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[Raymond <1390474@xxxxxxxxxxxxxxxxxx>]

https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/1402052


seem usb audio devices build the multi volume control in the same way

so you should file an up stream pulseaudio bug report for usb audio
device

have you ask Arun how to revert his patch ?

https://bugs.freedesktop.org/enter_bug.cgi?product=PulseAudio

Simple mixer control 'Speaker',0
   Capabilities: pvolume pswitch pswitch-joined penum
   Playback channels: Front Left - Front Right - Rear Left - Rear Right - Front Center - Woofer - Side Left - Side Right
   Limits: Playback 0 - 197
   Mono:
   Front Left: Playback 90 [46%] [-20.06dB] [on]
   Front Right: Playback 90 [46%] [-20.06dB] [on]
   Rear Left: Playback 90 [46%] [-20.06dB] [on]
   Rear Right: Playback 90 [46%] [-20.06dB] [on]
   Front Center: Playback 90 [46%] [-20.06dB] [on]
   Woofer: Playback 90 [46%] [-20.06dB] [on]
   Side Left: Playback 90 [46%] [-20.06dB] [on]
   Side Right: Playback 90 [46%] [-20.06dB] [on]

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https://bugs.launchpad.net/bugs/1390474

Title:
  "Volume element PCM has 6 channels. That's too much!" with Terratec
  PHASE26

Status in pulseaudio package in Ubuntu:
  Incomplete

Bug description:
  When connecting the Terratec PHASE26 in 16/48 mode (6 channels) I get the error "Volume element PCM has 6 channels. That's too much! I can't handle that!"  and the card fails to show up in Sound Settings.
  Everything is fine with 24/48 mode (2 channels).

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