http://mailman.alsa-project.org/pipermail/alsa-
devel/2008-October/011913.html

: module-alsa-sink.c: Using 4 fragments of size 8816 bytes, buffer time is 
99.95ms
D: module-alsa-sink.c: hwbuf_unused_frames=0
D: module-alsa-sink.c: setting avail_min=1
I: module-alsa-sink.c: Volume ranges from 0 to 31.
I: module-alsa-sink.c: Volume ranges from -46.50 dB to 0.00 dB.
I: alsa-util.c: ALSA device lacks separate volumes control for channel 
'rear-left'
I: module-alsa-sink.c: Using hardware volume control. Hardware dB scale 
supported.
D: alsa-util.c: snd_pcm_dump():
D: alsa-util.c: Multi PCM
D: alsa-util.c:   Channel bindings:
D: alsa-util.c:     0: slave 0, channel 0
D: alsa-util.c:     1: slave 0, channel 1
D: alsa-util.c:     2: slave 1, channel 0
D: alsa-util.c:     3: slave 1, channel 1
D: alsa-util.c: Its setup is:
D: alsa-util.c:   stream       : PLAYBACK
D: alsa-util.c:   access       : RW_INTERLEAVED
D: alsa-util.c:   format       : S16_LE
D: alsa-util.c:   subformat    : STD
D: alsa-util.c:   channels     : 4
D: alsa-util.c:   rate         : 44100
D: alsa-util.c:   exact rate   : 44100 (44100/1)
D: alsa-util.c:   msbits       : 16
D: alsa-util.c:   buffer_size  : 4408
D: alsa-util.c:   period_size  : 1102
D: alsa-util.c:   period_time  : 24988
D: alsa-util.c:   tstamp_mode  : NONE
D: alsa-util.c:   period_step  : 1
D: alsa-util.c:   avail_min    : 1102
D: alsa-util.c:   period_event : 0
D: alsa-util.c:   start_threshold  : -1
D: alsa-util.c:   stop_threshold   : -1
D: alsa-util.c:   silence_threshold: 0
D: alsa-util.c:   silence_size : 0
D: alsa-util.c:   boundary     : 1155530752
D: alsa-util.c: Slave #0: Hooks PCM
D: alsa-util.c: Its setup is:
D: alsa-util.c:   stream       : PLAYBACK
D: alsa-util.c:   access       : MMAP_INTERLEAVED
D: alsa-util.c:   format       : S16_LE
D: alsa-util.c:   subformat    : STD
D: alsa-util.c:   channels     : 2
D: alsa-util.c:   rate         : 44100
D: alsa-util.c:   exact rate   : 44100 (44100/1)
D: alsa-util.c:   msbits       : 16
D: alsa-util.c:   buffer_size  : 4408
D: alsa-util.c:   period_size  : 1102
D: alsa-util.c:   period_time  : 24988
D: alsa-util.c:   tstamp_mode  : NONE
D: alsa-util.c:   period_step  : 1
D: alsa-util.c:   avail_min    : 1102
D: alsa-util.c:   period_event : 0
D: alsa-util.c:   start_thr
D: module-alsa-sink.c: Thread starting up
D: rtpoll.c: Acquired POSIX realtime signal SIGRTMIN+29
D: module-alsa-sink.c: Read hardware volume: 0:  87% 1:  87% 2:  87% 3:  87%
I: module-alsa-sink.c: Starting playback.
I: (alsa-lib)pcm_hw.c: SNDRV_PCM_IOCTL_START failed


the playback stream has been started and pcm state is running but pulseaudio 
still call snd_pcm_start()

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https://bugs.launchpad.net/bugs/1315212

Title:
  [CA0106 - CA0106, playback] Playback problem - Surround dies, no valid
  output

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