Running Jessie and aplay -l gives me this: **** List of PLAYBACK Hardware Devices **** card 0: PCH [HDA Intel PCH], device 0: ALC887-VD Analog [ALC887-VD Analog] Subdevices: 1/1 Subdevice #0: subdevice #0 card 0: PCH [HDA Intel PCH], device 1: ALC887-VD Digital [ALC887-VD Digital] Subdevices: 1/1 Subdevice #0: subdevice #0 card 1: HDMI [HDA ATI HDMI], device 3: HDMI 0 [HDMI 0] Subdevices: 1/1 Subdevice #0: subdevice #0 card 2: Device [USB Advanced Audio Device], device 0: USB Audio [USB Audio] Subdevices: 1/1 Subdevice #0: subdevice #0 The usb card is my only working device (alsaplayer -o alsa -d hw:2,0 rocknroll.mp3 confirms this) so I came up with the following /etc/modprobe.d/sound file and restarted pulseaudio: options snd cards_limit=3 alias snd-card-0 snd-1 alias snd-card-1 snd-hdmi alias snd-card-2 snd-usb options snd slots=snd_usb_audio,snd_hd_intel,snd-1 But still no sound on my system. What am I not doing? I had to create the sound file above as there was none before. So maybe that's an outdated way of doing things.

I am trying to capture and play audio using C program. For this I [got this tutorial.]. Here is the program which I am running:- /** * Jan Newmarch */ #define PERIOD_SIZE 1024 #define BUF_SIZE (PERIOD_SIZE * 2) #include #include #include void print_pcm_state(snd_pcm_t *handle, char *name) { switch (snd_pcm_state(handle)) { case SND_PCM_STATE_OPEN: printf("state open %s\n", name); break; case SND_PCM_STATE_SETUP: printf("state setup %s\n", name); break; case SND_PCM_STATE_PREPARED: printf("state prepare %s\n", name); break; case SND_PCM_STATE_RUNNING: printf("state running %s\n", name); break; case SND_PCM_STATE_XRUN: printf("state xrun %s\n", name); break; default: printf("state other %s\n", name); break; } } int setparams(snd_pcm_t *handle, char *name) { snd_pcm_hw_params_t *hw_params; int err; if ((err = snd_pcm_hw_params_malloc (&hw_params)) /etc/modprobe.d/alsa-base.conf Here are the changes :- I replace options snd_usb_audio index=-2 options snd_hda_intel index=-1 with options snd_usb_audio index=-1 options snd_hda_intel index=-2 And I replace # Keep snd-usb-audio from beeing loaded as first soundcard options snd-usb-audio index=-1 with # Keep snd-usb-audio from beeing loaded as first soundcard options snd-usb-audio index=-1 Now, when i run my code , I got this output:- Rate for playback is 48000 period size now 1024 period size 1024 buffer size 2048 Rate for capture is 48000 cannot set channel count (Invalid argument) So, can anyone tell me what else should I do to run my code using sound card. Note:- I run command aplay -l and got this output:- card 0: Device [USB PnP Sound Device], device 0: USB Audio [USB Audio] Subdevices: 1/1 Subdevice #0: subdevice #0 card 1: PCH [HDA Intel PCH], device 0: ALC221 Analog [ALC221 Analog] Subdevices: 1/1 Subdevice #0: subdevice #0

I am looking for a Alsa mixer GUI for Xfce (or better yet, desktop-independent) to replace PulseAudio Mixer. While I'm happy with the latter, my USB DAC is very poorly handled by PulseAudio and I need to remove it. In the Alsa-based mixer I am looking specifically for the ability to: * detect plugged-in USB DACs * set default playback device for new programs (e.g. to USB DAC) * (optional) transparently change running programs currently outputting sound from one playback device to another (e.g. from integrated HDA PCH to USB DAC) So is there a pavucontrol-like Alsa mixer out there?

I was attempting to connect to a Google Meet call on my browser (Chromium) and where it would normally have found my USB audio device (a USB dongle that I can connect a microphone and line-out/speaker on their own 3.5mm jacks) for some reason it no longer was. Going into pavucontrol and my volume control applet, and so on, did not detect the device. As mentioned, this used to work no problem, with me connecting, disconnecting, reconnecting the USB dongle at will (and where it is normally not connected, for privacy reasons).

I have a samson GO mic, to which I've connected my headphones. Sometimes, it will play back the input it receives on the microphone back on the headphones that I connected to it. On windows, the fix for this was to go to the sound settings and toggle "Listen to this device" on and back off, after which it was fixed for an indeterminate time. Now I'm running NixOS, with pipewire and wireplumber, with support for pulse and alsa. pw-ctl gives back 6 connected ids for my microphone: Front Left and Front Right for playback, input monitor and microphone (input). pactl list sinks short only gives back one sink for the device, as well as the monitor source, but again, no listen back or anything like that. pavucontrol just shows one audio device with 2 channels as well, as well as the monitor and microphone inputs. Changing the configuration does not help this issue either. Currently I have it set to analog stereo duplex. What could be causing this issue and how would I go about resolving it?

I'm having issues getting my audio interface (Mackie DLZ Creator) working properly on my Linux machines. I've tried using both PulseAudio and Pipewire, although I've been focusing mostly on using Pipewire. I'm also having the same issues on both Debian and NixOS. I'm seeing the device over USB, and when no audio is playing I see the sources and sinks with wpctl status:

> wpctl status    
PipeWire 'pipewire-0' [1.0.1]

Audio
 ├─ Devices:
 │      48. Rembrandt Radeon High Definition Audio Controller [alsa]
 │      50. Family 17h/19h HD Audio Controller  [alsa]
 │      94. DLZ Creator                         [alsa]
 │  
 ├─ Sinks:
 │      38. Family 17h/19h HD Audio Controller Analog Stereo [vol: 0.35]
 │  *   49. DLZ Creator Analog Surround 4.0     [vol: 0.53]
 │  
 ├─ Sink endpoints:
 │  
 ├─ Sources:
 │      54. Family 17h/19h HD Audio Controller Analog Stereo [vol: 0.26]
 │  *   68. DLZ Creator Multichannel            [vol: 1.00]
 │  
 ├─ Source endpoints:
 │  
 └─ Streams:

Settings
 └─ Default Configured Node Names:
         0. Audio/Sink    alsa_output.usb-LOUD_Audio__LLC_DLZ_Creator_no_serial_number-00.analog-surround-40
         1. Audio/Source  alsa_input.usb-LOUD_Audio__LLC_DLZ_Creator_no_serial_number-00.multichannel-input

