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[Raymond <1286021@xxxxxxxxxxxxxxxxxx>]

>However, this will just add Surround 2.1 support for stuff that already
is 2.1 in source material (well, 5.1 will be downmixed to 2.1, but
normal stereo will not be upmixed, so no sound will be heard on the
subwoofer).

Does it mean that test with 5.1 downmix to surround21 ?

speaker-test -c6 -t wav -d -D pulse

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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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