Sorry, this was a typo, it should have been "does not appear with 5.3.0-24-lowlatency". I edited it in the initial report.
Unfortunately also the detailed problem on askubuntu has been deleted by a moderator so here is a description of the behaviour under 5.3.0-26-lowlatency: In alsamixer the card is being recognized as "Fast Track C400" but with no "Chip" information and the message "This sound device does not have any controls". I checked already different USB2-ports, as well as testing with another sound interface of the same model. System: up to date Ubuntu Studio 19.10 Sound interfaces: M-Audio Fast Track C400 as card0 NVidia GTX 960 HDMI as card1 mainboard audio deactivated in BIOS I appended different outputs for /proc/asound, dmesg | grep -i audio, lsmod | grep snd and aplay -l. $ ls -l /proc/asound/ total 0 lrwxrwxrwx 1 root root 5 Jan 10 13:44 C400 -> card0 dr-xr-xr-x 2 root root 0 Jan 10 13:28 card0 dr-xr-xr-x 6 root root 0 Jan 10 13:28 card1 -r--r--r-- 1 root root 0 Jan 10 13:28 cards -r--r--r-- 1 root root 0 Jan 10 13:44 devices -r--r--r-- 1 root root 0 Jan 10 13:44 hwdep -r--r--r-- 1 root root 0 Jan 10 13:44 modules lrwxrwxrwx 1 root root 5 Jan 10 13:44 NVidia -> card1 dr-xr-xr-x 2 root root 0 Jan 10 13:44 oss -r--r--r-- 1 root root 0 Jan 10 13:44 pcm dr-xr-xr-x 2 root root 0 Jan 10 13:44 seq -r--r--r-- 1 root root 0 Jan 10 13:44 timers -r--r--r-- 1 root root 0 Jan 10 13:44 version $ ls -l /proc/asound/card0/ total 0 -r--r--r-- 1 root root 0 Jan 10 13:34 id -r--r--r-- 1 root root 0 Jan 10 13:51 midi0 -r--r--r-- 1 root root 0 Jan 10 13:34 usbbus -r--r--r-- 1 root root 0 Jan 10 13:51 usbid $ ls -l /proc/asound/card1/ total 0 -r--r--r-- 1 root root 0 Jan 10 13:44 codec#0 -rw-r--r-- 1 root root 0 Jan 10 13:44 eld#0.0 -rw-r--r-- 1 root root 0 Jan 10 13:44 eld#0.1 -rw-r--r-- 1 root root 0 Jan 10 13:44 eld#0.2 -rw-r--r-- 1 root root 0 Jan 10 13:44 eld#0.3 -r--r--r-- 1 root root 0 Jan 10 13:34 id dr-xr-xr-x 3 root root 0 Jan 10 13:28 pcm3p dr-xr-xr-x 3 root root 0 Jan 10 13:28 pcm7p dr-xr-xr-x 3 root root 0 Jan 10 13:28 pcm8p dr-xr-xr-x 3 root root 0 Jan 10 13:28 pcm9p $ dmesg | grep -i audio [ 0.167125] ACPI: Added _OSI(Linux-Lenovo-NV-HDMI-Audio) [ 0.834535] usb 3-3: Manufacturer: M-Audio [ 1.352576] input: M-Audio Fast Track C400 as /devices/pci0000:00/0000:00:14.0/usb3/3-3/3-3:1.5/0003:0763:2030.0001/input/input2 [ 1.404329] hid-generic 0003:0763:2030.0001: input,hidraw0: USB HID v1.10 Keyboard [M-Audio Fast Track C400] on usb-0000:00:14.0-3/input5 [ 18.105271] usbcore: registered new interface driver snd-usb-audio [ 18.147642] snd_hda_intel 0000:01:00.1: Handle vga_switcheroo audio client [ 409.796054] snd_hda_codec_hdmi hdaudioC1D0: HDMI: invalid ELD data byte 8 $ lsmod | grep snd snd_hda_codec_hdmi 61440 1 snd_hda_intel 49152 2 snd_hda_codec 135168 2 snd_hda_codec_hdmi,snd_hda_intel snd_usb_audio 241664 0 snd_usbmidi_lib 36864 1 snd_usb_audio snd_hda_core 86016 3 snd_hda_codec_hdmi,snd_hda_intel,snd_hda_codec mc 53248 1 snd_usb_audio snd_hwdep 20480 2 snd_usb_audio,snd_hda_codec snd_pcm 106496 5 snd_hda_codec_hdmi,snd_hda_intel,snd_usb_audio,snd_hda_codec,snd_hda_core snd_seq_midi 20480 0 snd_seq_midi_event 16384 1 snd_seq_midi snd_rawmidi 36864 2 snd_seq_midi,snd_usbmidi_lib snd_seq 69632 2 snd_seq_midi,snd_seq_midi_event snd_seq_device 16384 3 snd_seq,snd_seq_midi,snd_rawmidi snd_timer 36864 2 snd_seq,snd_pcm snd 86016 15 snd_seq,snd_seq_device,snd_hda_codec_hdmi,snd_hwdep,snd_hda_intel,snd_usb_audio,snd_usbmidi_lib,snd_hda_codec,snd_timer,snd_pcm,snd_rawmidi soundcore 16384 1 snd $ aplay -l **** List of PLAYBACK Hardware Devices **** card 1: NVidia [HDA NVidia], device 3: HDMI 0 [HDMI 0] Subdevices: 1/1 Subdevice #0: subdevice #0 card 1: NVidia [HDA NVidia], device 7: HDMI 1 [HDMI 1] Subdevices: 1/1 Subdevice #0: subdevice #0 card 1: NVidia [HDA NVidia], device 8: HDMI 2 [HDMI 2] Subdevices: 1/1 Subdevice #0: subdevice #0 card 1: NVidia [HDA NVidia], device 9: HDMI 3 [HDMI 3] Subdevices: 1/1 Subdevice #0: subdevice #0 ** Description changed: