vc4.ko brings unusable&unstable ALSA sinks

[Ryutaroh Matsumoto]

> As I do not have a multi-channel device, I have no idea on
> multi-channel functioning...

The following is a screenshot of "configuration" tab of
"pavucontrol". It shows "5.1 multichannel" and "stereo" and "off"
in Japanese (I was unable to set the languate to English).
The driver is vc4hdmi. It seems somewhat hopeful...

At least vc4hdmi has intention of supporting multi-channel.

Best regards, Ryutaroh
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