Unforunately, I believe this is an issue with the MOTU Ultralite AVB. Several people are actively trying to solve it over here: https://linuxmusicians.com/viewtopic.php?f=6&t=18046
-- You received this bug notification because you are a member of Desktop Packages, which is subscribed to alsa-driver in Ubuntu. https://bugs.launchpad.net/bugs/1782597 Title: Output of my USB audio device gets progressively bitcrushed Status in alsa-driver package in Ubuntu: New Bug description: After a while (between 5 and 10min), the output of my MOTU Ultralite AVB usb sound card gets dirtier and faintier (sounds like a bitcrushing effect) until there is no sound anymore. Sometimes muting the sound and switching to internal audio device and back to the motu will make the sound clean again, sometimes not. The Motu works ok with windows. ProblemType: Bug DistroRelease: Ubuntu 18.04 Package: alsa-base (not installed) ProcVersionSignature: Ubuntu 4.15.0-23.25-generic 4.15.18 Uname: Linux 4.15.0-23-generic x86_64 NonfreeKernelModules: nvidia_modeset nvidia ApportVersion: 2.20.9-0ubuntu7.2 Architecture: amd64 CurrentDesktop: ubuntu:GNOME Date: Thu Jul 19 16:52:34 2018 InstallationDate: Installed on 2016-05-01 (809 days ago) InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1) SourcePackage: alsa-driver Symptom: audio Symptom_Card: UltraLite AVB Baptiste - UltraLite AVB Baptiste Symptom_PulseAudioLog: juil. 19 16:29:48 multivac pulseaudio[1945]: [autospawn] core-util.c: Home directory not accessible: Permission non accordée juil. 19 16:29:48 multivac pulseaudio[1945]: [autospawn] lock-autospawn.c: Impossible d'accèder au verrou autonome. juil. 19 16:29:48 multivac pulseaudio[1945]: [pulseaudio] main.c: Failed to acquire autospawn lock juil. 19 16:30:00 multivac dbus-daemon[1441]: [system] Activating via systemd: service name='org.freedesktop.RealtimeKit1' unit='rtkit-daemon.service' requested by ':1.52' (uid=108 pid=3980 comm="/usr/bin/pulseaudio --start --log-target=syslog " label="unconfined") juil. 19 16:30:06 multivac systemd[1]: session-c1.scope: Killing process 3980 (pulseaudio) with signal SIGTERM. Symptom_Type: Sound works for a while, then breaks Title: [USB-Audio - UltraLite AVB Baptiste, playback] fails after a while UpgradeStatus: Upgraded to bionic on 2018-05-29 (50 days ago) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/1782597/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