An usb-interface (M-Audio Fast Track C400) is being recognized but not its pcm devices. - The problem does not appear with kernel 5.3.0-26-lowlatency. + The problem does not appear with kernel 5.3.0-24-lowlatency. A detailed report can be found here: https://askubuntu.com/questions/1201968/ubuntu-studio-19-10-usb-sound-card-not-working-anymore-appears-in-proc-asound ProblemType: Bug DistroRelease: Ubuntu 19.10 Package: linux-image-5.3.0-26-lowlatency 5.3.0-26.28 ProcVersionSignature: Ubuntu 5.3.0-26.28-lowlatency 5.3.13 Uname: Linux 5.3.0-26-lowlatency x86_64 NonfreeKernelModules: nvidia_modeset nvidia ApportVersion: 2.20.11-0ubuntu8.2 Architecture: amd64 AudioDevicesInUse: - USER PID ACCESS COMMAND - /dev/snd/controlC1: sihorn 1767 F.... pulseaudio + USER PID ACCESS COMMAND + /dev/snd/controlC1: sihorn 1767 F.... pulseaudio CurrentDesktop: XFCE Date: Wed Jan 15 09:57:00 2020 InstallationDate: Installed on 2019-11-27 (48 days ago) InstallationMedia: Ubuntu-Studio 19.10 "Eoan Ermine" - Release amd64 (20191017) IwConfig: - lo no wireless extensions. - - enp3s0 no wireless extensions. + lo no wireless extensions. + + enp3s0 no wireless extensions. MachineType: Gigabyte Technology Co., Ltd. B85-HD3 ProcFB: 0 EFI VGA ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.3.0-26-lowlatency root=UUID=c01dfb46-88ab-4289-8362-b7871c21ef2f ro quiet splash vt.handoff=1 RelatedPackageVersions: - linux-restricted-modules-5.3.0-26-lowlatency N/A - linux-backports-modules-5.3.0-26-lowlatency N/A - linux-firmware 1.183.3 + linux-restricted-modules-5.3.0-26-lowlatency N/A + linux-backports-modules-5.3.0-26-lowlatency N/A + linux-firmware 1.183.3 RfKill: - + SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 07/04/2014 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: F2 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: x.x 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.:bvrF2:bd07/04/2014:svnGigabyteTechnologyCo.,Ltd.:pnB85-HD3:pvrTobefilledbyO.E.M.:rvnGigabyteTechnologyCo.,Ltd.:rnB85-HD3:rvrx.x: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. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1859781 Title: snd_usb_audio not working in 5.3.0-26-lowlatency Status in linux package in Ubuntu: Incomplete Bug description: An usb-interface (M-Audio Fast Track C400) is being recognized but not its pcm devices. The problem does not appear with kernel 5.3.0-24-lowlatency. A detailed report can be found here: https://askubuntu.com/questions/1201968/ubuntu-studio-19-10-usb-sound-card-not-working-anymore-appears-in-proc-asound ProblemType: Bug DistroRelease: Ubuntu 19.10 Package: linux-image-5.3.0-26-lowlatency 5.3.0-26.28 ProcVersionSignature: Ubuntu 5.3.0-26.28-lowlatency 5.3.13 Uname: Linux 5.3.0-26-lowlatency x86_64 NonfreeKernelModules: nvidia_modeset nvidia ApportVersion: 2.20.11-0ubuntu8.2 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC1: sihorn 1767 F.... pulseaudio CurrentDesktop: XFCE Date: Wed Jan 15 09:57:00 2020 InstallationDate: Installed on 2019-11-27 (48 days ago) InstallationMedia: Ubuntu-Studio 19.10 "Eoan Ermine" - Release amd64 (20191017) IwConfig: lo no wireless extensions. enp3s0 no wireless extensions. MachineType: Gigabyte Technology Co., Ltd. B85-HD3 ProcFB: 0 EFI VGA ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.3.0-26-lowlatency root=UUID=c01dfb46-88ab-4289-8362-b7871c21ef2f ro quiet splash vt.handoff=1 RelatedPackageVersions: linux-restricted-modules-5.3.0-26-lowlatency N/A linux-backports-modules-5.3.0-26-lowlatency N/A linux-firmware 1.183.3 RfKill: SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 07/04/2014 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: F2 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: x.x 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.:bvrF2:bd07/04/2014:svnGigabyteTechnologyCo.,Ltd.:pnB85-HD3:pvrTobefilledbyO.E.M.:rvnGigabyteTechnologyCo.,Ltd.:rnB85-HD3:rvrx.x: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. 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