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[Raymond <1286021@xxxxxxxxxxxxxxxxxx>]

https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/871808

https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/1040873

those Asus laptop only use alc663 codec , as one of the volume control
is used by headphone and it won't support 5.1


https://bugzilla.kernel.org/show_bug.cgi?id=65091

http://www.asus.com/Notebooks_Ultrabooks/N550JV/


New N Series laptops are the first with a quad-speaker array.
And for deep bass, you get the bundled external SonicMaster subwoofer,

** Bug watch added: Linux Kernel Bug Tracker #65091
   http://bugzilla.kernel.org/show_bug.cgi?id=65091

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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

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