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I sorted both directions into nine symptom clusters each, every entry tagged Auto, Privileged, Reboot-tail, or Guide under the privilege model. The clusters mirror the doctor's probe ladder, so the boundary between what it fixes and what it can only guide falls along the tiers it already probes.
Two findings are worth keeping. The buildable core reduces to five primitives on both sides (set-default, set-card-profile, unmute, restart-services, config-drop-in), so the breadth is in the diagnosis, not the remedies. And the clusters imply three new read-only probes: dmesg-pattern hints, an unmute-doesn't-stick signature, and a re-probe-after-idle.
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This catalogues real, user-reported ways the microphone and speakers fail on Linux, to feed the audio doctor's triage. It holds 58 input and 59 output distinct root causes, across eight layers each: kernel/driver/firmware, ALSA, PipeWire, Bluetooth, HDMI, USB, app/portal, hardware. Every entry carries its symptom, cause, concrete fix, a sudo/reboot tag, and a source.
The sudo/reboot tag is the triage lever. A no-sudo, no-reboot fix is a candidate for a doctor remedy. A firmware, BIOS, or physical fix can only ever be a printed instruction. Triage into build, guide, or out is the next pass.
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