<html><head></head><body><div style="font-family: Verdana;font-size: 12.0px;"><div>Dear experts,</div> <div> </div> <div>I already tried to get some help via https://unix.stackexchange.com/questions/675121/sound-via-jack-is-totaly-distorted-pulseaudio-without-jack-works as well as in the german forum https://forum.ubuntuusers.de/topic/audio-ausgabe-bei-nutzung-von-jack-voellig-ueb/2/#post-9282854 unfortunatelly with no success although in the german forum many things were discussed.</div> <div>So I decided to do a total fresh install of my Ubuntu Studio 21.10 but my problem still exists: The sound via JACK is totally distorted while the output with PulseAudio is ok. So now I would like to know, which posibilities there are to adjust JACKs output or if there is a bug and I only have to wait for a fix.</div> <div> <div class="s-prose js-post-body" itemprop="text"> <p>First of all, here is the information about my system (Ubuntu Studio 21.10) - in advance: The sound output is completely distorted as soon as Jack is activated (regardless of whether via JackDBus or JackD), although it was still working without any problems until a few days ago:</p> <pre><code>silvermoon@ubuntupc:~$ lsb_release -d Description: Ubuntu 21.10 silvermoon@ubuntupc:~$ uname -r 5.13.0-20-lowlatency silvermoon@ubuntupc:~$ cat /proc/asound/cards 0 [sofhdadsp ]: sof-hda-dsp - sof-hda-dsp LENOVO-20QF0027GE-ThinkPadX1Yoga4th 1 [AUDIO ]: USB-Audio - CONEXANT USB AUDIO Conexant CONEXANT USB AUDIO at usb-0000:0a:00.0-2.1.1.2, full speed silvermoon@ubuntupc:~$ aplay -l **** Liste der Hardware-Geräte (PLAYBACK) **** Karte 0: sofhdadsp [sof-hda-dsp], Gerät 0: HDA Analog (*) [] Sub-Geräte: 1/1 Sub-Gerät #0: subdevice #0 Karte 0: sofhdadsp [sof-hda-dsp], Gerät 1: HDA Digital (*) [] Sub-Geräte: 1/1 Sub-Gerät #0: subdevice #0 Karte 0: sofhdadsp [sof-hda-dsp], Gerät 3: HDMI1 (*) [] Sub-Geräte: 1/1 Sub-Gerät #0: subdevice #0 Karte 0: sofhdadsp [sof-hda-dsp], Gerät 4: HDMI2 (*) [] Sub-Geräte: 1/1 Sub-Gerät #0: subdevice #0 Karte 0: sofhdadsp [sof-hda-dsp], Gerät 5: HDMI3 (*) [] Sub-Geräte: 1/1 Sub-Gerät #0: subdevice #0 Karte 1: AUDIO [CONEXANT USB AUDIO], Gerät 0: USB Audio [USB Audio] Sub-Geräte: 1/1 Sub-Gerät #0: subdevice #0 silvermoon@ubuntupc:~$ aplay /usr/share/sounds/alsa/Noise.wav Wiedergabe: WAVE '/usr/share/sounds/alsa/Noise.wav' : Signed 16 bit Little Endian, Rate: 48000 Hz, mono silvermoon@ubuntupc:~$ lspci -nnk | grep -iA2 audio 00:1f.3 Audio device [0403]: Intel Corporation Cannon Point-LP High Definition Audio Controller [8086:9dc8] (rev 11) Subsystem: Lenovo Cannon Point-LP High Definition Audio Controller [17aa:2292] Kernel driver in use: sof-audio-pci-intel-cnl Kernel modules: snd_hda_intel, snd_sof_pci_intel_cnl 00:1f.4 SMBus [0c05]: Intel Corporation Cannon Point-LP SMBus Controller [8086:9da3] (rev 11) silvermoon@ubuntupc:~$ ps -C esd PID TTY TIME CMD silvermoon@ubuntupc:~$ ps -C arts PID TTY TIME CMD silvermoon@ubuntupc:~$ ps -C pulseaudio PID TTY TIME CMD 3654 ? 