41

I have a problem when I try to connect my guitar to my computer, via line input. Audacity works well, and I can record what I play on my guitar (selecting from Preferences from where to record to default:line0). But the problem is in Qjackctl : at first when I click on start it shows this error:

error 1

after that when I click on Cancel it gives this error:

error 2

This is the log from the messages window:

10:30:37.368 Patchbay deactivated.
10:30:37.416 Statistics reset.
10:30:37.459 ALSA connection change.
10:30:37.497 D-BUS: Service is available (org.jackaudio.service aka jackdbus).
Cannot connect to server socket err = No such file or directory
Cannot connect to server request channel
jack server is not running or cannot be started
10:30:37.512 ALSA connection graph change.
10:30:44.060 D-BUS: JACK server could not be started. Sorry
Cannot connect to server socket err = No such file or directory
Cannot connect to server request channel
jack server is not running or cannot be started
Sat Dec  1 10:30:43 2012: Starting jack server...
Sat Dec  1 10:30:43 2012: JACK server starting in realtime mode with priority 10
Sat Dec  1 10:30:44 2012: control device hw:0
Sat Dec  1 10:30:44 2012: control device hw:0
Sat Dec  1 10:30:44 2012: [1m[31mERROR: Failed to acquire device name : Audio0 error : Method "RequestRelease" with signature "i" on interface "org.freedesktop.ReserveDevice1" doesn't exist
[0m
Sat Dec  1 10:30:44 2012: [1m[31mERROR: Audio device hw:0 cannot be acquired...[0m
Sat Dec  1 10:30:44 2012: [1m[31mERROR: Cannot initialize driver[0m
Sat Dec  1 10:30:44 2012: [1m[31mERROR: JackServer::Open failed with -1[0m
Sat Dec  1 10:30:44 2012: [1m[31mERROR: Failed to open server[0m
Sat Dec  1 10:30:45 2012: Saving settings to "/home/gevorg/.config/jack/conf.xml" ...
10:31:11.438 Could not connect to JACK server as client. - Overall operation failed. - Unable to connect to server. Please check the messages window for more info.
Cannot connect to server socket err = No such file or directory
Cannot connect to server request channel
jack server is not running or cannot be started

Now I can't understand what my problem is.

Community
  • 1
hingev
  • 6,684

8 Answers8

58

None of these solved my problem. This did: http://dpod.kakelbont.ca/2015/08/16/fixing-qjackctl

  1. In a terminal start qjackctl:

    qjackctl

  2. Before you try to start it, click the Setup button in the GUI (right-hand side, middle).

    enter image description here

  3. On the setup GUI change Input Device and Output Device (middle, right-hand side) from (default) to hw:PCH (In the screenshot one has been changed and the other has not).

    enter image description here

  4. Restart qJackCtl. You should now be able to successfully use the Start button.

karel
  • 122,292
  • 133
  • 301
  • 332
pwr
  • 581
  • 4
  • 2
31

Try this from the command line: 

pulseaudio --kill  
jack_control  start

Then when your done do this: 

jack_control exit  
pulseaudio --start

And sometimes jack wont die, so then do

Get jackd's PID: 

ps -aux | grep jackd  
kill -9 jacksPID
Seth
  • 59,332
null_radix
  • 924
10

I made it and solved:

sudo killall -9 jackdbus
BuZZ-dEE
  • 14,533
Gleriston Sampaio
  • 101
6

I solved the error d-bus jack server could not be started by deleting 

~/.config/rncbc.org/QjackCtl.conf

and restarting qjackctl. In my case, I had messed up the settings, and it was stored in this file.

Zanna
  • 72,312
bepositivefresh
  • 61
3

There are a lot of relevant explanations here:

http://jackaudio.org/faq/pulseaudio_and_jack.html

I have solved my problem after prefixing the server path with pasuspend -- and choosing the appropriate Interface (upper right corner) to the right sound device in my system, by clicking the > symbol and choosing from the list.

heltonbiker
  • 131
2

I used sudo killall -9 jackdbus

Then sudo qjackctl

That worked! But i don't get any sound and can't get my ffado mixer to run after that.

waltinator
  • 37,856
Jehy
  • 21
1

Running QJackCtl from commandline as root user fixed the issue for me.

sudo qjackctl
livinston
  • 139
0

Step 1. View audio cards

cat /proc/asound/cards

(view audio cards)

Step 2: 

pulseaudio --kill

Step 3: 

qjackctl

In GUI find Interface:[default] and choose relevant audio card

Press play |>

Step 4:

Run process requiring jackd (in my case, sonic-pi) then, when you're all done...

Step 5:

pulseaudio --start

This is sort of a mashup of the previous answers, but it worked for me while none of the single answers did. It helped me to read a little about the differences between pulseaudio and jackd.

I hope this helps!

Zanna
  • 72,312
plvankam
  • 1