did you specify period time or buffer time for speaker-test since it use
max buffer size by default

  if (! buffer_time && ! period_time) {
 583     buffer_size = buffer_size_max;
 584     if (! period_time)
 585       buffer_size = (buffer_size / nperiods) * nperiods;
 586     printf(_("Using max buffer size %lu\n"), buffer_size);
 587     err = snd_pcm_hw_params_set_buffer_size_near(handle, params, 
&buffer_size);
 588     if (err < 0) {
 589       fprintf(stderr, _("Unable to set buffer size %lu for playback: 
%s\n"),
 590              buffer_size, snd_strerror(err));
 591       return err;
 592     }

but your log seem requesting low latency instead of Max buffer size


Aug 21 14:30:56 Arbeits-PC pulseaudio[1984]: (  30.215|   0.000) [pulseaudio] 
sink.c: Suspend cause of sink alsa_output.pci-0000_00_1b.0.analog-stereo is 
0x0000, resuming
Aug 21 14:30:56 Arbeits-PC pulseaudio[1984]: (  30.216|   0.000) [pulseaudio] 
reserve-wrap.c: Successfully acquired reservation lock on device 'Audio0'
Aug 21 14:30:56 Arbeits-PC pulseaudio[1984]: (  30.216|   0.000) 
[alsa-sink-ALC889 Analog] alsa-sink.c: Trying resume...
Aug 21 14:30:56 Arbeits-PC pulseaudio[1984]: (  30.216|   0.000) 
[alsa-sink-ALC889 Analog] alsa-util.c: Trying to disable ALSA period wakeups, 
using timers only
Aug 21 14:30:56 Arbeits-PC pulseaudio[1984]: (  30.217|   0.000) 
[alsa-sink-ALC889 Analog] alsa-util.c: Maximum hw buffer size is 341 ms
Aug 21 14:30:56 Arbeits-PC pulseaudio[1984]: (  30.217|   0.000) 
[alsa-sink-ALC889 Analog] alsa-util.c: Set buffer size first (to 16384 
samples), period size second (to 8192 samples).
Aug 21 14:30:56 Arbeits-PC pulseaudio[1984]: (  30.217|   0.000) 
[alsa-sink-ALC889 Analog] alsa-util.c: ALSA period wakeups disabled
Aug 21 14:30:56 Arbeits-PC pulseaudio[1984]: (  30.217|   0.000) 
[alsa-sink-ALC889 Analog] alsa-sink.c: hwbuf_unused=0
Aug 21 14:30:56 Arbeits-PC pulseaudio[1984]: (  30.217|   0.000) 
[alsa-sink-ALC889 Analog] alsa-sink.c: setting avail_min=15502
Aug 21 14:30:56 Arbeits-PC pulseaudio[1984]: (  30.217|   0.000) 
[alsa-sink-ALC889 Analog] alsa-sink.c: Time scheduling watermark is 18,38ms
Aug 21 14:30:56 Arbeits-PC pulseaudio[1984]: (  30.217|   0.000) 
[alsa-sink-ALC889 Analog] alsa-sink.c: Resumed successfully...
Aug 21 14:30:56 Arbeits-PC pulseaudio[1984]: (  30.217|   0.000) [pulseaudio] 
module-suspend-on-idle.c: Sink alsa_output.pci-0000_00_1b.0.analog-stereo 
becomes idle, timeout in 5 seconds.
Aug 21 14:30:56 Arbeits-PC pulseaudio[1984]: (  30.217|   0.000) 
[alsa-sink-ALC889 Analog] alsa-sink.c: Starting playback.
Aug 21 14:30:56 Arbeits-PC pulseaudio[1984]: (  30.217|   0.000) 
[alsa-sink-ALC889 Analog] ratelimit.c: 203 events suppressed
Aug 21 14:30:56 Arbeits-PC pulseaudio[1984]: (  30.217|   0.000) 
[alsa-sink-ALC889 Analog] alsa-sink.c: Cutting sleep time for the initial 
iterations by half.
Aug 21 14:30:56 Arbeits-PC pulseaudio[1984]: (  30.217|   0.000) 
[alsa-sink-ALC889 Analog] alsa-sink.c: Cutting sleep time for the initial 
iterations by half.
Aug 21 14:30:56 Arbeits-PC pulseaudio[1984]: (  30.218|   0.000) [pulseaudio] 
