: [alsa-source-ALC663 Analog] alsa-util.c: Trying to disable ALSA period wakeups, using timers only
D: [alsa-source-ALC663 Analog] alsa-util.c: Maximum hw buffer size is 371 ms
D: [alsa-source-ALC663 Analog] alsa-util.c: Set buffer size first (to 16384 samples), period size second (to 8192 samples).
I: [alsa-source-ALC663 Analog] alsa-util.c: ALSA period wakeups disabled
D: [alsa-source-ALC663 Analog] alsa-source.c: hwbuf_unused=0
D: [alsa-source-ALC663 Analog] alsa-source.c: setting avail_min=15502
D: [alsa-source-ALC663 Analog] alsa-source.c: hwbuf_unused=0
D: [alsa-source-ALC663 Analog] alsa-source.c: setting avail_min=15502
I: [alsa-source-ALC663 Analog] alsa-source.c: Time scheduling watermark is 20.00ms
I: [alsa-source-ALC663 Analog] alsa-source.c: Resumed successfully...
I: [alsa-source-ALC663 Analog] alsa-source.c: Starting capture.

D: [pulseaudio] module-suspend-on-idle.c: Source alsa_input.pci-0000_00_0f.0.analog-stereo becomes idle, timeout in 5 seconds.
D: [pulseaudio] core-subscribe.c: Dropped redundant event due to change event.
D: [pulseaudio] memblockq.c: memblockq requested: maxlength=33554432, tlength=0, base=4, prebuf=0, minreq=1 maxrewind=0
D: [pulseaudio] memblockq.c: memblockq sanitized: maxlength=33554432, tlength=33554432, base=4, prebuf=0, minreq=4 maxrewind=0
I: [pulseaudio] source-output.c: Created output 17 "ALSA Capture" on alsa_input.pci-0000_00_0f.0.analog-stereo with sample spec s16le 2ch 44100Hz and channel map front-left,front-right
I: [pulseaudio] source-output.c:     media.name = "ALSA Capture"
I: [pulseaudio] source-output.c:     application.name = "ALSA plug-in [audacity]"
I: [pulseaudio] source-output.c:     native-protocol.peer = "UNIX socket client"
I: [pulseaudio] source-output.c:     native-protocol.version = "28"
I: [pulseaudio] source-output.c:     application.process.id = "28751"
I: [pulseaudio] source-output.c:     application.process.user = "martin"
I: [pulseaudio] source-output.c:     application.process.host = "martin-N90SV"
I: [pulseaudio] source-output.c:     application.process.binary = "audacity"
I: [pulseaudio] source-output.c:     application.language = "de_AT.UTF-8"
I: [pulseaudio] source-output.c:     window.x11.display = ":0"
I: [pulseaudio] source-output.c:     application.process.machine_id = "b1897efd1271d7193610a64c51750c4a"
I: [pulseaudio] source-output.c:     application.process.session_id = "c3"
I: [pulseaudio] source-output.c:     application.icon_name = "audacity"
I: [pulseaudio] source-output.c:     module-stream-restore.id = "source-output-by-application-name:ALSA plug-in [audacity]"
D: [pulseaudio] memblockq.c: memblockq requested: maxlength=4194304, tlength=0, base=4, prebuf=1, minreq=0 maxrewind=0
D: [pulseaudio] memblockq.c: memblockq sanitized: maxlength=4194304, tlength=4194304, base=4, prebuf=4, minreq=4 maxrewind=0
I: [pulseaudio] protocol-native.c: Final latency 60.00 ms = 30.00 ms + 30.00 ms
D: [alsa-source-ALC663 Analog] alsa-source.c: latency set to 30.00ms
D: [alsa-source-ALC663 Analog] alsa-source.c: hwbuf_unused=60244
D: [alsa-source-ALC663 Analog] alsa-source.c: setting avail_min=442
D: [alsa-source-ALC663 Analog] alsa-source.c: latency set to 30.00ms
D: [alsa-source-ALC663 Analog] alsa-source.c: hwbuf_unused=60244
D: [alsa-source-ALC663 Analog] alsa-source.c: setting avail_min=442



D: [alsa-source-ALC663 Analog] source.c: Volume not changing
D: [pulseaudio] core-subscribe.c: Dropped redundant event due to change event.
D: [pulseaudio] module-udev-detect.c: /dev/snd/controlC0 is accessible: yes
D: [pulseaudio] module-udev-detect.c: Resuming all sinks and sources of card alsa_card.pci-0000_00_0f.0.
D: [alsa-source-ALC663 Analog] alsa-source.c: hwbuf_unused=0

hwbuf_unused = 0 mean all 371ms buffer are used if it still use 20ms sleep time, pulseaudio sleep 351 ms but audicty expect pulseaudio return audio for every 30ms