If I disable D-Bus Interface and Jack D-Bus Interface in the Misc Preferences I _seem_ to be able to stop and start the server. But it's clearly still not working right! I can't actually change saved config without quitting and re-opening qjackctl. Even then it will something try and start the jack server automatically even though the Preference setting is set to not do so. Ontop of that no matter if I have dbus enabled I *always* get "/usr/bin/jackdbus auto" listed if i ps ax to see what is actually running. Has somebody broken Jackd in Ubuntu? Is it strange that I seem to have both jackd and jackd2 installed and to attempt to remove either wants to remove different selections of packages? Although this can't be the issue as this side of things hasn't changed in the last two weeks and this working as it should do has! Dale. ________________________________ From: Linux-audio-user <linux-audio-user-bounces(a)lists.linuxaudio.org> on behalf of Dale Powell <dj_kaza(a)hotmail.com> Sent: 07 July 2018 11:28 To: linux-audio-user(a)lists.linuxaudio.org Subject: [LAU] Ubuntu 18.04 can't stop Jack from qjackctl Hi all. I've been using Ubuntu Studio since 14.04, always run with Jack as the main audio server and generally never had any issues. Upgraded to Ubuntu Studio 18.04 and everything was fine for some months but within the last week or so I can't get the Jack Server to Stop from within QJackCtl, the application just hangs, making it quite a pain to change between using my internal and external devices! Any idea what may be causing this or steps to fault find the issue? Currently I have set QJackCtl to not connect on startup, so I can killall qjackctl, kill -9 jackdbus(pid), restart qjackctl, select correct config and start the server running. So I can get on with my work but obviously it would be nice if things worked as they should again. Regards, Dale.

On Sat, 7 Jul 2018, Dale Powell wrote: I am running ubuntustudio 18.04 and have not had that issue. the first thing to try is from the command line try: jack_control stop or: jack_control exit Either of which should also stop jackdbus. If these give you an error as well, then jackdbus is the problem. if they work, the problem would be with qjackctl itself. -- Len Ovens www.ovenwerks.net

Thanks for the pointers everybody. Ralph was correct in that I didn't know that jackd was a virtual package to cover both as the libraries are meant to be (on the whole at least) compatible so I admit that always confused me a little in the past. Makes sense now. Thanks for pointing out jack_control, I should have searched that first rather than brute forcing it with the ugly commands I know. Well it seems to stop and start with no issues with jack_control so almost certainly the issue lies with qjackctl. You all say it's working fine for you. As I said it was for me until today, well last time I would have had to use the function before today was roughly two weeks ago, but it has worked with no issues in 18.04 between installation a few days after release (I got a new SSD so didn't wait for the point release like I usually would) up until today. So it's a new issue with a previously working package, not something that has always been like this on 18.04 for me. When did you last do an apt upgrade? Thanks for your help, Dale.

"The problem (feature) with the debian jackd2 install of both jackd and jackdbus, is that if jack is not running and the user starts an application looking for jack, it will start jackd for them by default. then qjackctl will not be able to run jackdbus as normal." I have qjackctl as one of my Startup Applications, starts minimised to Tray but is always running well before I could even consider opening an audio application so this definitely isn't my issues. I've always worked like this. I didn't think you could change devices, or generally get any of the Settings you change to take affect, without Stopping and Starting the Jack Server again. Not actually really tested it though. I have two saved configs, one for my internal audio, one for my external interface. I'd usually - Stop, open Settings, select other Config, OK, Start - and everything would be good. Now it hangs when I hit Stop, or if it doesn't and looks to have stopped I don't believe it really has as I did a test and still got unbroken sound, which I know usually dies if I Stop Jack while something is playing through it. I've tried with the d-bus settings both enabled and disabled with no overall joy but have to admit I've always been confused into exactly what affect these really have on the system.... Dale. ________________________________ From: Linux-audio-user &lt;linux-audio-user-bounces(a)lists.linuxaudio.org&gt; on behalf of Len Ovens &lt;len(a)ovenwerks.net&gt; Sent: 07 July 2018 16:32 To: linux-audio-user Subject: Re: [LAU] Ubuntu 18.04 can't stop Jack from qjackctl On Sat, 7 Jul 2018, Dale Powell wrote: jackdbus, as I understand things, if a wrapper around jackd. It is however, very tightly coupled because it can do things like change the master device or sample rate (don't do that) without stopping jack. It may be that qjackctl is using this ability when you change devices. I have found that I can plugin a USB device and switch master to that device without stopping jack and most connections (except to system*) stay connetced and the clients don't notice anything. However that only seems to work once, trying to switch master twice (back to internal so I can pull the plug) seems to freeze jackdbus. certainly pulling the plug while jack is using a USB device has always been a problem for me though I know of others who have been able change master even after unplugging the device. I do not recall having this problem in the past. Something to look at in the code to see what is different from jackd 1.9.11 and 1.9.12. apt update shows: "All packages are up to date." -- Len Ovens www.ovenwerks.net<http://www.ovenwerks.net> _______________________________________________ Linux-audio-user mailing list Linux-audio-user(a)lists.linuxaudio.org https://lists.linuxaudio.org/listinfo/linux-audio-user

