Comment 2 for bug 1858200

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Daniel van Vugt (vanvugt) wrote : Re: pulseaudio produces garbage on HDMI after 19.10

The other thing that changed in this area between 19.04 and 19.10 was the kernel, so we need to rule that out first before pursuing PulseAudio. Please try installing kernel 5.0.0 which is more like what was in Ubuntu 19.04:

  https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.0/

Then run 'uname -a' to confirm the older kernel is active. Does the bug still occur there?