5.1 Surround on Ubuntu 14.04 with ALC888

First install a few programs and drivers
sudo apt-get install pavucontrol libasound2-plugins-extra liba52-0.7.4

Add the file /usr/share/alsa/alsa.conf.d/a52.conf
Add
>>
pcm.a52 {
  @args [CARD]
  @args.CARD {
    type string
  }
  type rate
  slave {
    pcm {
      type a52
      bitrate 448
      channels 6
      card $CARD
    }
  rate 48000 #required somehow, otherwise nothing happens in PulseAudio
  }
}
<<

Testing: run in terminal speaker-test -c 6

I later added to /etc/modprobe.d/alsa-base.conf
>>
options snd-hda-intel model=6stack-dig
<<


Notes:

I tried changing /etc/pulse/daemon.conf and setting the following config without success
>>
default-sample-rate = 48000
default-sample-channels = 6
default-channel-map = front-left,front-right,front-center,rear-left,rear-right,lfe
<<

Help found on:
https://help.ubuntu.com/community/DigitalAC-3Pulseaudio
http://ubuntuforums.org/showthread.php?t=2064526
http://ubuntuforums.org/showthread.php?t=1043568

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