I've also set the DLZ Creator as the default source and sink. However, once I start playing some audio, the output comes through my laptop speakers instead of the DLZ Creator. I can also see the DLZ Creator appearing and disappearing from the list of devices over and over again while the audio is playing. journalctl shows this batch of logs happening over and over:

Jun 18 12:56:39 kernel: usb 1-1: new high-speed USB device number 19 using xhci_hcd
Jun 18 12:56:40 kernel: usb 1-1: New USB device found, idVendor=0a73, idProduct=0033, bcdDevice= 1.30
Jun 18 12:56:40 kernel: usb 1-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
Jun 18 12:56:40 kernel: usb 1-1: Product: DLZ Creator
Jun 18 12:56:40 kernel: usb 1-1: Manufacturer: LOUD Audio, LLC
Jun 18 12:56:40 kernel: usb 1-1: SerialNumber: no serial number
Jun 18 12:56:40 kernel: usb 1-1: USB disconnect, device number 19
Jun 18 12:56:40 pipewire: spa.alsa: surround40:4p: snd_pcm_drop: No such device
Jun 18 12:56:40 pipewire: spa.alsa: surround40:4p: close failed: No such device

dmesg shows similarly repeating logs:

[57648.041528] usb 1-1: new high-speed USB device number 124 using xhci_hcd
[57648.172355] usb 1-1: New USB device found, idVendor=0a73, idProduct=0033, bcdDevice= 1.30
[57648.172365] usb 1-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[57648.172371] usb 1-1: Product: DLZ Creator
[57648.172375] usb 1-1: Manufacturer: LOUD Audio, LLC
[57648.172378] usb 1-1: SerialNumber: no serial number
[57667.052179] usb 1-1: USB disconnect, device number 124

I've done a lot of troubleshooting focusing on what cables and ports I'm using, and once I pulled out an old Mac to double check that cables are working properly, I discovered strange: The DLZ Creator works properly if I plug it into the Mac _first_ and then plug it into a Linux machine _without turning the DLZ off/on in between_. However, if I turn on the DLZ and it is already connected to the Linux box, it exhibits the disconnect/connect loop when I begin playing any audio. Doing a round trip to the Mac and back with the USB cable fixes it. This is all using the same cables and ports. Does anyone have advice about what to try?

I am currently developing a usb soundcard that is usb audio class 2 compliant. In my current setup I have audio and mute controls for several channels working in alsamixer. The USB audio class 2 spec also supports a lot of other controls such as bass, mid, treble, equalizers, effects, etc. I have been trying to find a list of controls supported by alsamixer but the documentation does not mention any specifics on what kind of controls are supported. If someone has a list with supported controls or an alternative command-line program that would be greatly appreciated.

I've been trying to figure this out for a while, and I've even posted a few questions from different angles on it, but I have yet to get a response. So, if my question is nonsense, please let me know. If there is something missing that would make this easier to understand, please let me know. Here is the basic problem. I've got a RaspPi 5, with a PolyCom P3200M speaker attached to it. (It is actually for conference calls, so it is mic/speaker in one.) I want to trigger events if the volume keys on the speaker itself are pressed. If I run amixer -Dsysdefault:2 sset PCM Playback 5 for example, it will indeed set the volume on the speaker hardware to that level. If I run amixer -Dsysdefault:2 events, and then issue in a separate term amixer -Dsysdefault:2 sset PCM Playback 5, the events are indeed captured. However, if, instead, I push the volume buttons on the speaker, the volume on the speaker will change, but no event is triggered for amixer to react to. Can this be done? Can I trigger an event on amixer events when I push the volume buttons on the speaker? Is there another way to get to the same end point of knowing when the buttons are pressed?

I'm having a terrible time with ALSA on a PI5. It will play and record sound, but the control interface seems to only work sometimes. I cannot find a cause for this. I could use some help understanding what is going on. My objective is to have a USB speaker (Polycom P3200M) reset its volume to the last volume setting on a boot. This should work with alsactl rdaemon. Further, there is a canned service in alsa-state.service that should do that. It is not working. I already have /etc/asla/state-daemon.conf in place, so the rdaemon option should be running. A look at ps -ef shows:

root         660       1  0 20:06 ?        00:00:00 /usr/sbin/alsactl -E HOME=/run/alsa -E XDG_RUNTIME_DIR=/run/alsa/runtime -s -n 19 -c rdaemon

So, I have to assume the service is running correctly. The problem is that if I execute amixer -c2 I don't get the correct output. For example it will show:

Simple mixer control 'PCM',0
  Capabilities: pvolume pvolume-joined pswitch pswitch-joined
  Playback channels: Mono
  Limits: Playback 0 - 20
  Mono: Playback 9 [45%] [-22.00dB] [on]
Simple mixer control 'Headset',0
  Capabilities: cswitch cswitch-joined
  Capture channels: Mono
  Mono: Capture [on]

If I then change the volume on the speaker by pushing the buttons, and rerun axmixer -c2, I get the exact same output. By looking at the timestamp on /var/lib/alsa/asound.state I can see that the file is only touched at boot, and then never again. Finally, in a fit of frustration, I wrote my own code to monitor the device, and determine when the volume was changed.

#include 
#include 

int elem_callback(snd_mixer_elem_t *elem,unsigned int mask);

int main(int argc, char* argv[])
{
	long min, max;
	snd_mixer_t *handle;
	snd_mixer_selem_id_t *sid;
    	const char *selem_name = "PCM";
	long curVolume;
	int res;
	
	if(argc!=2)
	{
		return(1);
	}
	snd_mixer_open(&handle, 0);
	snd_mixer_attach(handle, argv);
	snd_mixer_selem_register(handle, NULL, NULL);
	snd_mixer_load(handle);

	snd_mixer_selem_id_alloca(&sid);
	snd_mixer_selem_id_set_index(sid, 0);
	snd_mixer_selem_id_set_name(sid, selem_name);
	snd_mixer_elem_t* elem = snd_mixer_find_selem(handle, sid);

	printf("Name: %s\n",snd_mixer_selem_get_name(elem));


	snd_mixer_selem_get_playback_volume_range(elem, &min, &max);
	printf("max: %d\nmin:%d\n",max,min);
	snd_mixer_selem_get_playback_volume(elem,SND_MIXER_SCHN_MONO,&curVolume);
	printf("Current Volume: %d\n",curVolume);

	snd_mixer_elem_set_callback(elem,elem_callback);

	while(1)
	{
		res=snd_mixer_wait(handle,-1);
		res=snd_mixer_handle_events(handle);
	}
    	snd_mixer_close(handle);

    return(0);
}


int elem_callback(snd_mixer_elem_t *elem,unsigned int mask)
{
	long curVolume;

	switch(mask)
	{
		case 1:
			snd_mixer_selem_get_playback_volume(elem,SND_MIXER_SCHN_MONO,&curVolume);
			printf("Current Volume: %d\n",curVolume);
			printf("\tmask:  %d\n",mask);
			break;
		default:
			printf("Unrecognized mask: %d\n",mask);
			break;
	}
	return (0);
}

