Os pongo unos logs del jack, pulse audio y alsa.
ibanez@s520:/var/log$ tail -3000 syslog | grep jackaudio
May 9 15:44:21 s520 dbus-daemon[1709]: [session uid=1000 pid=1709] Activating service name='org.jackaudio.service' requested by ':1.24' (uid=1000 pid=1877 comm="/usr/bin/python3 /usr/share/cadence/src/cadence_se" label="unconfined")
May 9 15:44:21 s520 dbus-daemon[1709]: [session uid=1000 pid=1709] Successfully activated service 'org.jackaudio.service'
May 9 15:44:21 s520 org.jackaudio.service[1881]: no message buffer overruns
May 9 15:44:22 s520 org.jackaudio.service[1881]: message repeated 2 times: [ no message buffer overruns]
May 9 15:44:23 s520 dbus-daemon[1709]: [session uid=1000 pid=1709] Activating service name='org.jackaudio.service' requested by ':1.24' (uid=1000 pid=1877 comm="/usr/bin/python3 /usr/share/cadence/src/cadence_se" label="unconfined")
May 9 15:44:23 s520 dbus-daemon[1709]: [session uid=1000 pid=1709] Successfully activated service 'org.jackaudio.service'
May 9 15:44:23 s520 org.jackaudio.service[2068]: no message buffer overruns
May 9 15:44:23 s520 org.jackaudio.service[2068]: no message buffer overruns
May 9 15:44:23 s520 org.jackaudio.service[2068]: no message buffer overruns
May 9 15:56:44 s520 dbus-daemon[1709]: [session uid=1000 pid=1709] Activating service name='org.jackaudio.service' requested by ':1.108' (uid=1000 pid=2252 comm="/usr/bin/python3 /usr/share/cadence/src/cadence.py" label="unconfined")
May 9 15:56:44 s520 dbus-daemon[1709]: [session uid=1000 pid=1709] Successfully activated service 'org.jackaudio.service'
May 9 15:56:44 s520 org.jackaudio.service[4601]: no message buffer overruns
May 9 15:56:44 s520 org.jackaudio.service[4601]: message repeated 2 times: [ no message buffer overruns]
May 9 17:33:31 s520 dbus-daemon[1709]: [session uid=1000 pid=1709] Activating service name='org.jackaudio.service' requested by ':1.108' (uid=1000 pid=2252 comm="/usr/bin/python3 /usr/share/cadence/src/cadence.py" label="unconfined")
May 9 17:33:31 s520 dbus-daemon[1709]: [session uid=1000 pid=1709] Successfully activated service 'org.jackaudio.service'
May 9 17:33:31 s520 org.jackaudio.service[9167]: no message buffer overruns
May 9 17:33:31 s520 org.jackaudio.service[9167]: message repeated 2 times: [ no message buffer overruns]
May 9 17:49:22 s520 dbus-daemon[1709]: [session uid=1000 pid=1709] Activating service name='org.jackaudio.service' requested by ':1.108' (uid=1000 pid=2252 comm="/usr/bin/python3 /usr/share/cadence/src/cadence.py" label="unconfined")
May 9 17:49:22 s520 dbus-daemon[1709]: [session uid=1000 pid=1709] Successfully activated service 'org.jackaudio.service'
May 9 17:49:22 s520 org.jackaudio.service[9486]: no message buffer overruns
May 9 17:49:22 s520 org.jackaudio.service[9486]: message repeated 2 times: [ no message buffer overruns]
ibanez@s520:/var/log$ tail -3000 syslog | grep pulseaudio
May 9 15:43:58 s520 dbus-daemon[974]: [system] Activating via systemd: service name='org.freedesktop.RealtimeKit1' unit='rtkit-daemon.service' requested by ':1.38' (uid=126 pid=1393 comm="/usr/bin/pulseaudio --daemonize=no --log-target=jo" label="unconfined")
May 9 15:44:20 s520 systemd[1368]: pulseaudio.service: Succeeded.