module-suspend-on-idle.c: Sink alsa_output.pci-0000_00_1b.0.analog-stereo 
becomes idle, timeout in 5 seconds.
Aug 21 14:30:56 Arbeits-PC pulseaudio[1984]: (  30.218|   0.000) [pulseaudio] 
memblockq.c: memblockq requested: maxlength=33554432, tlength=0, base=4, 
prebuf=0, minreq=1 maxrewind=0
Aug 21 14:30:56 Arbeits-PC pulseaudio[1984]: (  30.218|   0.000) [pulseaudio] 
memblockq.c: memblockq sanitized: maxlength=33554432, tlength=33554432, base=4, 
prebuf=0, minreq=4 maxrewind=0
Aug 21 14:30:56 Arbeits-PC pulseaudio[1984]: (  30.218|   0.000) [pulseaudio] 
sink-input.c: Created input 4460 "ALSA Playback" on 
alsa_output.pci-0000_00_1b.0.analog-stereo with sample spec s16le 2ch 48000Hz 
and channel map front-left,front-right
Aug 21 14:30:56 Arbeits-PC pulseaudio[1984]: (  30.218|   0.000) [pulseaudio] 
sink-input.c:     media.name = "ALSA Playback"
Aug 21 14:30:56 Arbeits-PC pulseaudio[1984]: (  30.218|   0.000) [pulseaudio] 
sink-input.c:     application.name = "ALSA plug-in [speaker-test]"
Aug 21 14:30:56 Arbeits-PC pulseaudio[1984]: (  30.218|   0.000) [pulseaudio] 
sink-input.c:     native-protocol.peer = "UNIX socket client"
Aug 21 14:30:56 Arbeits-PC pulseaudio[1984]: (  30.218|   0.000) [pulseaudio] 
sink-input.c:     native-protocol.version = "28"
Aug 21 14:30:56 Arbeits-PC pulseaudio[1984]: (  30.218|   0.000) [pulseaudio] 
sink-input.c:     application.process.id = "31663"
Aug 21 14:30:56 Arbeits-PC pulseaudio[1984]: (  30.218|   0.000) [pulseaudio] 
sink-input.c:     application.process.user = "vincent"
Aug 21 14:30:56 Arbeits-PC pulseaudio[1984]: (  30.218|   0.000) [pulseaudio] 
sink-input.c:     application.process.host = "Arbeits-PC"
Aug 21 14:30:56 Arbeits-PC pulseaudio[1984]: (  30.218|   0.000) [pulseaudio] 
sink-input.c:     application.process.binary = "speaker-test"
Aug 21 14:30:56 Arbeits-PC pulseaudio[1984]: (  30.218|   0.000) [pulseaudio] 
sink-input.c:     application.language = "C"
Aug 21 14:30:56 Arbeits-PC pulseaudio[1984]: (  30.218|   0.000) [pulseaudio] 
sink-input.c:     window.x11.display = ":0"
Aug 21 14:30:56 Arbeits-PC pulseaudio[1984]: (  30.218|   0.000) [pulseaudio] 
sink-input.c:     application.process.machine_id = 
"41ed86f4d975992452812da453ebb83b"
Aug 21 14:30:56 Arbeits-PC pulseaudio[1984]: (  30.218|   0.000) [pulseaudio] 
sink-input.c:     application.process.session_id = "c2"
Aug 21 14:30:56 Arbeits-PC pulseaudio[1984]: (  30.218|   0.000) [pulseaudio] 
sink-input.c:     module-stream-restore.id = 
"sink-input-by-application-name:ALSA plug-in [speaker-test]"
Aug 21 14:30:56 Arbeits-PC pulseaudio[1984]: (  30.218|   0.000) [pulseaudio] 
protocol-native.c: Requested tlength=100,00 ms, minreq=25,00 ms
Aug 21 14:30:56 Arbeits-PC pulseaudio[1984]: (  30.218|   0.000) [pulseaudio] 
protocol-native.c: Early requests mode enabled, configuring sink latency to 
minreq.

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https://bugs.launchpad.net/bugs/1359729

Title:
  [System Product Name, Realtek ALC889, Green Headphone Out, Front]
  Underruns, dropouts or crackling sound

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