I lifted most of this code from [link](https://stackoverflow.com/questions/6787318/set-alsa-master-volume-from-c-code) What is truly bothersome is the above code worked. I could press the volume button on the speaker and the callback would get triggered. All was good. Then I rebooted the system and came back a day later. Now the code does nothing. It will output what it thinks the current settings are (which are not correct) but it will not react to the button presses. I'm at a loss. Why is ALSA sometimes working?

I had audio working on my AlmaLinux 9 installation, using a USB sound card. I seemed to have changed something because I no longer hear audio (but AlmaLinux thinks its successfully playing a sound). I did switch from GUI to text mode on boot, but I don't think that should matter. I have no idea how to proceed...hopefully someone sees something wrong here: For example, the following command completes successfully: aplay /data/sounds/intruder_alert.wav Playing WAVE '/data/sounds/intruder_alert.wav' : Signed 16 bit Little Endian, Rate 22050 Hz, Mono I confirmed my USB audio device is detected on bootup (not sure if 'input,hidraw1' is a clue): [ 2.586749] hub 2-2:1.0: USB hub found [ 2.589077] hub 2-2:1.0: 7 ports detected [ 3.536316] usb 2-2.1: new full-speed USB device number 4 using uhci_hcd [ 4.432226] usb 2-2.1: New USB device found, idVendor=08bb, idProduct=2902, bcdDevice= 1.00 [ 4.432236] usb 2-2.1: New USB device strings: Mfr=1, Product=2, SerialNumber=0 [ 4.432243] usb 2-2.1: Product: USB Audio CODEC [ 4.432248] usb 2-2.1: Manufacturer: Burr-Brown from TI [ 4.524947] input: Burr-Brown from TI USB Audio CODEC as /devices/pci0000:00/0000:00:11.0/0000:02:00.0/usb2/2-2/2-2.1/2-2.1:1.3/0003:08BB:2902.0002/input/input6 [ 4.583437] hid-generic 0003:08BB:2902.0002: input,hidraw1: USB HID v1.00 Device [Burr-Brown from TI USB Audio CODEC ] on usb-0000:02:00.0-2.1/input3 and sound related drivers are loaded by kernel: lsmod | grep snd snd_seq_dummy 16384 0 snd_hrtimer 16384 1 snd_usb_audio 385024 2 snd_usbmidi_lib 45056 1 snd_usb_audio snd_hwdep 16384 1 snd_usb_audio snd_seq 94208 7 snd_seq_dummy snd_pcm 151552 1 snd_usb_audio snd_timer 49152 3 snd_seq,snd_hrtimer,snd_pcm snd_rawmidi 45056 1 snd_usbmidi_lib snd_seq_device 16384 2 snd_seq,snd_rawmidi snd 122880 14 snd_seq,snd_seq_device,snd_hwdep,snd_usb_audio,snd_usbmidi_lib,snd_timer,snd_pcm,snd_rawmidi soundcore 16384 1 snd mc 69632 1 snd_usb_audio Since I'm running pipewire and the nodes are pw-cli ls Node id 28, type PipeWire:Interface:Node/3 object.serial = "28" factory.id = "10" priority.driver = "20000" node.name = "Dummy-Driver" id 29, type PipeWire:Interface:Node/3 object.serial = "29" factory.id = "10" priority.driver = "19000" node.name = "Freewheel-Driver" id 31, type PipeWire:Interface:Node/3 object.serial = "1736" object.path = "alsa:pcm:0:front:0:playback" factory.id = "18" client.id = "33" device.id = "44" priority.session = "1009" priority.driver = "1009" node.description = "PCM2902 Audio Codec Analog Stereo" node.name = "alsa_output.usb-Burr-Brown_from_TI_USB_Audio_CODEC-00.analog-stereo-output" node.nick = "USB Audio CODEC" media.class = "Audio/Sink" id 37, type PipeWire:Interface:Node/3 object.serial = "35" factory.id = "10" client.id = "33" node.name = "Midi-Bridge" media.class = "Midi/Bridge" id 42, type PipeWire:Interface:Node/3 object.serial = "1737" object.path = "alsa:pcm:0:hw:0:capture" factory.id = "18" client.id = "33" device.id = "44" priority.session = "2009" priority.driver = "2009" node.description = "PCM2902 Audio Codec Analog Stereo" node.name = "alsa_input.usb-Burr-Brown_from_TI_USB_Audio_CODEC-00.analog-stereo-input" node.nick = "USB Audio CODEC" media.class = "Audio/Source" I also tried a simple speaker test: speaker-test -c 2 speaker-test 1.2.8 Playback device is default Stream parameters are 48000Hz, S16_LE, 2 channels Using 16 octaves of pink noise Rate set to 48000Hz (requested 48000Hz) Buffer size range from 64 to 1048576 Period size range from 32 to 524288 Using max buffer size 1048576 Periods = 4 was set period_size = 262144 was set buffer_size = 1048576 0 - Front Left 1 - Front Right Time per period = 11.005656 0 - Front Left ^C 1 - Front Right Time per period = 5.263193 And I checked the aplay devices aplay -l **** List of PLAYBACK Hardware Devices **** card 0: CODEC [USB Audio CODEC], device 0: USB Audio [USB Audio] Subdevices: 1/1 Subdevice #0: subdevice #0 aplay -L null Discard all samples (playback) or generate zero samples (capture) sysdefault Default Audio Device oss Open Sound System pipewire PipeWire Sound Server default Default ALSA Output (currently PipeWire Media Server) sysdefault:CARD=CODEC USB Audio CODEC, USB Audio Default Audio Device front:CARD=CODEC,DEV=0 USB Audio CODEC, USB Audio Front output / input surround21:CARD=CODEC,DEV=0 USB Audio CODEC, USB Audio 2.1 Surround output to Front and Subwoofer speakers surround40:CARD=CODEC,DEV=0 USB Audio CODEC, USB Audio 4.0 Surround output to Front and Rear speakers surround41:CARD=CODEC,DEV=0 USB Audio CODEC, USB Audio 4.1 Surround output to Front, Rear and Subwoofer speakers surround50:CARD=CODEC,DEV=0 USB Audio CODEC, USB Audio 5.0 Surround output to Front, Center and Rear speakers surround51:CARD=CODEC,DEV=0 USB Audio CODEC, USB Audio 5.1 Surround output to Front, Center, Rear and Subwoofer speakers surround71:CARD=CODEC,DEV=0 USB Audio CODEC, USB Audio 7.1 Surround output to Front, Center, Side, Rear and Woofer speakers iec958:CARD=CODEC,DEV=0 USB Audio CODEC, USB Audio IEC958 (S/PDIF) Digital Audio Output And alsa mixer says volume levels are up: amixer Simple mixer control 'Master',0 Capabilities: pvolume pswitch pswitch-joined Playback channels: Front Left - Front Right Limits: Playback 0 - 65536 Mono: Front Left: Playback 55864 [85%] [on] Front Right: Playback 55864 [85%] [on] Simple mixer control 'Capture',0 Capabilities: cvolume cswitch cswitch-joined Capture channels: Front Left - Front Right Limits: Capture 0 - 65536 Front Left: Capture 26213 [40%] [on] Front Right: Capture 26213 [40%] [on] I've never seen this before and I'm not sure how to diagnose this. Btw, I confirmed my speakers work fine (hear buzz when I touch the audio cable connections).

