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What the purpose of MuteGPIO?

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Does anyone know what the purpose and format of MuteGPIO in PathMapRef?


I am trying to get LegacyAppleHDA working with ALC883. It kind of works except, from time to time it KP during the boot because of AppleHDA. When I changed the MuteGPIO setting for headphone (nothing else), the whole audio device disappear from system profiler. It seems that MuteGPIO has significant impact on AppleHDA. Would someone enlighten me how MuteGPIO get used by AppleHDA?



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