https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/1316305

do you mean surround21 not yet available in Ubuntu 14.04 LTS ?


Profili:
                input:analog-stereo: Stereo analogico input (sinks: 0, sources: 
1, priority. 60)
                output:analog-stereo: Stereo analogico output (sinks: 1, 
sources: 0, priority. 6000)
                output:analog-stereo+input:analog-stereo: Duplex stereo 
analogico (sinks: 1, sources: 1, priority. 6060)
                output:analog-surround-40: Surround analogico 4.0 output 
(sinks: 1, sources: 0, priority. 700)
                output:analog-surround-40+input:analog-stereo: Surround 
analogico 4.0 output + Stereo analogico input (sinks: 1, sources: 1, priority. 
760)
                output:analog-surround-21: Surround analogico 2.1 output 
(sinks: 1, sources: 0, priority. 800)
                output:analog-surround-21+input:analog-stereo: Surround 
analogico 2.1 output + Stereo analogico input (sinks: 1, sources: 1, priority. 
860)
                off: Spento (sinks: 0, sources: 0, priority. 0)
        Profilo attivo: output:analog-surround-21+input:analog-stereo


http://www.maxx.com/asus/

refer to those user guides,  look like bass is done by software instead
of hardware as user can specify cutoff frequency

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https://bugs.launchpad.net/bugs/1286021

Title:
  2.1 surround support (userspace)

Status in “alsa-lib” package in Ubuntu:
  Fix Committed
Status in “pulseaudio” package in Ubuntu:
  In Progress

Bug description:
  2.1 surround should work as seamlessly as other surround options, such
  as 4.0, 5.1 and 7.1 work today.

  Alsa-lib and pulseaudio patches for 14.04 can be tested here:

  https://launchpad.net/~diwic/+archive/surround21

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/alsa-lib/+bug/1286021/+subscriptions

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