Audio not working on latest kernel version; devices say "Dummy output"

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Hi, running into a strange problem.

I have a Dell XPS 13 9320, which previously was working fine.

However, after the latest kernel update, 6.5.55-200.fc38.x86_64, the audio has stopped working. If I change the volume, the control says “Dummy output” rather than “Speaker”.

Interestingly, if I boot the system using the previous kernel, 6.4.15-200.fc38.x86_64, the audio works as expected.

I have a few newbie-ish questions about where I should go from here:

  1. Is there somewhere I should report this bug?
  2. If so, what details should I include in the report? Are there any commands who’s output may be useful?
  3. I’m aware that by default only 3 version of the kernel are kept. I would like to preserve 6.4.15, is there a way to specify that? Or would you suggest just increasing the number of kernel versions kept?

Apologies if these questions are too basic or I haven’t provided enough information! Please let me know if I can provide anything