My AlmaLinux9 server has been running great for months, playing audio through a USB device which was detected during installation. After a recent reboot I can no longer play audio because my app reports no sounds cards. dmesg shows detection of my sound card: [ 2.035043] usb 3-1.2.2: new full-speed USB device number 4 using xhci_hcd [ 2.102248] usb 2-2.1: new full-speed USB device number 4 using uhci_hcd [ 2.169381] usb 3-1.2.2: New USB device found, idVendor=08bb, idProduct=2902, bcdDevice= 1.00 [ 2.169389] usb 3-1.2.2: New USB device strings: Mfr=1, Product=2, SerialNumber=0 [ 2.169394] usb 3-1.2.2: Product: USB Audio CODEC [ 2.169399] usb 3-1.2.2: Manufacturer: Burr-Brown from TI [ 2.174145] input: Burr-Brown from TI USB Audio CODEC as /devices/pci0000:00/0000:00:17.0/0000:13:00.0/usb3/3-1/3-1.2/3-1.2.2/3-1.2.2:1.3/0003:08BB:2902.0002/input/input6 [ 2.225293] hid-generic 0003:08BB:2902.0002: input,hidraw1: USB HID v1.00 Device [Burr-Brown from TI USB Audio CODEC ] on usb-0000:13:00.0-1.2.2/input3 Yet Linux doesn't see this as a sound card: aplay -l aplay: device_list:274: no soundcards found... What happened? And how do I fix this?

I have a BT audio device: $ lsusb Bus 005 Device 005: ID 0a12:1275 Cambridge Silicon Radio, Ltd HaiSenKeJi Bus 005 Device 004: ID 0a12:4010 Cambridge Silicon Radio, Ltd In sound settings I can select it for output: Now the problem is that I can't get any GUI to show which speaker is my computer connected to. I installed *everything* I found: bluetooth*, bluez*, pulseaudio-module-bluetooth, blueman*. However, normal bluetooth commands doesn't work as they can't find an adapter. What am I supposed to do to get some GUI?

I recently bought a USB headset and it has been behaving very inconsistently. Sometimes it works fine but other times, if I try to play any media, it acts as if it is buffering until I unplug the headset. Running speaker-test (both with and without -c2) either hangs or produces the error Write error: -77,File descriptor in bad state. The latter I haven't been able to reproduce since installing sof-firmware, but this hasn't helped in any other way. My headset is EPOS H3 Hybrid and my laptop is a Dell G15 Ryzen Edition. For my audio, I use PireWire with Wireplumber, as compatibility, pipewire-pulse, pipewire-alsa, and pipewire-jack. Whenever I play audio, journalctl seems to fill with spa.alsa: front:3: (250 missed) snd_pcm_avail after recover: Broken pipe. Additionally, my laptop speakers don't seem to work at the moment but media will still play. Does anyone know how this could be fixed?

I`m running Debian 11 on an Asus X750L laptop. I have an M-Audio Fast Track C400 USB Audio Interface. If I restart or shut down the laptop after I turn it on in sound settings there is a signal but there is no sound out on the speakers. Has anyone had a similar experience?

I have a Roland TD-30 drum connected using USB to my computer. The USB device support MIDI and audio input/output. Currently Linux does see the USB card. aplay -l shows: kaart 2: TD30 [TD-30], apparaat 0: USB Audio [USB Audio] Sub-apparaten: 1/1 Sub-apparaat #0: subdevice #0 When I call cat /proc/asound/card2/*, it shows me: TD30 TD-30 Output 0 Tx bytes : 0 Input 0 Rx bytes : 0 cat: /proc/asound/card2/pcm0c: Is een map cat: /proc/asound/card2/pcm0p: Is een map Roland TD-30 at usb-0000:00:14.0-10, full speed : USB Audio Playback: Status: Running Interface = 0 Altset = 1 Packet Size = 320 Momentary freq = 44100 Hz (0x2c.199a) Interface 0 Altset 1 Format: S24_3LE Channels: 2 Endpoint: 1 OUT (ADAPTIVE) Rates: 44100 Capture: Status: Running Interface = 1 Altset = 1 Packet Size = 320 Momentary freq = 44100 Hz (0x2c.199a) Interface 1 Altset 1 Format: S24_3LE Channels: 2 Endpoint: 2 IN (ASYNC) Rates: 44100 003/017 0582:0158 The midi input/output is working fine, but the audio input/output is not working at all. Alsamixer can only use the midi input/output. Does someone know I can fix this? I'm using Kubuntu 18.10. I got sound out of my usb device by booting Kubuntu with the audio device ON and plugged. Just after boot it works fine, but after a few minutes it stops and a reboot is needed. Can this be solved?

This headset works exactly as expected in non-linux operating systems (e.g. macOS, Windows) such that the volume control smoothly adjusts the loudness of the headset all the way from 0 to 100. In every version of Linux I've tried (e.g. Linux Mint), anything below 25% volume results in complete silence, and anything above 33% volume is ear-splittingly loud, leaving almost no resolution for fine-tuning. I've tried using alsamixer and pavucontrol to explore the available volume levels, with no change in behavior. How can I achieve fine-grained control of this USB headset in Linux?

