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[Raymond <178442@xxxxxxxxxxxxxxxxxx>]

do route plugin support rewind if front device need to use route plugin
?

http://git.alsa-project.org/?p=alsa-
lib.git;a=blob;f=src/conf/cards/ICE1712.conf;hb=HEAD


http://git.alsa-project.org/?p=alsa-lib.git;a=blob;f=src/pcm/pcm_route.c;hb=HEAD

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https://bugs.launchpad.net/bugs/178442

Title:
  Pulseaudio fails to initialize ICE1712 chipsets

Status in “alsa-lib” package in Ubuntu:
  Fix Released
Status in “pulseaudio” package in Ubuntu:
  Confirmed
Status in “alsa-lib” source package in Lucid:
  Won't Fix
Status in “pulseaudio” source package in Lucid:
  Triaged

Bug description:
  Binary package hint: pulseaudio

  I have a problem that makes pulseaudio unusable for me.
  I noticed the only device listed by pulseaudio is my webcam (as an input device obviously), so I tried starting pulseaudio from the command line to see what was happening.
  This resulted in:
  "ALSA lib confmisc.c:1286:(snd_func_refer) Unable to find definition 'cards.ICE1712.pcm.surround71.0:CARD=0'
  ALSA lib conf.c:3510:(_snd_config_evaluate) function snd_func_refer returned error: No such file or directory
  ALSA lib conf.c:3982:(snd_config_expand) Evaluate error: No such file or directory
  ALSA lib pcm.c:2145:(snd_pcm_open_noupdate) Unknown PCM surround71:0
  W: alsa-util.c: Device hw:0 doesn't support 2 channels, changed to 10.
  W: alsa-util.c: Device hw:0 doesn't support sample format s16le, changed to s32le.
  W: alsa-util.c: Cannot find fallback mixer control "PCM".
  E: module-alsa-sink.c: Failed to create sink object
  E: module.c: Failed to load  module "module-alsa-sink" (argument: "device_id=0 sink_name=alsa_output.pci_1412_1712_sound_card_0_alsa_playback_0"): initialization failed.ALSA lib confmisc.c:1286:(snd_func_refer) Unable to find definition 'cards.ICE1712.pcm.surround71.0:CARD=0'
  ALSA lib conf.c:3510:(_snd_config_evaluate) function snd_func_refer returned error: No such file or directory
  ALSA lib conf.c:3982:(snd_config_expand) Evaluate error: No such file or directory
  ALSA lib pcm.c:2145:(snd_pcm_open_noupdate) Unknown PCM surround71:0
  W: alsa-util.c: Device hw:0 doesn't support 2 channels, changed to 12.
  W: alsa-util.c: Device hw:0 doesn't support sample format s16le, changed to s32le.
  W: alsa-util.c: Cannot find fallback mixer control "Mic".
  E: module-alsa-source.c: Failed to create source object
  E: module.c: Failed to load  module "module-alsa-source" (argument: "device_id=0 source_name=alsa_input.pci_1412_1712_sound_card_0_alsa_capture_0"): initialization failed."

  This is an up to date Hardy installation.
  Soundcard is a M-Audio Audiophile 2496.

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