[alsa-devel] UCM/DAPM - saving power when idle?

I don't deal much with ASoC, so sorry if I'm missing something obvious here...

When a certain use case is activated, that would then activate some DAPM widgets, causing the codec to consume more power. So, we should essentially avoid this unless we're actually playing back/recording. But, why isn't there a "disable all use cases" command, or possibly an "idle" command? (That, essentially, e g pulseaudio should set whenever playback/recording stops)

Or; the option would be that the codec is actually powered down, but only activates itself when there is a stream; but this looks like it could cause problem with loopback paths (e g listening to FM radio, where there are no streams passing through CPU/main memory).