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With two USB sound cards (presonus audiobox and behringer xenyx q802) I have crackling sound after the kernel was updated to 5.13.0-37. Tried on three different machines with Ubuntu 20.04 and 21.10. Audio output from onboard audio is ok. Output from USB sound card has irregular peaks (faster than every second).

I found this:

Upgrading to 5.13.0-37-generic breaks audio with external audio card

which is very interesting, but doesn't tell what to do to get it working again. I have no older kernels I could revert to. Any suggestions?

I mean, these were updates also for a LTS version that are not supposed to break a working system?

minyves
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  • This sounds like a bug. If you can, file a bug report. Developers rely on bug reports to find, research, and fix bugs. – Nmath Mar 25 '22 at 09:24
  • Pretty sure it's a bug, as stated in the above mentioned post: UPDATE: bug is reported by multiple users and Confirmed https://bugs.launchpad.net/ubuntu/+source/linux-signed-hwe-5.13/+bug/1966066

    Because it seems like a fundamental problem I asked for detailed procedures to get it working again.

     – minyves Mar 25 '22 at 09:37
  • That's an even better reason to file a bug report. This will give developers more information to fix it. The more people a bug affects, the faster it will get fixed. In the meantime, when you boot Ubuntu, you can select the previous kernel version since it is unaffected. – Nmath Mar 25 '22 at 10:17
  • Good point, will look into reporting the bug. But for your suggestion, as I wrote: > I have no older kernels I could revert to.

    So how do I set up a system with working audio? Tried to install 20.04.3 from here: http://old-releases.ubuntu.com/releases/focal/ , because it should come with kernel 5.11 (https://ubuntu.com/about/release-cycle#ubuntu-kernel-release-cycle)

     – minyves Mar 25 '22 at 11:19
  • But I ended up with the problematic kernel again (5.13, although automatic updates had been deactivated). Seems I miss a point or two... – minyves Mar 25 '22 at 11:26

2 Answers2

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In /etc/pulse/daemon.conf you should have a line like this

 ; default-sample-rate = 44100

edit the file with sudo nano /etc/pulse/daemon.conf (don't forget to remove the ; as it comments the line) to

default-sample-rate = 48000

save the file using Ctrl+X then Yes and press Enter

afterwards run

systemctl --user restart pulseaudio.service

Audio should work now.

You can find older kernel versions from the grub menu under Advanced options for Ubuntu

enter image description here

vanias
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  • Hello. what does this last bit have to do with the answer? You can find older kernel versions from the grub menu under Advanced options for Ubuntu – David Mar 30 '22 at 06:31
  • That doesn't work in many cases, although the default setting of 48kHz was marked as the correct answer here: https://askubuntu.com/questions/1398614/upgrading-to-5-13-0-37-generic-breaks-audio-with-external-audio-card – minyves Mar 30 '22 at 11:41
  • For the last bit of this answer: Actually the only thing that works is rolling back to linux-image-5.13.0-35. But I posted the question: what to do if I have no older kernel? I.e. want a fresh, non-LTS installation? – minyves Mar 30 '22 at 11:45
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If you don't have any older kernel, just install one using

sudo apt install linux-image-5.13.0-35-generic

(the 5.13.0-35 works for me). It seems that next upgrade 5.13.0-41 is a fix.

Pierre-Antoine
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  • Don't forget to install linux headers too: sudo apt install linux-headers-5.13.0-35-generic – tuping May 02 '22 at 12:47