pulseaudio bridge cause mass Xruns, even there is no output/input

[Masakazu Chou]

I want to report the situation, because I use my laptop to teach music to my students with midi keyboard.

In the past I use QjackCtl or Cadence (pulseaudio bridge off) on my laptop, I can run jackd2 on 128X3 buffers with forced 16 bit to use Qsynth and Hydrogen well without Xruns ,but I get lot of xrun on Ubuntustudio 20.04 (the same laptop, and using recommended system tweaks., The sound becomes distorted. The version of ubuntustudio-controls is 1.12.3 . On "Pulse Bridging"tab , Even I turned off all input bridge and output bridge ,and it still happen. I found pulseaudio is still working (I can hear sound from normal apps like Firefox... ).

I see an option "turn on a2jmidid", but no "turn on Pulseaudio Bridge" option. In pro audio job ,we usually only use full jack audio system. (Using pulseaudio during break time). I wish there is an option "turn on Pulseaudio Bridge" ,so I can turn off it.

[Erich Eickmeyer (eeickmeyer)]

In the future, please use "ubuntu-bug ubuntustudio-controls" for this type of thing to include information from your system. As it stands, please type "apport-collect 1867539" into a terminal window to complete this bug report.

[Len Ovens (len-ovenwerks)]

@Shoichi Chou (mgdesigner) It works here. So... in the audio setup tab and the pulse bridging sub tab, you can remove input and output bridges until there are none left then hit "Apply Audio Settings" so it can take effect. If I monitor the jack graph using either Carla or Patchage, I see the bridge(s) vanish when I hit the Apply button. I can add them back in the same way. For any changes in the audio section to take effect, the Apply button needs to be used.

[Erich Eickmeyer (eeickmeyer)]

To add to Len's comment above, this could also be the result of Cadence being previously installed and ran on your system, which messes with the user pulseaudio configuration in a way that's incompatible with Ubuntu Studio Controls. As this doesn't seem to be a bug, but user error/support request, I'm closing this bug as invalid.

[Masakazu Chou (mgdesigner)]

Excuse me, I installed Ubuntu studio 20.04 clean and updated to latest version to test it. I have other laptops with the same series model installing ddefferent distros (including KXstudio, Debian..).

 I am sure I have remove all input and output bridges .I recorded a video it just happens.

https://www.youtube.com/watch?v=IrXr7P6i_s0

[Masakazu Chou (mgdesigner)]

test video: https://www.youtube.com/watch?v=IrXr7P6i_s0

My audio chip is ALC293.

[Erich Eickmeyer (eeickmeyer)]

We believe you are indeed having the problem. I just tested on a clean install myself and using the same settings you did, I was unable to reproduce the issue. Therefore, there might be some incompatible hardware on your end. Remember, not all hardware is 100% compatible with Linux.

Since the problem cannot be reproduced by myself or by Len (and we have completely different hardware) it is therefore *not* a bug and therefore this is a support request that should be on askubuntu.com, not a bug tracker. Hence, it's closed as "Invalid" which, in Launchpad, is defined as "Not a bug. May be a support request or spam." This is clearly not spam, therefore it's a support request.

Please present your issue on askubuntu.com tagging "ubuntu-studio", "jack" and "alsa". Perhaps someone there will have an idea what is going on. Either way, this discussion does not belong on a bug tracker.

[Masakazu Chou (mgdesigner)]

Ok. Thanks for your help.