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  • !304

Merged
Opened Jun 06, 2020 by Tanu Kaskinen@tanukOwner

alsa-mixer: Pick at most one fallback mapping

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The old behaviour was such that if none of the normal mappings worked, we would probe ALL fallbacks. I don't think that makes sense, and it caused concrete issues: let's say we have a regular stereo mic device, but there's no "front" PCM defined for it. In this situation we would probe the stereo-fallback mapping (which uses "hw" instead of "front"), and it would work, but then we'd also probe the "multichannel-input" mapping, which would also work, so we end up with two mappings that don't have any difference in behaviour.

I think it's better to simply pick the first working fallback and ignore the rest.

Fixes: https://gitlab.freedesktop.org/pulseaudio/pulseaudio/-/issues/901 (issue is marked as confidential due to unreleased hardware)

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Reference: pulseaudio/pulseaudio!304
Source branch: pick-just-one-fallback