00:00:08 pulseaudio silvermoon@ubuntupc:~$ grep "^audio" /etc/group | grep "$USER" | wc -l 1 silvermoon@ubuntupc:~$ dpkg -l | tr -s " " | grep " alsa-" ii alsa-base 1.0.25+dfsg-0ubuntu7 all ALSA driver configuration files ii alsa-tools 1.2.2-1 amd64 Console based ALSA utilities for specific hardware ii alsa-tools-gui 1.2.2-1 amd64 GUI based ALSA utilities for specific hardware ii alsa-topology-conf 1.2.5.1-2 all ALSA topology configuration files ii alsa-ucm-conf 1.2.4-2ubuntu4 all ALSA Use Case Manager configuration files ii alsa-utils 1.2.4-1ubuntu4 amd64 Utilities for configuring and using ALSA silvermoon@ubuntupc:~$ lsmod | grep "snd" snd_seq_dummy 16384 0 snd_usb_audio 299008 0 snd_usbmidi_lib 36864 1 snd_usb_audio mc 57344 5 videodev,snd_usb_audio,videobuf2_v4l2,uvcvideo,videobuf2_common snd_ctl_led 24576 0 snd_soc_skl_hda_dsp 24576 5 snd_soc_intel_hda_dsp_common 20480 1 snd_soc_skl_hda_dsp snd_soc_hdac_hdmi 36864 1 snd_soc_skl_hda_dsp snd_hda_codec_hdmi 61440 1 snd_hda_codec_realtek 147456 1 snd_hda_codec_generic 81920 1 snd_hda_codec_realtek snd_soc_dmic 16384 1 snd_sof_pci_intel_cnl 16384 0 snd_sof_intel_hda_common 98304 1 snd_sof_pci_intel_cnl soundwire_intel 40960 1 snd_sof_intel_hda_common snd_sof_intel_hda 20480 1 snd_sof_intel_hda_common snd_sof_pci 20480 2 snd_sof_intel_hda_common,snd_sof_pci_intel_cnl snd_sof_xtensa_dsp 16384 1 snd_sof_intel_hda_common snd_sof 135168 2 snd_sof_pci,snd_sof_intel_hda_common snd_soc_hdac_hda 24576 1 snd_sof_intel_hda_common snd_hda_ext_core 32768 4 snd_sof_intel_hda_common,snd_soc_hdac_hdmi,snd_soc_hdac_hda,snd_sof_intel_hda snd_soc_acpi_intel_match 49152 2 snd_sof_intel_hda_common,snd_sof_pci_intel_cnl snd_soc_acpi 16384 2 snd_soc_acpi_intel_match,snd_sof_intel_hda_common snd_soc_core 294912 7 soundwire_intel,snd_sof,snd_sof_intel_hda_common,snd_soc_hdac_hdmi,snd_soc_hdac_hda,snd_soc_dmic,snd_soc_skl_hda_dsp snd_compress 28672 1 snd_soc_core ac97_bus 16384 1 snd_soc_core snd_pcm_dmaengine 16384 1 snd_soc_core snd_hda_intel 53248 0 snd_intel_dspcfg 28672 2 snd_hda_intel,snd_sof_intel_hda_common snd_intel_sdw_acpi 20480 2 snd_sof_intel_hda_common,snd_intel_dspcfg snd_hda_codec 147456 7 snd_hda_codec_generic,snd_hda_codec_hdmi,snd_hda_intel,snd_hda_codec_realtek,snd_soc_intel_hda_dsp_common,snd_soc_hdac_hda,snd_soc_skl_hda_dsp snd_hda_core 94208 11 snd_hda_codec_generic,snd_hda_codec_hdmi,snd_hda_intel,snd_hda_ext_core,snd_hda_codec,snd_hda_codec_realtek,snd_soc_intel_hda_dsp_common,snd_sof_intel_hda_common,snd_soc_hdac_hdmi,snd_soc_hdac_hda,snd_sof_intel_hda snd_hwdep 16384 2 snd_usb_audio,snd_hda_codec snd_pcm 122880 12 snd_hda_codec_hdmi,snd_hda_intel,snd_usb_audio,snd_hda_codec,soundwire_intel,snd_sof,snd_sof_intel_hda_common,snd_soc_hdac_hdmi,snd_compress,snd_soc_core,snd_hda_core,snd_pcm_dmaengine snd_seq_midi 20480 0 snd_seq_midi_event 16384 1 snd_seq_midi ledtrig_audio 16384 4 snd_ctl_led,snd_hda_codec_generic,snd_sof,thinkpad_acpi snd_rawmidi 36864 2 snd_seq_midi,snd_usbmidi_lib snd_seq 73728 7 snd_seq_midi,snd_seq_midi_event,snd_seq_dummy snd_seq_device 16384 3 snd_seq,snd_seq_midi,snd_rawmidi snd_timer 40960 2 snd_seq,snd_pcm snd 94208 31 snd_ctl_led,snd_hda_codec_generic,snd_seq,snd_seq_device,snd_hda_codec_hdmi,snd_hwdep,snd_hda_intel,snd_usb_audio,snd_usbmidi_lib,snd_hda_codec,snd_hda_codec_realtek,snd_timer,snd_soc_hdac_hdmi,snd_compress,thinkpad_acpi,snd_soc_core,snd_pcm,snd_soc_skl_hda_dsp,snd_rawmidi soundcore 16384 2 snd_ctl_led,snd silvermoon@ubuntupc:~$ head -n 3 /proc/asound/card0/codec#0 Codec: Realtek ALC285 Address: 0 AFG Function Id: 0x1 (unsol 1) silvermoon@ubuntupc:~$ head -n 3 /proc/asound/card0/codec97#0/ac97#0-0 head: '/proc/asound/card0/codec97#0/ac97#0-0' kann nicht zum Lesen geöffnet werden: Datei oder Verzeichnis nicht gefunden silvermoon@ubuntupc:~$ head -n 3 /proc/asound/card0/codec97#0/ac97#0-0+regs head: '/proc/asound/card0/codec97#0/ac97#0-0+regs' kann nicht zum Lesen geöffnet werden: Datei oder Verzeichnis nicht gefunden silvermoon@ubuntupc:~$ cat ~/.asoundrc cat: /home/silvermoon/.asoundrc: Datei oder Verzeichnis nicht gefunden silvermoon@ubuntupc:~$ cat ~/.asoundrc.asoundconf cat: /home/silvermoon/.asoundrc.asoundconf: Datei oder Verzeichnis nicht gefunden silvermoon@ubuntupc:~$ cat /etc/asound.conf cat: /etc/asound.conf: Datei oder Verzeichnis nicht gefunden silvermoon@ubuntupc:~$ cat .config/jack/conf.xml <?xml version="1.0"?>   <jack> <engine> <option name="driver">alsa</option> <option name="realtime">true</option> <option name="verbose">true</option> <option name="sync">false</option> <option name="self-connect-mode">a</option> </engine> <drivers> <driver name="loopback"> </driver> <driver name="netone"> </driver> <driver name="alsa"> <option name="device">hw:0</option> <option name="capture">hw:0</option> <option name="playback">hw:0</option> <option name="rate">48000</option> <option name="period">1008</option> <option name="nperiods">2</option> <option name="duplex">true</option> <option name="dither">n</option> <option name="midi-driver">raw</option> </driver> <driver name="dummy"> </driver> <driver name="firewire"> </driver> <driver name="net"> </driver> <driver name="alsarawmidi"> </driver> <driver name="proxy"> </driver> </drivers> <internals> <internal name="netmanager"> </internal> <internal name="audioadapter"> </internal> <internal name="profiler"> </internal> <internal name="netadapter"> </internal> </internals> </jack> silvermoon@ubuntupc:~$ </code></pre> <p>Note: In relation to the problem, it makes no difference whether frames / periods in Jack is set to this strange value of 1008 or 128 or 512 or 1024 or ... I've already tried a lot here.</p> <p><strong>Setting without Jack:</strong> Jack is inactive, <strong>L</strong>oudness<strong>L</strong>evel (LL) 100%, aplay Front_Center.wav, output normal via pulse audio without any distortion or clipping,</p> <p><strong>Settings below are with active jack</strong></p> <ul> <li>Setting 1: LL=100%, PulseAudioJackSink (PAJS)=100%, aplay via PulseAudioJackSink->system-playback, output is totaly distorted</li> <li>Setting 2: LL=100%, PAJS=20% (shortly before distortion), aplay output not nice but understandable ;-)</li> <li>Setting 3: LL=20%, Output MuseScore via Jack->system-playback, whereby the volume control in MuseScore is set to -79.5db (normal at approx. -25db): already distorted</li> <li>Setting 4: same setting as in #3 but LL=60%: output totaly distorted. Same effect if volume control in MuseScore is set to more than approx. -78db. Not only the output of PAJS and MuseScore, everything is distorted, especially if the soundsource using jack couldn't be leveled down itself.</li> </ul> <p>Without knowing what I might have changed and where there could changes be made: A short time ago (in any case with 21.04, but I also mean under 21.10) everything worked without any problems. Do you have any ideas where to change appropriate settings? I have already done the following:</p> <ul> <li>ALSA module reinstallation</li> <li>Complete reset of alsa and trying different levels of the alsamixer settings, although what is strange (for me) here: I don't have a PCM controller</li> <li>tried JackD instead of JackDBus</li> <li>reset of pulseaudio configuration</li> <li>total stop of pulseaudio while running Jack</li> <li>fresh installation of Ubuntu Studio 21.10</li> </ul> <p>Thanks in advance for any hint!</p> </div> </div></div></body></html>