I have a Traktor Kontrol S5 and I really need to use it with Linux (in my case Linux Mint). Also, Im new to Linux. The problem is that, even if Ive installed the driver, the MIDI part of the controller doesnt work, while the audio part does. So if I want to play audio through it, it works, but MIDI wise seems disconnected. I tried running the command amidi -l and the interface doesnt show. But if I run cat /proc/asound/cards the USB sound card works. I have no idea how to fix it, and I cant find anything similar online. I tried dmesg In the output I found: [ 2611.444069] hid-generic 0003:17CC:1420.0005: hiddev0,hidraw4: USB HID v1.10 Device [Native Instruments Traktor Kontrol S5] on usb-0000:00:14.0-1/input3 [ 2625.321568] xhci_hcd 0000:00:14.0: ERROR Transfer event TRB DMA ptr not part of current TD ep_index 1 comp_code 1 [ 2625.321589] xhci_hcd 0000:00:14.0: Looking for event-dma 00000001a4aa8ea0 trb-start 00000001a4aa8eb0 trb-end 00000001a4aa8eb0 seg-start 00000001a4aa8000 seg-end 00000001a4aa8ff0 [ 2625.321692] usb 1-2: USB disconnect, device number 6 [ 2625.321815] xhci_hcd 0000:00:14.0: ERROR Transfer event TRB DMA ptr not part of current TD ep_index 1 comp_code 1 [ 2625.321828] xhci_hcd 0000:00:14.0: Looking for event-dma 00000001a4aa8eb0 trb-start 00000001a4aa8ec0 trb-end 00000001a4aa8ec0 seg-start 00000001a4aa8000 seg-end 00000001a4aa8ff0 [ 2625.321845] xhci_hcd 0000:00:14.0: ERROR Transfer event TRB DMA ptr not part of current TD ep_index 1 comp_code 1 [ 2625.321855] xhci_hcd 0000:00:14.0: Looking for event-dma 00000001a4aa8ec0 trb-start 00000001a4aa8ed0 trb-end 00000001a4aa8ed0 seg-start 00000001a4aa8000 seg-end 00000001a4aa8ff0 [ 2625.322190] xhci_hcd 0000:00:14.0: ERROR Transfer event TRB DMA ptr not part of current TD ep_index 1 comp_code 1 [ 2625.322204] xhci_hcd 0000:00:14.0: Looking for event-dma 00000001a4aa8ed0 trb-start 00000001a4aa8ee0 trb-end 00000001a4aa8ee0 seg-start 00000001a4aa8000 seg-end 00000001a4aa8ff0 [ 2625.322219] xhci_hcd 0000:00:14.0: ERROR Transfer event TRB DMA ptr not part of current TD ep_index 1 comp_code 1 [ 2625.322229] xhci_hcd 0000:00:14.0: Looking for event-dma 00000001a4aa8ee0 trb-start 00000001a4aa8ef0 trb-end 00000001a4aa8ef0 seg-start 00000001a4aa8000 seg-end 00000001a4aa8ff0 [ 2625.322243] xhci_hcd 0000:00:14.0: ERROR Transfer event TRB DMA ptr not part of current TD ep_index 1 comp_code 1 [ 2625.322252] xhci_hcd 0000:00:14.0: Looking for event-dma 00000001a4aa8ef0 trb-start 00000001a4aa8f00 trb-end 00000001a4aa8f00 seg-start 00000001a4aa8000 seg-end 00000001a4aa8ff0 [ 2625.322523] xhci_hcd 0000:00:14.0: ERROR Transfer event TRB DMA ptr not part of current TD ep_index 1 comp_code 1 [ 2625.322534] xhci_hcd 0000:00:14.0: Looking for event-dma 00000001a4aa8f00 trb-start 00000001a4aa8f10 trb-end 00000001a4aa8f10 seg-start 00000001a4aa8000 seg-end 00000001a4aa8ff0 [ 2625.322549] xhci_hcd 0000:00:14.0: ERROR Transfer event TRB DMA ptr not part of current TD ep_index 1 comp_code 1 [ 2625.322558] xhci_hcd 0000:00:14.0: Looking for event-dma 00000001a4aa8f10 trb-start 00000001a4aa8f20 trb-end 00000001a4aa8f20 seg-start 00000001a4aa8000 seg-end 00000001a4aa8ff0 [ 2625.322592] xhci_hcd 0000:00:14.0: ERROR Transfer event TRB DMA ptr not part of current TD ep_index 1 comp_code 1 Just for the record, I also have a MIDI keyboard and actually works fine Any help would be awesome, thanks in advance

