You could temporarily remove the module-switch-on-connect from the /etc/pulse/default.pa, reboot and redo the test.
To check if switch-on-connect is loaded or not, run "pactl list modules | grep connect" -- 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/1873104 Title: Defaults to USB audio after every reboot Status in alsa-driver package in Ubuntu: New Bug description: I manually set my audio output to the Line Out. Every reboot this settings is lost and the system defaults back to the USB output. I have several other distros to test - Ubuntu and its flavors are the only ones that have this problem. Something changed in 19.04 or 19.10 that broke this, and it continues to be an issue in 20.04. ProblemType: Bug DistroRelease: Ubuntu 20.04 Package: alsa-base 1.0.25+dfsg-0ubuntu5 ProcVersionSignature: Ubuntu 5.4.0-21.25-generic 5.4.27 Uname: Linux 5.4.0-21-generic x86_64 NonfreeKernelModules: nvidia_modeset nvidia ApportVersion: 2.20.11-0ubuntu26 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC2: caleb 1778 F.... pulseaudio /dev/snd/controlC3: caleb 1778 F.... pulseaudio /dev/snd/controlC1: caleb 1778 F.... pulseaudio /dev/snd/controlC0: caleb 1778 F.... pulseaudio CasperMD5CheckResult: skip CurrentDesktop: MATE Date: Wed Apr 15 19:32:36 2020 PackageArchitecture: all SourcePackage: alsa-driver Symptom: audio Title: USB sound card not detected UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 09/06/2018 dmi.bios.vendor: AMI dmi.bios.version: F.30 dmi.board.name: 8437 dmi.board.vendor: HP dmi.board.version: 1.3 dmi.chassis.type: 3 dmi.chassis.vendor: HP dmi.modalias: dmi:bvnAMI:bvrF.30:bd09/06/2018:svnHP:pnOMENbyHPDesktopPC880-p1xx:pvr:rvnHP:rn8437:rvr1.3:cvnHP:ct3:cvr: dmi.product.family: 103C_53311M HP Omen dmi.product.name: OMEN by HP Desktop PC 880-p1xx dmi.product.sku: 2TB61AV dmi.sys.vendor: HP To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/1873104/+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
