Created attachment 290145 [details] /etc/pulse/default.pa Hello, since Kernel 5.6 (also 5.7.6) the audio output (connected via HDMI) is crackling / distorted. This happens as follows: the sound is crystal clear for a few seconds. Then it starts to scratch quietly and gets worse until it is totally distorted. This behavior is repeated about every three minutes. I have the impression that deep tones speed up the behavior. Especially speech, I think. The sound can also be distorted at the beginning. I only picked a starting point. A similar behavior was seen with kernel 5.4, in System Preferences -> Audio "speech-dispatcher" appeared from time to time, then the sound was distorted. After I uninstalled it the sound was perfect. I use a Navi14: https://www.sapphiretech.com/en/consumer/pulse-radeon-rx-5500-xt-8g-gddr6 Because of the Navi GPU I need these patches: https://lists.freedesktop.org/archives/amd-gfx/2019-December/043682.html Since kernel 5.6.13 the patches are included. Here are the alsa-info.sh output: Kernel 5.4: http://alsa-project.org/db/?f=a51d43c18273c3c79d4341e251a32542e2ee3714 Kernel 5.6: https://alsa-project.org/db/?f=97cd639a2a416f2a5875b7534dd39ce38c36bd93 Kernel 5.7: https://alsa-project.org/db/?f=31d9a277aa2e0bca24e6089ba5c1e302ec2c89a1 Attached: /etc/pulse/default.pa IIRC, I only changed two lines: 1. ### Automatically load driver modules depending on the hardware available .ifexists module-udev-detect.so load-module module-udev-detect ignore_dB=1 tsched=0 2. ### Automatically suspend sinks/sources that become idle for too long #load-module module-suspend-on-idle I"m new to Linux so til now I don't know how to bisecting a bug, sadly. That's why I described the problem as good as possible. TIA Karl
The regression still presists with Kernel 5.8.4. Alsa-info.sh output: Kernel 5.8: http://alsa-project.org/db/?f=ab703453f4f025d5056aad29d2608b02840c4a05