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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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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
  • 153
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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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