have a good sample you can search on YouTube for bass bosted music to check you config. If you speaker or headset isn’t shaking now it’s probably broken.


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