I'm still in 12.04 with this soundcard:

# lspci | grep "Audio" 
00:1b.0 Audio device: Intel Corporation 82801I (ICH9 Family) HD Audio 
Controller (rev 03)

Bit from /var/log/syslog:

Nov 10 10:20:08 quadrio pulseaudio[19484]: [alsa-sink] alsa-sink.c: setting 
avail_min=11711
Nov 10 10:20:08 quadrio pulseaudio[19484]: [alsa-sink] protocol-native.c: 
max_request changed, trying to update from 59904 to 63744.
Nov 10 10:20:08 quadrio pulseaudio[19484]: [alsa-sink] protocol-native.c: 
Notifying client about increased tlength
Nov 10 10:20:08 quadrio pulseaudio[19484]: [alsa-sink] alsa-sink.c: Latency set 
to 126.00ms
Nov 10 10:20:08 quadrio pulseaudio[19484]: [alsa-sink] alsa-sink.c: 
hwbuf_unused=43312
Nov 10 10:20:08 quadrio pulseaudio[19484]: [alsa-sink] alsa-sink.c: setting 
avail_min=11711
Nov 10 10:20:37 quadrio pulseaudio[19484]: [alsa-sink] alsa-sink.c: Decreasing 
wakeup watermark to 101.00 ms
Nov 10 10:21:06 quadrio pulseaudio[19484]: [alsa-sink] alsa-sink.c: Underrun!
Nov 10 10:21:06 quadrio pulseaudio[19484]: [alsa-sink] alsa-sink.c: Increasing 
wakeup watermark to 111.00 ms
Nov 10 10:21:26 quadrio pulseaudio[19484]: [alsa-sink] alsa-sink.c: Decreasing 
wakeup watermark to 106.01 ms

I'm on a 32-bit system with 8GB of memory, so run PAE.

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

Title:
  periodic audio skips with Intel HDA

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