I dual-boot Windows and Ubuntu 22.04.01 LTS. In Windows, my audio device (Tascam US-2x2HR) works well. In Ubuntu, it does not work on boot, but if I repeatedly unplug it and plug it back in, it will eventually work perfectly. Sometimes, when I plug it in, it seems to partially hang the computer (e.g. I can click on the button to open a terminal) but the terminal does not open until I unplug the audio device. Here are the best log snippets I know how to find. Happy to provide additional info of course! Here is a snippet from dmesg that seems to have some relevant information. [ 425.021608] pcieport 0000:00:03.2: AER: Corrected error received: 0000:00:03.2 [ 425.021622] pcieport 0000:00:03.2: PCIe Bus Error: severity=Corrected, type=Physical Layer, (Receiver ID) [ 425.021626] pcieport 0000:00:03.2: device [8086:2f0a] error status/mask=00000001/00002000 [ 425.021643] pcieport 0000:00:03.2: [ 0] RxErr [ 429.346228] usb 3-3: 1:0: usb_set_interface failed (-110) [ 434.462227] usb 3-3: 1:0: usb_set_interface failed (-110) [ 439.610209] usb 3-3: 1:1: cannot get freq (v2/v3): err -110 [ 444.730280] usb 3-3: 1:1: cannot set freq 44100 (v2/v3): err -110 [ 449.822347] usb 3-3: 1:0: usb_set_interface failed (-110) [ 454.942400] usb 3-3: 1:0: usb_set_interface failed (-110) [ 460.090325] usb 3-3: 1:1: cannot get freq (v2/v3): err -110 And when I tail -f /var/log/syslog this is what happens after I plug in the device and it fails. Nov 14 08:13:32 desktop kernel: [ 1429.572860] usb 3-3: new high-speed USB device number 10 using xhci_hcd Nov 14 08:13:32 desktop kernel: [ 1429.721386] usb 3-3: New USB device found, idVendor=0644, idProduct=8070, bcdDevice= 1.00 Nov 14 08:13:32 desktop kernel: [ 1429.721394] usb 3-3: New USB device strings: Mfr=1, Product=2, SerialNumber=3 Nov 14 08:13:32 desktop kernel: [ 1429.721398] usb 3-3: Product: US-2x2HR Nov 14 08:13:32 desktop kernel: [ 1429.721401] usb 3-3: Manufacturer: TASCAM Nov 14 08:13:32 desktop kernel: [ 1429.721404] usb 3-3: SerialNumber: no serial number Nov 14 08:13:37 desktop kernel: [ 1434.973026] usb 3-3: parse_audio_format_rates_v2v3(): unable to retrieve number of sample rates (clock 1) Nov 14 08:14:32 desktop systemd-udevd: 3-3: Worker processing SEQNUM=6118 is taking a long time Nov 14 08:14:44 desktop mtp-probe: checking bus 3, device 10: "/sys/devices/pci0000:00/0000:00:14.0/usb3/3-3" Nov 14 08:14:44 desktop mtp-probe: bus: 3, device: 10 was not an MTP device Nov 14 08:14:44 desktop mtp-probe: checking bus 3, device 10: "/sys/devices/pci0000:00/0000:00:14.0/usb3/3-3" Nov 14 08:14:44 desktop mtp-probe: bus: 3, device: 10 was not an MTP device Nov 14 08:14:49 desktop kernel: [ 1506.627314] usb 3-3: 1:0: usb_set_interface failed (-110) Nov 14 08:14:54 desktop kernel: [ 1511.775449] usb 3-3: 1:1: cannot get freq (v2/v3): err -110 Nov 14 08:14:59 desktop kernel: [ 1516.895577] usb 3-3: 1:1: cannot set freq 44100 (v2/v3): err -110 Nov 14 08:15:04 desktop kernel: [ 1521.987790] usb 3-3: 1:0: usb_set_interface failed (-110) Nov 14 08:15:09 desktop kernel: [ 1527.107948] usb 3-3: 1:0: usb_set_interface failed (-110) Sometimes the device shows up in lsusb (even if it is not working properly) and sometimes running lsusb freezes the terminal until I unplug the device (or wait a long time). And finally, here is the syslog content after a succcessful unplug/plug. The device works fine after this. Nov 14 09:30:01 desktop CRON: (root) CMD ([ -x /etc/init.d/anacron ] && if [ ! -d /run/systemd/system ]; then /usr/sbin/invoke-rc.d anacron start >/dev/null; fi) Nov 14 09:30:27 desktop kernel: [ 6044.374629] usb 3-3: new high-speed USB device number 18 using xhci_hcd Nov 14 09:30:27 desktop kernel: [ 6044.523123] usb 3-3: New USB device found, idVendor=0644, idProduct=8070, bcdDevice= 1.00 Nov 14 09:30:27 desktop kernel: [ 6044.523134] usb 3-3: New USB device strings: Mfr=1, Product=2, SerialNumber=3 Nov 14 09:30:27 desktop kernel: [ 6044.523138] usb 3-3: Product: US-2x2HR Nov 14 09:30:27 desktop kernel: [ 6044.523141] usb 3-3: Manufacturer: TASCAM Nov 14 09:30:27 desktop kernel: [ 6044.523143] usb 3-3: SerialNumber: no serial number Nov 14 09:30:27 desktop mtp-probe: checking bus 3, device 18: "/sys/devices/pci0000:00/0000:00:14.0/usb3/3-3" Nov 14 09:30:27 desktop mtp-probe: bus: 3, device: 18 was not an MTP device Nov 14 09:30:27 desktop systemd-udevd: controlC3: Process '/usr/sbin/alsactl -E HOME=/run/alsa -E XDG_RUNTIME_DIR=/run/alsa/runtime restore 3' failed with exit code 99. Nov 14 09:30:27 desktop mtp-probe: checking bus 3, device 18: "/sys/devices/pci0000:00/0000:00:14.0/usb3/3-3" Nov 14 09:30:27 desktop mtp-probe: bus: 3, device: 18 was not an MTP device Nov 14 09:30:29 desktop kernel: [ 6046.861313] retire_capture_urb: 2 callbacks suppressed Nov 14 09:30:29 desktop gsd-media-keys: Unable to get default source Nov 14 09:30:52 desktop systemd: Started Application launched by gsd-media-keys. Nov 14 09:30:53 desktop systemd: Started VTE child process 13205 launched by gnome-terminal-server process 3364.

When I connect my PreSonus USB AudioBox 96 to my Ubuntu 18.04LTS desktop via USB2.0 port, dmesg shows the following errors in a loop:

[ 8764.468004] usb 1-11: new high-speed USB device number 61 using xhci_hcd
[ 8764.516953] usb 1-11: New USB device found, idVendor=194f, idProduct=0303, bcdDevice= 1.12
[ 8764.516955] usb 1-11: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[ 8764.516957] usb 1-11: Product: AudioBox USB 96
[ 8764.516958] usb 1-11: Manufacturer: PreSonus
[ 8764.516959] usb 1-11: SerialNumber: 000000000000
[ 8769.723951] usb 1-11: 1:1: cannot set freq 96000 (v2/v3): err -110
[ 8774.843735] usb 1-11: parse_audio_format_rates_v2v3(): unable to retrieve number of sample rates (clock 5)
[ 8820.921855] usb 1-11: USB disconnect, device number 61
[ 8821.065655] debugfs: Directory '56' with parent 'devices' already present!
[ 8821.193535] usb 1-11: new high-speed USB device number 62 using xhci_hcd
[ 8821.242166] usb 1-11: New USB device found, idVendor=194f, idProduct=0303, bcdDevice= 1.12
[ 8821.242168] usb 1-11: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[ 8821.242170] usb 1-11: Product: AudioBox USB 96
[ 8821.242171] usb 1-11: Manufacturer: PreSonus
[ 8821.242172] usb 1-11: SerialNumber: 000000000000
[ 8831.417276] usb 1-11: uac_clock_source_is_valid(): cannot get clock validity for id 5
[ 8836.537052] usb 1-11: parse_audio_format_rates_v2v3(): unable to retrieve number of sample rates (clock 5)
[ 8882.615203] usb 1-11: USB disconnect, device number 62
[ 8882.763151] debugfs: Directory '57' with parent 'devices' already present!
[ 8882.890909] usb 1-11: new high-speed USB device number 63 using xhci_hcd
[ 8882.919108] usb 1-11: device descriptor read/8, error -71
[ 8883.055305] usb 1-11: device descriptor read/8, error -71
[ 8883.163566] debugfs: Directory '58' with parent 'devices' already present!
[ 8883.498882] usb 1-11: new high-speed USB device number 64 using xhci_hcd
[ 8883.547227] usb 1-11: New USB device found, idVendor=194f, idProduct=0303, bcdDevice= 1.12
[ 8883.547229] usb 1-11: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[ 8883.547231] usb 1-11: Product: AudioBox USB 96
[ 8883.547232] usb 1-11: Manufacturer: PreSonus
[ 8883.547233] usb 1-11: SerialNumber: 000000000000
[ 8883.657682] usb 1-11: USB disconnect, device number 64

