I just upgraded to 18.04, and I noticed that the sound from my headphones, whether plugged into front or back port, was very crackling and slow/delayed. This issue didn't exist on 17.04/10. It also doesn't affect audio coming from HDMI via Radeon 560 GPU, just the headphone/onboard audio. The relevant device is:

00:1f.3 Audio device: Intel Corporation Sunrise Point-H HD Audio (rev 31)  

I tried a bunch of fixes for pulseaudio I found googling, including this one and this one. Neither of which helped.

I have found something that at least makes it listenable - changing "default-fragment-size-msec" from 25 to 5 in /etc/pulse/daemon.conf. It makes it much much better, but still a little crackly from time to time.

I've googled for 30 min or more now, and not finding anything else that seems recent and relevant, so wondering if I should maybe open a bug, or if there's something I'm overlooking here.


I had the same issue and killing pulseaudio fixed it for me. I'm not sure why it would get into a bad state, but restarting pulseaudio might be something to try.


killall pulseaudio

Press Ctrl+Alt+T to go to a terminal and use your favourite editor to edit the file

nano /etc/pulse/default.pa

then find a line containing:

load-module module-udev-detect

modify this to become:

load-module module-udev-detect tsched=0

save and exit and you're all set!

  • you need to restart your laptop or run: pulseaudio -k after you change the configuration. – stason Nov 16 '18 at 3:05
  • all it does is makes the sound completely distorted – Sarge Borsch Nov 16 '18 at 13:12
  • This is the solution and it should be the accepted answer -- although it would be good to edit it and add the pulseaudio -k command – Merc Feb 15 at 8:59

I ran into the same issue (crackling sound) today on Ubuntu 18.10 on my Intel NUC Canyon Hades.

killall pulseaudio

only fixed it temporarily for some reason. After a few minutes the problem was back again.

What ultimately did the trick was the answer posted by Fabby in combination with the comment by statson to enter

pulseaudio -k

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