Tested mpd today all day long about 10hours - no crackling at all, even with dsd 256 (11mbit). pulse and pipewire - stable crackling (1-5 in 5 minute about 0.2-0.3s).
So buses, alsa, kernel, etc cannot affect this. I can make other tests, change config settings, please suggest how to investigate further. -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to pulseaudio in Ubuntu. https://bugs.launchpad.net/bugs/1930550 Title: usb sound devices crackling Status in pulseaudio package in Ubuntu: Incomplete Bug description: After upgrade from 20.04 to 21.04 all 3 my usb sound devices start crackling, i have xduoo05plus, audeze mobius, audient id4. I also tried to modify default-fragments = 5 default-fragment-size-msec = 2 to different sugested on stackoverflow articles setting Also this is in my config: high-priority = yes nice-level = -11 realtime-scheduling = yes realtime-priority = 5 I even tried to switch to pipewire, but it still the same. Possible issue in alsa kernel drivers for usb interface, submitting bug to pulse as it default in ubuntu. ProblemType: Bug DistroRelease: Ubuntu 21.04 Package: pulseaudio 1:14.2-1ubuntu1 ProcVersionSignature: Ubuntu 5.11.0-17.18-generic 5.11.12 Uname: Linux 5.11.0-17-generic x86_64 NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair nvidia_modeset nvidia ApportVersion: 2.20.11-0ubuntu65.1 Architecture: amd64 CasperMD5CheckResult: unknown CurrentDesktop: KDE Date: Wed Jun 2 11:11:55 2021 InstallationDate: Installed on 2019-08-13 (658 days ago) InstallationMedia: Kubuntu 19.04 "Disco Dingo" - Release amd64 (20190416) PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon. SourcePackage: pulseaudio UpgradeStatus: Upgraded to hirsute on 2021-05-16 (16 days ago) dmi.bios.date: 08/12/2015 dmi.bios.release: 4.6 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: F11 dmi.board.asset.tag: To be filled by O.E.M. dmi.board.name: B85-HD3 dmi.board.vendor: Gigabyte Technology Co., Ltd. dmi.board.version: To be filled by O.E.M. dmi.chassis.asset.tag: To Be Filled By O.E.M. dmi.chassis.type: 3 dmi.chassis.vendor: Gigabyte Technology Co., Ltd. dmi.chassis.version: To Be Filled By O.E.M. dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrF11:bd08/12/2015:br4.6:svnGigabyteTechnologyCo.,Ltd.:pnB85-HD3:pvrTobefilledbyO.E.M.:rvnGigabyteTechnologyCo.,Ltd.:rnB85-HD3:rvrTobefilledbyO.E.M.:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvrToBeFilledByO.E.M.: dmi.product.family: To be filled by O.E.M. dmi.product.name: B85-HD3 dmi.product.sku: To be filled by O.E.M. dmi.product.version: To be filled by O.E.M. dmi.sys.vendor: Gigabyte Technology Co., Ltd. modified.conffile..etc.pulse.daemon.conf: [modified] modified.conffile..etc.pulse.system.pa: [modified] mtime.conffile..etc.pulse.daemon.conf: 2021-05-18T13:33:15.787174 mtime.conffile..etc.pulse.system.pa: 2021-05-18T11:20:40.860787 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/pulseaudio/+bug/1930550/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp