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Parsa Mousavi
Asked: 2020-05-18 03:50:59 +0800 CST

Error initializing Jack audio server

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I wanted to start jack server with the command 

sudo jackd -r -d alsa -r 44100

But I got the following errors :

JACK server starting in non-realtime mode
self-connect-mode is "Don't restrict self connect requests"
audio_reservation_init
Acquire audio card Audio0
creating alsa driver ... hw:0|hw:0|1024|2|44100|0|0|nomon|swmeter|-|32bit
ALSA: Cannot open PCM device alsa_pcm for playback. Falling back to capture-only mode
Released audio card Audio0
audio_reservation_finish
Cannot initialize driver
JackServer::Open failed with -1
Failed to open server

I tried the solutions here and here .Those Didn't work for me.

I use jackd version 1.9 with linux kernel 5.3 in ubuntu bionic.

sound jack

1 Answers

  1. Setting the device explicitly to hw:PCH helps

    Firstly, prevent pulseaudio from restarting ...

    /etc/pulse/client.conf

    ~/.config/pulse/client.conf

    ~/.pulse/client.conf

    Stop pulseaudio

    pulseaudio --kill

    In QjackCtl (graphics mode) setup ...

    Set to alsa

    Set hw:PCH (try all)

    Set it to realtime (try both)

    In the next tab set "execute script after startup" with

    pacmd set-default-sink jack_out

    Save and start the server now

    Start pulseaudio ...

    pulseaudio --start

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