In my case, I just had to add support for KSPROPERTY_AUDIO_CHANNEL_CONFIG to my IMiniportWavePci class and then everything was jake.Moreover if you support this property in your minidriver, you might be handling it incorrectly, making Windows believe that you don't support anything else than KSAUDIO_SPEAKER_STEREO.
Could it be because I do not have the topology part of the miniport? I thought I would not need it as my device has no mixing and volume control on it.
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