Bluetooth audio underruns, dropouts or crackling sound

[Simo Cocco]

The audio isn't in sync with video (ex. with youtube).
Sometimes the audio is missing

ProblemType: Bug
DistroRelease: Ubuntu 20.10
Package: pulseaudio 1:13.99.2-1ubuntu2.3
ProcVersionSignature: Ubuntu 5.8.0-41.46-generic 5.8.18
Uname: Linux 5.8.0-41-generic x86_64
ApportVersion: 2.20.11-0ubuntu50.3
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC1: simone 2131 F.... pulseaudio
 /dev/snd/controlC0: simone 2131 F.... pulseaudio
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Sun Jan 31 15:56:52 2021
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=it_IT.UTF-8
 SHELL=/bin/bash
SourcePackage: pulseaudio
Symptom: audio
Symptom_Card: CMT-SBT20
Symptom_Type: Underruns, dropouts, or "crackling" sound
Title: [CMT-SBT20, playback] Underruns, dropouts or crackling sound
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 07/16/2019
dmi.bios.release: 5.14
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: X512DK.305
dmi.board.asset.tag: ATN12345678901234567
dmi.board.name: X512DK
dmi.board.vendor: ASUSTeK COMPUTER INC.
dmi.board.version: 1.0
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: ASUSTeK COMPUTER INC.
dmi.chassis.version: 1.0
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrX512DK.305:bd07/16/2019:br5.14:svnASUSTeKCOMPUTERINC.:pnVivoBook_ASUSLaptopX512DK_X512DK:pvr1.0:rvnASUSTeKCOMPUTERINC.:rnX512DK:rvr1.0:cvnASUSTeKCOMPUTERINC.:ct10:cvr1.0:
dmi.product.family: VivoBook
dmi.product.name: VivoBook_ASUSLaptop X512DK_X512DK
dmi.product.version: 1.0
dmi.sys.vendor: ASUSTeK COMPUTER INC.

[Daniel van Vugt (vanvugt)]

Thanks for the bug report.

It looks like you are using Bluetooth audio and also experiencing lots of kernel crashes in the rtw88_core module.

Just in case the kernel crashes are not related, please check that you don't still have the Settings window open as that can cause some audio quality problems.

Next, please try disabling wifi. Because 2.4GHz wifi networks can directly interfere with Bluetooth signal quality.

Please also run:

  lspci > lspci.txt
  lsusb > lsusb.txt

and attach the resulting text files here.

[Launchpad Janitor (janitor)]

[Expired for linux (Ubuntu) because there has been no activity for 60 days.]