May 9 15:44:23 s520 systemd[1678]: pulseaudio.service: Main process exited, code=killed, status=9/KILL
May 9 15:44:23 s520 systemd[1678]: pulseaudio.service: Failed with result 'signal'.
May 9 15:44:23 s520 systemd[1678]: pulseaudio.service: Scheduled restart job, restart counter is at 1.
May 9 15:44:25 s520 pulseaudio[2059]: Stale PID file, overwriting.
May 9 15:44:26 s520 pulseaudio[2059]: JACK error >Cannot use real-time scheduling (RR/5)(1: Operación no permitida)<
May 9 15:44:26 s520 pulseaudio[2059]: JACK error >JackClient::AcquireSelfRealTime error<
May 9 15:44:27 s520 pulseaudio[2059]: JACK error >Cannot use real-time scheduling (RR/5)(1: Operación no permitida)<
May 9 15:44:27 s520 pulseaudio[2059]: JACK error >JackClient::AcquireSelfRealTime error<
May 9 15:44:31 s520 systemd[1368]: pulseaudio.socket: Succeeded.
May 9 15:56:33 s520 pulseaudio[2059]: Failed to load module "module-alsa-card" (argument: "device_id="3" name="usb-Burr-Brown_from_TI_USB_Audio_CODEC-00" card_name="alsa_card.usb-Burr-Brown_from_TI_USB_Audio_CODEC-00" namereg_fail=false tsched=yes fixed_latency_range=no ignore_dB=no deferred_volume=yes use_ucm=yes avoid_resampling=no card_properties="module-udev-detect.discovered=1""): initialization failed.
May 9 15:56:44 s520 systemd[1678]: pulseaudio.service: Main process exited, code=killed, status=9/KILL
May 9 15:56:44 s520 systemd[1678]: pulseaudio.service: Failed with result 'signal'.
May 9 15:56:44 s520 systemd[1678]: pulseaudio.service: Scheduled restart job, restart counter is at 2.
May 9 15:56:45 s520 pulseaudio[4611]: Stale PID file, overwriting.
May 9 15:56:49 s520 pulseaudio[4611]: JACK error >Cannot use real-time scheduling (RR/5)(1: Operación no permitida)<
May 9 15:56:49 s520 pulseaudio[4611]: JACK error >JackClient::AcquireSelfRealTime error<
May 9 15:56:49 s520 pulseaudio[4611]: JACK error >Cannot use real-time scheduling (RR/5)(1: Operación no permitida)<
May 9 15:56:49 s520 pulseaudio[4611]: JACK error >JackClient::AcquireSelfRealTime error<
May 9 17:25:37 s520 pulseaudio[4611]: Failed to load module "module-alsa-card" (argument: "device_id="3" name="usb-Burr-Brown_from_TI_USB_Audio_CODEC-00" card_name="alsa_card.usb-Burr-Brown_from_TI_USB_Audio_CODEC-00" namereg_fail=false tsched=yes fixed_latency_range=no ignore_dB=no deferred_volume=yes use_ucm=yes avoid_resampling=no card_properties="module-udev-detect.discovered=1""): initialization failed.
May 9 17:33:31 s520 systemd[1678]: pulseaudio.service: Main process exited, code=killed, status=9/KILL
May 9 17:33:31 s520 systemd[1678]: pulseaudio.service: Killing process 4636 (gmain) with signal SIGKILL.
May 9 17:33:31 s520 systemd[1678]: pulseaudio.service: Killing process 4637 (gdbus) with signal SIGKILL.
May 9 17:33:31 s520 systemd[1678]: pulseaudio.service: Failed with result 'signal'.
May 9 17:33:31 s520 systemd[1678]: pulseaudio.service: Scheduled restart job, restart counter is at 3.
May 9 17:33:31 s520 pulseaudio[9191]: Stale PID file, overwriting.
