Thanks for your report! Could you please provide the following?

- From a boot where the problem occurred, open a terminal and copy and
paste the command below. It will save the complete kernel log as
dmesg.txt in your home folder. After the command finishes, attach that
file to this bug:

    sudo dmesg > ~/dmesg.txt

Would you mind testing one Mainline Ubuntu kernel build as well?

It can be found here https://kernel.ubuntu.com/mainline/v7.1/.
Instruction how to install:
https://wiki.ubuntu.com/Kernel/MainlineBuilds

I'm suspecting
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=bc621e91d6fc004cfae9148c5a91acad19ada3e4
could be fix here, which should be available in Ubuntu Mainline 7.1

** Changed in: linux (Ubuntu)
       Status: New => Incomplete

** Changed in: linux (Ubuntu)
     Assignee: (unassigned) => Krystian Kaniewski (kkaniewski)

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https://bugs.launchpad.net/bugs/2163598

Title:
  AMD Radeon RX 550 HDMI audio distorted at 3456x1944, works correctly
  at 2880x1620

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