[ubuntu-studio-users] Audio pop/glitch/crackle issues

[mario buoninfante]

Hi,

Here's a bit more info and some updates.
I'm running Xubuntu 22.04.1 with Ubuntu Studio (everything installed).
I'm using a Focusrite Clarett 8pre USB as audio device running at 96kHz 
sample rate, 256 sample buffer size and 3 JACK period.
I'm fully up-to-date and the kernel is Linux 5.15.0-56-lowlatency x86_64 
(I think the kernel got updated in the last round of updates).

In the last 2 days I unsuccessfully tried to do the following (in 
non-particular order):

  *

    uninstall pipewire - too many dependencies, so I gave up on that

  *

    the combo

      o

        systemctl --user stop pipewire.socket && systemctl --user stop
        pipewire.service

      o

        systemctl --user mask pipewire.service

  *

    re-install pulse audio

  * in /etc/pulse/default.pa I added "tsched=0" to the line containing
    "load-module module-udev-detect"
  *

    edit the files in /etc/pipewire/media-session.d adding:

      o

        session.suspend-timeout-seconds = 0

  *

    install pipewire-pulse

  *

    replace pipewire-session-manager with wireplumber

  *

    re-install pipewire-session-manager and remove wireplumber (this is
    actually the last thing I tried, so now I don't have wireplumber
    anymore)


Nothing helped.
Then, after using:

  *

    systemctl --user status pipewire pipewire-session-manager

I realised I was getting 2 errors:

  *

    mod.rt: could not set nice-level to -11: Permission denied

  *

    spa.v4l2: '/dev/video0' VIDIOC_QUERYCTRL: Input/output error

I fixed the former adding

    |@audio - nice -20|

to /etc/security/limits.d/audio.conf

I didn't manage to address the latter though.


The situation seems to have improved, not so much with streamed 
audio/video, but with audio only (eg audacious) - it might be too early 
to assess this though, since it was a late night move.

I went from "totally unusable - glitches, pops and crackles 80% of the 
played audio", to "getting pops and crackles sporadically".
Still makes my system unusable, since I mainly record/mix/produce music 
on my computer, but all improvements are welcome!

With audio/video from the internet though (mainly YouTube via Firefox), 
I'm still getting terrible performance out of this.


Cheers,
Mario







On 02/12/2022 21:09, mario buoninfante wrote:
> Hi,
>
> Recently I started having issues with the audio performance of my 
> system (Ubuntu 22.04.1 LTS).
> It seemed to have started after my last update.
> Simply running "top" I noticed I have "pipewire" running and I was 
> wondering if that could be the problem.
> I don't know if that has always been installed as I never checked 
> before today, but I found online that several people are having 
> similar issues both on Ubuntu and Fedora.
>
> Any feedback/recommendation is welcome :)
>
> Cheers,
> Mario
>
>
>
-- 
---
musician, QA engineer, mental health first aider MHFA England

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