May 9 17:33:37 s520 pulseaudio[9191]: JACK error >Cannot use real-time scheduling (RR/5)(1: Operación no permitida)<
May 9 17:33:37 s520 pulseaudio[9191]: JACK error >JackClient::AcquireSelfRealTime error<
May 9 17:33:37 s520 pulseaudio[9191]: JACK error >Cannot use real-time scheduling (RR/5)(1: Operación no permitida)<
May 9 17:33:37 s520 pulseaudio[9191]: JACK error >JackClient::AcquireSelfRealTime error<
May 9 17:49:02 s520 pulseaudio[9191]: Failed to load module "module-alsa-card" (argument: "device_id="3" name="usb-Burr-Brown_from_TI_USB_Audio_CODEC-00" card_name="alsa_card.usb-Burr-Brown_from_TI_USB_Audio_CODEC-00" namereg_fail=false tsched=yes fixed_latency_range=no ignore_dB=no deferred_volume=yes use_ucm=yes avoid_resampling=no card_properties="module-udev-detect.discovered=1""): initialization failed.
May 9 17:49:22 s520 systemd[1678]: pulseaudio.service: Main process exited, code=killed, status=9/KILL
May 9 17:49:22 s520 systemd[1678]: pulseaudio.service: Failed with result 'signal'.
May 9 17:49:22 s520 systemd[1678]: pulseaudio.service: Scheduled restart job, restart counter is at 4.
May 9 17:49:23 s520 pulseaudio[9495]: Stale PID file, overwriting.
May 9 17:49:29 s520 pulseaudio[9495]: JACK error >Cannot use real-time scheduling (RR/5)(1: Operación no permitida)<
May 9 17:49:29 s520 pulseaudio[9495]: JACK error >JackClient::AcquireSelfRealTime error<
May 9 17:49:29 s520 pulseaudio[9495]: JACK error >Cannot use real-time scheduling (RR/5)(1: Operación no permitida)<
May 9 17:49:29 s520 pulseaudio[9495]: JACK error >JackClient::AcquireSelfRealTime error<
ibanez@s520:/var/log$ tail -3000 syslog | grep alsa
May 9 15:43:56 s520 alsactl[1201]: No state is present for card Loopback
May 9 15:43:56 s520 alsactl[1201]: Found hardware: "Loopback" "Loopback Mixer" "" "" ""
May 9 15:43:56 s520 alsactl[1201]: Hardware is initialized using a generic method
May 9 15:43:56 s520 alsactl[1201]: No state is present for card Loopback
May 9 15:56:33 s520 pulseaudio[2059]: Failed to load module "module-alsa-card" (argument: "device_id="3" name="usb-Burr-Brown_from_TI_USB_Audio_CODEC-00" card_name="alsa_card.usb-Burr-Brown_from_TI_USB_Audio_CODEC-00" namereg_fail=false tsched=yes fixed_latency_range=no ignore_dB=no deferred_volume=yes use_ucm=yes avoid_resampling=no card_properties="module-udev-detect.discovered=1""): initialization failed.
May 9 16:33:26 s520 systemd-udevd[4945]: controlC4: Process '/usr/sbin/alsactl -E HOME=/run/alsa -E XDG_RUNTIME_DIR=/run/alsa/runtime restore 4' failed with exit code 99.
May 9 17:25:37 s520 pulseaudio[4611]: Failed to load module "module-alsa-card" (argument: "device_id="3" name="usb-Burr-Brown_from_TI_USB_Audio_CODEC-00" card_name="alsa_card.usb-Burr-Brown_from_TI_USB_Audio_CODEC-00" namereg_fail=false tsched=yes fixed_latency_range=no ignore_dB=no deferred_volume=yes use_ucm=yes avoid_resampling=no card_properties="module-udev-detect.discovered=1""): initialization failed.
May 9 17:49:02 s520 pulseaudio[9191]: Failed to load module "module-alsa-card" (argument: "device_id="3" name="usb-Burr-Brown_from_TI_USB_Audio_CODEC-00" card_name="alsa_card.usb-Burr-Brown_from_TI_USB_Audio_CODEC-00" namereg_fail=false tsched=yes fixed_latency_range=no ignore_dB=no deferred_volume=yes use_ucm=yes avoid_resampling=no card_properties="module-udev-detect.discovered=1""): initialization failed.
ibanez@s520:/var/log$