Created attachment 113034
Underruns in the log

Same with VIA VT1708S. When I start pavucontrol it skips hardly and almost 
stops sometimes. Because of that latency increases and may get up to 80 ms 
which is unacceptable as PulseAudio's goal is to provide low latency audio. Of 
course, it doesn't happen with pure ALSA. I already set all priorities to the 
maximum, doesn't seem to help. My kernel is preemptive (not the default 
Debian's one, it's even worse with it):
Linux work 3.18.0-pf0+ #1 SMP PREEMPT Tue Jan 13 09:21:17 MSK 2015 x86_64 
GNU/Linux

I have this enabled in daemon.conf:
high-priority = yes
nice-level = -19
realtime-scheduling = yes
realtime-priority = 15
exit-idle-time = -1
log-level = debug

This doesn't happen with tsched=0, but the resulting latency is horrible
in that case. Pure ALSA has negligible latency and doesn't skip at all.

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

Title:
  periodic audio skips with Intel HDA

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