Also, when CPU is loaded for any reason I sometimes get this:

Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] 
protocol-native.c: Implicit underrun of 'Playback'
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] sink.c: Found 
underrun 1380 bytes ago (1436 bytes ahead in playback buffer)
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] 
protocol-native.c: Requesting rewind due to end of underrun.
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] alsa-sink.c: 
Requested to rewind 2816 bytes.
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] alsa-sink.c: 
Limited to 2560 bytes.
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] alsa-sink.c: 
before: 640
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] alsa-sink.c: 
after: 640
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] alsa-sink.c: 
Rewound 2560 bytes.
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] sink.c: 
Processing rewind...
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] sink.c: 
latency = 1302
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] sink-input.c: 
Have to rewind 2560 bytes on render memblockq.
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] source.c: 
Processing rewind...
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] alsa-util.c: 
snd_pcm_avail() returned a value that is exceptionally large: 32960 bytes (186 
ms).
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] alsa-util.c: 
Most likely this is a bug in the ALSA driver 'snd_hda_intel'. Please report 
this issue to the ALSA developers.
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] alsa-util.c: 
snd_pcm_dump():
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] alsa-util.c: 
Soft volume PCM
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] alsa-util.c: 
Control: PCM Playback Volume
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] alsa-util.c: 
min_dB: -51
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] alsa-util.c: 
max_dB: 0
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] alsa-util.c: 
resolution: 256
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] alsa-util.c: 
Its setup is:
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] alsa-util.c:  
 stream       : PLAYBACK
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] alsa-util.c:  
 access       : MMAP_INTERLEAVED
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] alsa-util.c:  
 format       : S16_LE
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] alsa-util.c:  
 subformat    : STD
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] alsa-util.c:  
 channels     : 2
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] alsa-util.c:  
 rate         : 44100
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] alsa-util.c:  
 exact rate   : 44100 (44100/1)
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] alsa-util.c:  
 msbits       : 16
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] alsa-util.c:  
 buffer_size  : 704
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] alsa-util.c:  
 period_size  : 352
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] alsa-util.c:  
 period_time  : 7981
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] alsa-util.c:  
 tstamp_mode  : ENABLE
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] alsa-util.c:  
 period_step  : 1
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] alsa-util.c:  
 avail_min    : 352
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] alsa-util.c:  
 period_event : 1
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] alsa-util.c:  
 start_threshold  : -1
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] alsa-util.c:  
 stop_threshold   : 6341068275337658368
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] alsa-util.c:  
 silence_threshold: 0
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] alsa-util.c:  
 silence_size : 0
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] alsa-util.c:  
 boundary     : 6341068275337658368
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] alsa-util.c: 
Slave: Hardware PCM card 0 'HDA Intel PCH' device 0 subdevice 0
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] alsa-util.c: 
Its setup is:
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] alsa-util.c:  
 stream       : PLAYBACK
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] alsa-util.c:  
 access       : MMAP_INTERLEAVED
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] alsa-util.c:  
 format       : S16_LE
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] alsa-util.c:  
 subformat    : STD
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] alsa-util.c:  
 channels     : 2
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] alsa-util.c:  
 rate         : 44100
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] alsa-util.c:  
 exact rate   : 44100 (44100/1)
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] alsa-util.c:  
 msbits       : 16
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] alsa-util.c:  
 buffer_size  : 704
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] alsa-util.c:  
 period_size  : 352
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] alsa-util.c:  
 period_time  : 7981
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] alsa-util.c:  
 tstamp_mode  : ENABLE
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] alsa-util.c:  
 period_step  : 1
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] alsa-util.c:  
 avail_min    : 352
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] alsa-util.c:  
 period_event : 1
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] alsa-util.c:  
 start_threshold  : -1
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] alsa-util.c:  
 stop_threshold   : 6341068275337658368
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] alsa-util.c:  
 silence_threshold: 0
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] alsa-util.c:  
 silence_size : 0
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] alsa-util.c:  
 boundary     : 6341068275337658368
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] alsa-util.c:  
 appl_ptr     : 80123792
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] alsa-util.c:  
 hw_ptr       : 80135633
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] 
protocol-native.c: Implicit underrun of 'Playback'