Moved the config file to generate a new one and for now it seems to be working, correctly stopping and saved a new config for both internal and external. Strange as this hasn't been touched by me for at least a month, if not more like two, and was definitely working just two weeks ago when I had a gig. Oh well, thanks for all your help and I really should have tried that as the first step! ________________________________ From: Linux-audio-user &lt;linux-audio-user-bounces(a)lists.linuxaudio.org&gt; on behalf of Dale Powell &lt;dj_kaza(a)hotmail.com&gt; Sent: 07 July 2018 17:10 To: linux-audio-user Subject: Re: [LAU] Ubuntu 18.04 can't stop Jack from qjackctl Installed and tested with Cadence and it works perfectly as expected. Issue only exists with qjackctl. Maybe I should just make the switch.... Except how do I switch audio device in Cadence? Device/Interface is greyed out even with Jack stopped. Plus it doesn't seem to let me save the configs for quick loading and latency etc is also different as they can handle different settings without xruns. Surely Cadence is able to do this too?? Dale. ________________________________ From: Linux-audio-user &lt;linux-audio-user-bounces(a)lists.linuxaudio.org&gt; on behalf of Dale Powell &lt;dj_kaza(a)hotmail.com&gt; Sent: 07 July 2018 16:39 To: Len Ovens; linux-audio-user Subject: Re: [LAU] Ubuntu 18.04 can't stop Jack from qjackctl "The problem (feature) with the debian jackd2 install of both jackd and jackdbus, is that if jack is not running and the user starts an application looking for jack, it will start jackd for them by default. then qjackctl will not be able to run jackdbus as normal." I have qjackctl as one of my Startup Applications, starts minimised to Tray but is always running well before I could even consider opening an audio application so this definitely isn't my issues. I've always worked like this. I didn't think you could change devices, or generally get any of the Settings you change to take affect, without Stopping and Starting the Jack Server again. Not actually really tested it though. I have two saved configs, one for my internal audio, one for my external interface. I'd usually - Stop, open Settings, select other Config, OK, Start - and everything would be good. Now it hangs when I hit Stop, or if it doesn't and looks to have stopped I don't believe it really has as I did a test and still got unbroken sound, which I know usually dies if I Stop Jack while something is playing through it. I've tried with the d-bus settings both enabled and disabled with no overall joy but have to admit I've always been confused into exactly what affect these really have on the system.... Dale. ________________________________ From: Linux-audio-user &lt;linux-audio-user-bounces(a)lists.linuxaudio.org&gt; on behalf of Len Ovens &lt;len(a)ovenwerks.net&gt; Sent: 07 July 2018 16:32 To: linux-audio-user Subject: Re: [LAU] Ubuntu 18.04 can't stop Jack from qjackctl On Sat, 7 Jul 2018, Dale Powell wrote: jackdbus, as I understand things, if a wrapper around jackd. It is however, very tightly coupled because it can do things like change the master device or sample rate (don't do that) without stopping jack. It may be that qjackctl is using this ability when you change devices. I have found that I can plugin a USB device and switch master to that device without stopping jack and most connections (except to system*) stay connetced and the clients don't notice anything. However that only seems to work once, trying to switch master twice (back to internal so I can pull the plug) seems to freeze jackdbus. certainly pulling the plug while jack is using a USB device has always been a problem for me though I know of others who have been able change master even after unplugging the device. I do not recall having this problem in the past. Something to look at in the code to see what is different from jackd 1.9.11 and 1.9.12. apt update shows: "All packages are up to date." -- Len Ovens www.ovenwerks.net<http://www.ovenwerks.net> _______________________________________________ Linux-audio-user mailing list Linux-audio-user(a)lists.linuxaudio.org https://lists.linuxaudio.org/listinfo/linux-audio-user