I suspect the failure is at [this](https://github.com/torvalds/linux/blob/50cc09c18985eacbbd666acfd7be2391394733f5/sound/usb/format.c#L398) line of the linux kernel. The interface is intermittently available as an input source in alsamixer. It will be available for a few seconds, then disappear, reappear, etc. The device works fine on my Windows machine. Does anyone have any advice for how to debug/resolve this issue? I've included the output of lsusb -v below.

Bus 001 Device 041: ID 194f:0303 PreSonus Audio Electronics, Inc. 
Couldn't open device, some information will be missing
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               2.00
  bDeviceClass            0 (Defined at Interface level)
  bDeviceSubClass         0 
  bDeviceProtocol         0 
  bMaxPacketSize0        64
  idVendor           0x194f PreSonus Audio Electronics, Inc.
  idProduct          0x0303 
  bcdDevice            1.12
  iManufacturer           1 
  iProduct                2 
  iSerial                 3 
  bNumConfigurations      1
  Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength          328
    bNumInterfaces          6
    bConfigurationValue     1
    iConfiguration          0 
    bmAttributes         0x80
      (Bus Powered)
    MaxPower              500mA
    Interface Association:
      bLength                 8
      bDescriptorType        11
      bFirstInterface         0
      bInterfaceCount         3
      bFunctionClass          1 Audio
      bFunctionSubClass       0 
      bFunctionProtocol      32 
      iFunction               0 
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       0
      bNumEndpoints           0
      bInterfaceClass         1 Audio
      bInterfaceSubClass      1 Control Device
      bInterfaceProtocol     32 
      iInterface             16 
      AudioControl Interface Descriptor:
        bLength                 9
        bDescriptorType        36
        bDescriptorSubtype      1 (HEADER)
        bcdADC               2.00
        bCategory               8
        wTotalLength           75
        bmControl            0x01
          Latency control Control (read-only)
      AudioControl Interface Descriptor:
        bLength                 8
        bDescriptorType        36
        bDescriptorSubtype     10 (CLOCK_SOURCE)
        bClockID                5
        bmAttributes         0x03 Internal programmable Clock 
        bmControls           0x07
          Clock Frequency Control (read/write)
          Clock Validity Control (read-only)
        bAssocTerminal          0
        iClockSource            0 
      AudioControl Interface Descriptor:
        bLength                17
        bDescriptorType        36
        bDescriptorSubtype      2 (INPUT_TERMINAL)
        bTerminalID             1
        wTerminalType      0x0603 Line Connector
        bAssocTerminal          0
        bCSourceID              5
        bNrChannels             2
        bmChannelConfig   0x00000000
        bmControls    0x0000
        iChannelNames          32 
        iTerminal               0 
      AudioControl Interface Descriptor:
        bLength                12
        bDescriptorType        36
        bDescriptorSubtype      3 (OUTPUT_TERMINAL)
        bTerminalID             2
        wTerminalType      0x0101 USB Streaming
        bAssocTerminal          0
        bSourceID               1
        bCSourceID              5
        bmControls         0x0000
        iTerminal               0 
      AudioControl Interface Descriptor:
        bLength                17
        bDescriptorType        36
        bDescriptorSubtype      2 (INPUT_TERMINAL)
        bTerminalID             3
        wTerminalType      0x0101 USB Streaming
        bAssocTerminal          0
        bCSourceID              5
        bNrChannels             2
        bmChannelConfig   0x00000000
        bmControls    0x0000
        iChannelNames          48 
        iTerminal               0 
      AudioControl Interface Descriptor:
        bLength                12
        bDescriptorType        36
        bDescriptorSubtype      3 (OUTPUT_TERMINAL)
        bTerminalID             4
        wTerminalType      0x0301 Speaker
        bAssocTerminal          0
        bSourceID               3
        bCSourceID              5
        bmControls         0x0000
        iTerminal               0 
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        1
      bAlternateSetting       0
      bNumEndpoints           0
      bInterfaceClass         1 Audio
      bInterfaceSubClass      2 Streaming
      bInterfaceProtocol     32 
      iInterface             17 
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        1
      bAlternateSetting       1
      bNumEndpoints           1
      bInterfaceClass         1 Audio
      bInterfaceSubClass      2 Streaming
      bInterfaceProtocol     32 
      iInterface             17 
      AudioStreaming Interface Descriptor:
        bLength                16
        bDescriptorType        36
        bDescriptorSubtype      1 (AS_GENERAL)
        bTerminalLink           2
        bmControls           0x00
        bFormatType             1
        bmFormats         0x00000001
          PCM
        bNrChannels             2
        bmChannelConfig   0x00000000
        iChannelNames          32 
      AudioStreaming Interface Descriptor:
        bLength                 6
        bDescriptorType        36
        bDescriptorSubtype      2 (FORMAT_TYPE)
        bFormatType             1 (FORMAT_TYPE_I)
        bSubslotSize            4
        bBitResolution         24
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x81  EP 1 IN
        bmAttributes            5
          Transfer Type            Isochronous
          Synch Type               Asynchronous
          Usage Type               Data
        wMaxPacketSize     0x0068  1x 104 bytes
        bInterval               1
        AudioControl Endpoint Descriptor:
          bLength                 8
          bDescriptorType        37
          bDescriptorSubtype      1 (EP_GENERAL)
          bmAttributes         0x00
          bmControls           0x00
          bLockDelayUnits         0 Undefined
          wLockDelay              0
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        2
      bAlternateSetting       0
      bNumEndpoints           0
      bInterfaceClass         1 Audio
      bInterfaceSubClass      2 Streaming
      bInterfaceProtocol     32 
      iInterface             18 
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        2
      bAlternateSetting       1
      bNumEndpoints           2
      bInterfaceClass         1 Audio
      bInterfaceSubClass      2 Streaming
      bInterfaceProtocol     32 
      iInterface             18 
      AudioStreaming Interface Descriptor:
        bLength                16
        bDescriptorType        36
        bDescriptorSubtype      1 (AS_GENERAL)
        bTerminalLink           3
        bmControls           0x00
        bFormatType             1
        bmFormats         0x00000001
          PCM
        bNrChannels             2
        bmChannelConfig   0x00000000
        iChannelNames          48 
      AudioStreaming Interface Descriptor:
        bLength                 6
        bDescriptorType        36
        bDescriptorSubtype      2 (FORMAT_TYPE)
        bFormatType             1 (FORMAT_TYPE_I)
        bSubslotSize            4
        bBitResolution         24
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x01  EP 1 OUT
        bmAttributes            5
          Transfer Type            Isochronous
          Synch Type               Asynchronous
          Usage Type               Data
        wMaxPacketSize     0x0068  1x 104 bytes
        bInterval               1
        AudioControl Endpoint Descriptor:
          bLength                 8
          bDescriptorType        37
          bDescriptorSubtype      1 (EP_GENERAL)
          bmAttributes         0x00
          bmControls           0x00
          bLockDelayUnits         0 Undefined
          wLockDelay              0
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x82  EP 2 IN
        bmAttributes           17
          Transfer Type            Isochronous
          Synch Type               None
          Usage Type               Feedback
        wMaxPacketSize     0x0004  1x 4 bytes
        bInterval               4
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        3
      bAlternateSetting       0
      bNumEndpoints           0
      bInterfaceClass         1 Audio
      bInterfaceSubClass      1 Control Device
      bInterfaceProtocol      0 
      iInterface             16 
      AudioControl Interface Descriptor:
        bLength                 9
        bDescriptorType        36
        bDescriptorSubtype      1 (HEADER)
        bcdADC               1.00
        wTotalLength            9
        bInCollection           1
        baInterfaceNr( 0)       4
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        4
      bAlternateSetting       0
      bNumEndpoints           2
      bInterfaceClass         1 Audio
      bInterfaceSubClass      3 MIDI Streaming
      bInterfaceProtocol      0 
      iInterface              0 
      MIDIStreaming Interface Descriptor:
        bLength                 7
        bDescriptorType        36
        bDescriptorSubtype      1 (HEADER)
        bcdADC               1.00
        wTotalLength           65
      MIDIStreaming Interface Descriptor:
        bLength                 6
        bDescriptorType        36
        bDescriptorSubtype      2 (MIDI_IN_JACK)
        bJackType               1 Embedded
        bJackID                 1
        iJack                   0 
      MIDIStreaming Interface Descriptor:
        bLength                 6
        bDescriptorType        36
        bDescriptorSubtype      2 (MIDI_IN_JACK)
        bJackType               2 External
        bJackID                 2
        iJack                   0 
      MIDIStreaming Interface Descriptor:
        bLength                 9
        bDescriptorType        36
        bDescriptorSubtype      3 (MIDI_OUT_JACK)
        bJackType               1 Embedded
        bJackID                 3
        bNrInputPins            1
        baSourceID( 0)          2
        BaSourcePin( 0)         1
        iJack                   0 
      MIDIStreaming Interface Descriptor:
        bLength                 9
        bDescriptorType        36
        bDescriptorSubtype      3 (MIDI_OUT_JACK)
        bJackType               2 External
        bJackID                 4
        bNrInputPins            1
        baSourceID( 0)          1
        BaSourcePin( 0)         1
        iJack                   0 
      Endpoint Descriptor:
        bLength                 9
        bDescriptorType         5
        bEndpointAddress     0x02  EP 2 OUT
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0200  1x 512 bytes
        bInterval               0
        bRefresh                0
        bSynchAddress           0
        MIDIStreaming Endpoint Descriptor:
          bLength                 5
          bDescriptorType        37
          bDescriptorSubtype      1 (GENERAL)
          bNumEmbMIDIJack         1
          baAssocJackID( 0)       1
      Endpoint Descriptor:
        bLength                 9
        bDescriptorType         5
        bEndpointAddress     0x83  EP 3 IN
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0200  1x 512 bytes
        bInterval               0
        bRefresh                0
        bSynchAddress           0
        MIDIStreaming Endpoint Descriptor:
          bLength                 5
          bDescriptorType        37
          bDescriptorSubtype      1 (GENERAL)
          bNumEmbMIDIJack         1
          baAssocJackID( 0)       3
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        5
      bAlternateSetting       0
      bNumEndpoints           0
      bInterfaceClass       254 Application Specific Interface
      bInterfaceSubClass      1 Device Firmware Update
      bInterfaceProtocol      2 
      iInterface             80 
      Device Firmware Upgrade Interface Descriptor:
        bLength                             9
        bDescriptorType                    33
        bmAttributes                       13
          Will Detach
          Manifestation Tolerant
          Upload Unsupported
          Download Supported
        wDetachTimeout                   2000 milliseconds
        wTransferSize                    1024 bytes
        bcdDFUVersion                   1.10

