51.446|   2.302) D: [pulseaudio] module-suspend-on-idle.c: Sink 
alsa_output.pci-0000_00_1b.0.analog-stereo becomes idle, timeout in 5 seconds.
(  51.446|   0.000) D: [alsa-sink-ALC1150 Analog] sink-input.c: Have to rewind 
15840 bytes on render memblockq.
(  51.446|   0.000) D: [alsa-sink-ALC1150 Analog] sink-input.c: Have to rewind 
31680 bytes on implementor.
(  51.446|   0.000) D: [alsa-sink-ALC1150 Analog] alsa-sink.c: hwbuf_unused=0
(  51.446|   0.000) D: [alsa-sink-ALC1150 Analog] alsa-sink.c: setting 
avail_min=15502
(  51.446|   0.000) D: [alsa-sink-ALC1150 Analog] sink.c: Requesting rewind due 
to started move
(  51.446|   0.000) D: [alsa-sink-ALC1150 Analog] alsa-sink.c: Requested 
volume: 0:  55% 1:  55%
(  51.446|   0.000) D: [alsa-sink-ALC1150 Analog] alsa-sink.c:            in 
dB: 0: -15,75 dB 1: -15,75 dB
(  51.446|   0.000) D: [alsa-sink-ALC1150 Analog] alsa-sink.c: Got hardware 
volume: 0:  55% 1:  55%
(  51.446|   0.000) D: [alsa-sink-ALC1150 Analog] alsa-sink.c:               in 
dB: 0: -15,60 dB 1: -15,60 dB
(  51.446|   0.000) D: [alsa-sink-ALC1150 Analog] alsa-sink.c: Calculated 
software volume: 0:  99% 1:  99% (accurate-enough=yes)
(  51.446|   0.000) D: [alsa-sink-ALC1150 Analog] alsa-sink.c:                  
    in dB: 0: -0,15 dB 1: -0,15 dB
(  51.446|   0.000) D: [alsa-sink-ALC1150 Analog] sink.c: Volume not changing
(  51.446|   0.000) D: [alsa-sink-ALC1150 Analog] alsa-sink.c: Requested to 
rewind 65536 bytes.
(  51.446|   0.000) D: [alsa-sink-ALC1150 Analog] alsa-sink.c: Limited to 15428 
bytes.
(  51.446|   0.000) D: [alsa-sink-ALC1150 Analog] alsa-sink.c: before: 3857
(  51.446|   0.000) D: [alsa-sink-ALC1150 Analog] alsa-sink.c: after: 3857
(  51.446|   0.000) D: [alsa-sink-ALC1150 Analog] alsa-sink.c: Rewound 15428 
bytes.
(  51.446|   0.000) D: [alsa-sink-ALC1150 Analog] sink.c: Processing rewind...
(  51.446|   0.000) D: [alsa-sink-ALC1150 Analog] sink.c: latency = 1937
(  51.446|   0.000) D: [alsa-sink-ALC1150 Analog] source.c: Processing rewind...
(  51.446|   0.000) D: [pulseaudio] module-suspend-on-idle.c: Sink 
alsa_output.pci-0000_00_1b.0.analog-stereo becomes idle, timeout in 5 seconds.
(  51.446|   0.000) D: [pulseaudio] module-rescue-streams.c: No sink inputs to 
move away.
(  51.446|   0.000) D: [pulseaudio] module-rescue-streams.c: No source outputs 
to move away.
(  51.446|   0.000) D: [pulseaudio] core-subscribe.c: Dropped redundant event 
due to remove event.
(  51.446|   0.000) D: [alsa-sink-ALC1150 Analog] alsa-sink.c: Thread shutting 
down
(  51.447|   0.000) I: [pulseaudio] sink.c: Freeing sink 3 
"alsa_output.pci-0000_00_1b.0.analog-stereo"
(  51.447|   0.000) I: [pulseaudio] source.c: Freeing source 4 
"alsa_output.pci-0000_00_1b.0.analog-stereo.monitor"
(  51.447|   0.000) D: [pulseaudio] module-rescue-streams.c: No source outputs 
to move away.
(  51.447|   0.000) D: [alsa-source-ALC1150 Analog] alsa-source.c: Thread 
shutting down
(  51.447|   0.000) I: [pulseaudio] source.c: Freeing source 5 
"alsa_input.pci-0000_00_1b.0.analog-stereo"
(  51.448|   0.001) D: [pulseaudio] reserve-wrap.c: Successfully acquired 
reservation lock on device 'Audio0'
(  51.449|   0.000) D: [pulseaudio] reserve-wrap.c: Successfully create 
reservation lock monitor for device 'Audio0'
(  51.449|   0.000) D: [pulseaudio] alsa-util.c: Trying surround51:0 with 
SND_PCM_NO_AUTO_FORMAT ...
(  51.449|   0.000) D: [pulseaudio] alsa-util.c: Managed to open surround51:0
(  51.449|   0.000) I: [pulseaudio] alsa-util.c: Trying to disable ALSA period 
wakeups, using timers only
(  51.449|   0.000) D: [pulseaudio] alsa-util.c: Maximum hw buffer size is 123 
ms
(  51.449|   0.000) I: [pulseaudio] alsa-util.c: 
snd_pcm_hw_params_set_buffer_size_near() failed: Invalid argument
(  51.449|   0.000) I: [pulseaudio] alsa-util.c: 
snd_pcm_hw_params_set_period_size_near() failed: Invalid argument
(  51.449|   0.000) I: [pulseaudio] alsa-util.c: 
snd_pcm_hw_params_set_buffer_size_near() failed: Invalid argument
(  51.480|   0.030) D: [pulseaudio] alsa-util.c: Set only period size (to 88200 
samples).
(  51.480|   0.000) I: [pulseaudio] alsa-util.c: ALSA period wakeups disabled
(  51.480|   0.000) I: [pulseaudio] alsa-sink.c: Successfully opened device 
surround51:0.


strange that 


51.449|   0.000) I: [pulseaudio] alsa-util.c: 
snd_pcm_hw_params_set_buffer_size_near() failed: Invalid argument
(  51.449|   0.000) I: [pulseaudio] alsa-util.c: 
snd_pcm_hw_params_set_period_size_near() failed: Invalid argument
(  51.449|   0.000) I: [pulseaudio] alsa-util.c: 
snd_pcm_hw_params_set_buffer_size_near() failed: Invalid argument

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https://bugs.launchpad.net/bugs/1445861

Title:
  Subwoofer drops out when playback ends

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