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] alsa-util.c: 
snd_pcm_delay() returned a value that is exceptionally large: -41248 bytes 
(-233 ms).
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] alsa-util.c: 
Most likely this is a bug in the ALSA driver 'snd_hda_intel'. Please report 
this issue to the ALSA developers.
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] alsa-util.c: 
snd_pcm_dump():
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] alsa-util.c: 
Soft volume PCM
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] alsa-util.c: 
Control: PCM Playback Volume
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] alsa-util.c: 
min_dB: -51
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] alsa-util.c: 
max_dB: 0
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] alsa-util.c: 
resolution: 256
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] alsa-util.c: 
Its setup is:
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] alsa-util.c:  
 stream       : PLAYBACK
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] alsa-util.c:  
 access       : MMAP_INTERLEAVED
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] alsa-util.c:  
 format       : S16_LE
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] alsa-util.c:  
 subformat    : STD
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] alsa-util.c:  
 channels     : 2
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] alsa-util.c:  
 rate         : 44100
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] alsa-util.c:  
 exact rate   : 44100 (44100/1)
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] alsa-util.c:  
 msbits       : 16
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] alsa-util.c:  
 buffer_size  : 704
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] alsa-util.c:  
 period_size  : 352
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] alsa-util.c:  
 period_time  : 7981
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] alsa-util.c:  
 tstamp_mode  : ENABLE
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] alsa-util.c:  
 period_step  : 1
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] alsa-util.c:  
 avail_min    : 352
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] alsa-util.c:  
 period_event : 1
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] alsa-util.c:  
 start_threshold  : -1
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] alsa-util.c:  
 stop_threshold   : 6341068275337658368
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] alsa-util.c:  
 silence_threshold: 0
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] alsa-util.c:  
 silence_size : 0
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] alsa-util.c:  
 boundary     : 6341068275337658368
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] alsa-util.c: 
Slave: Hardware PCM card 0 'HDA Intel PCH' device 0 subdevice 0
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] alsa-util.c: 
Its setup is:
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] alsa-util.c:  
 stream       : PLAYBACK
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] alsa-util.c:  
 access       : MMAP_INTERLEAVED
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] alsa-util.c:  
 format       : S16_LE
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] alsa-util.c:  
 subformat    : STD
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] alsa-util.c:  
 channels     : 2
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] alsa-util.c:  
 rate         : 44100
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] alsa-util.c:  
 exact rate   : 44100 (44100/1)
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] alsa-util.c:  
 msbits       : 16
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] alsa-util.c:  
 buffer_size  : 704
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] alsa-util.c:  
 period_size  : 352
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] alsa-util.c:  
 period_time  : 7981
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] alsa-util.c:  
 tstamp_mode  : ENABLE
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] alsa-util.c:  
 period_step  : 1
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] alsa-util.c:  
 avail_min    : 352
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] alsa-util.c:  
 period_event : 1
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] alsa-util.c:  
 start_threshold  : -1
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] alsa-util.c:  
 stop_threshold   : 6341068275337658368
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] alsa-util.c:  
 silence_threshold: 0
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] alsa-util.c:  
 silence_size : 0
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] alsa-util.c:  
 boundary     : 6341068275337658368
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] alsa-util.c:  
 appl_ptr     : 80130832
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] alsa-util.c:  
 hw_ptr       : 80141265
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] ratelimit.c: 
14 events suppressed
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] alsa-sink.c: 
Underrun!
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] 
protocol-native.c: Requesting rewind due to end of underrun.
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] alsa-sink.c: 
Requested to rewind 2816 bytes.
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] alsa-sink.c: 
Limited to 2560 bytes.
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] alsa-sink.c: 
before: 640
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] alsa-sink.c: 
after: 640
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] alsa-sink.c: 
Rewound 2560 bytes.
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] sink.c: 
Processing rewind...
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] sink.c: 
latency = 10117
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] sink-input.c: 
Have to rewind 2560 bytes on render memblockq.
Apr 09 11:56:10 work pulseaudio[9718]: [alsa-sink-VT1708S Analog] source.c: 
Processing rewind...

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https://bugs.launchpad.net/bugs/996906

Title:
  periodic audio skips with Intel HDA

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