I am having intermittent issues with the output going silent on a USB sound card. Note that this affects both an Apple audio dongle and a Ugreen sound card, two very different chipsets, in the same way, ruling out a hardware issue. I noticed that unplugging the USB cable and plugging it into another USB socket often fixes the problem, but not always. Rebooting also fixes it temporarily. Sometimes, I can be listening to audio, and I momentarily pause my video or audio app or even skip/scrub backwards and then the problem will come back and all audio will be silent. Weirdly, I've noticed that if the Pulseaudio volume control applet is open, the problem for now isn't occurring, and sometimes, if the problem happens and I start that applet, sometimes it fixes the issue (but not always, and sometimes nothing I do in the pulseaudio applet can fix it). Things I've checked: - Pulseaudio is showing correct output device, and the VU meter is showing the audio is playing on it, and it's not muted, but nothing is heard. - Alsamixer shows nothing is muted on the relevant audio device - It affects various software that plays audio, and when it happens, it appears to happen to all software that is playing to that device. - lsusb and similar show nothing odd about the USB device, which is still recognised, and there is nothing in dmesg to indicate a problem with it. - Even when the problem of no audio output is occurring, pulseaudio is correctly detecting the device being plugged and unplugged and the type of device it is. Using Debian stable with Gnome desktop, pulseaudio config is pretty vanilla