I'm still trying to figure out what is going on with the audio crackling. Here's what I've identified that I can do so far to avoid the crackling problem:
1) Use the linux-image-6.1.0-17-amd64 or earlier kernel package along with pipewire 2) Use the linux-image-6.1.0-18-amd64 or later kernel package with pipewire stopped and pointing audio clients at the ALSA devices natively or use jackd2 1.9.21~dfsg-3 or pulseaudio 16.1+dfsg1-2+b1 I still don't understand why the kernel versions matter but I have been able to identify that it is not a problem specifically with the Debian built kernels. I have run experiments where I build a kernel from the official 6.1 releases from kernel.org using the kernel config file from linux-image-6.1.0-17-amd64 and accepting all defaults when running make oldconfig. Doing some bisecting I've found the audio crackling does not happen with 6.1.52, which is what linux-image-6.1.0-12-amd64 is built from, and does happen with 6.1.75, which sits between linux-image-6.1.0-17-amd64 and linux-image-6.1.0-18-amd64. At this moment my machine is running 6.1.112 which I built myself and configured as mentioned earlier. The audio crackling was very bad with pipewire 1.2.4-1~bpo12+1. After 3 days of validation I have had no problems at all using 6.1.112 with pulseaudio 16.1+dfsg1-2+b1.
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