为什么会出现alc-layout-id,这是外网指南里面的原话:
Lilu & AppleALC interactions
When Lilu loads it finds the value of "layout-id" and passes it to AppleALC which creates a new Device Property called "alc-layout-id" that inherits this value. AppleALC then sets the value of "layout-id" to a new target ID (usually 7) and patches the target layout in AppleHDA (using Lilu's patching engine) with the connector info, platform and layout files required for your codec indexed by the value of "alc-layout-id".