https://bugs.kde.org/show_bug.cgi?id=501964

Harald Sitter <sit...@kde.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEEDSINFO                   |RESOLVED
         Resolution|WAITINGFORINFO              |UPSTREAM

--- Comment #5 from Harald Sitter <sit...@kde.org> ---
I think you need to report this to pipewire (or wireplumber, not actually sure
where this needs fixing). Something is weird about this device. I am guessing
it'd be visible if you toggled the 'show inactive devices' in the toolbar.

What appears to happen is that if you enable 5.1 another, separate, software
device gets created that correctly has the 6 channels. The problem is that this
device has no available "ports" and therefore gets hidden.

> Sink #63
>       Channel Map: 
> front-left,front-right,front-center,lfe,rear-left,rear-right
>       Ports:
>               [Out] Speaker: Speakers (type: Speaker, priority: 200, 
> availability group: Speaker - Output, not available)
>       Active Port: [Out] Speaker

Meanwhile the device you are looking at in your screenshot only has stereo
channels and at least has unknown availability, which is why it is being
displayed.

> Sink #61
>       Channel Map: front-left,front-right
>       Ports:
>               [Out] SPDIF: S/PDIF Output (type: SPDIF, priority: 100, 
> availability unknown)
>       Active Port: [Out] SPDIF

The UI technically does present the situation correctly. Your S/PDIF output
only reports 2 channels and the actual 5.1 output is marked not available, so
it gets hidden by default.

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