pavucontrol and 5.1 audio.

[Steve Underwood]

Hi,

I've just started using 5.1 audio on a Fedora 33 machine for the first 
time, and I have an issue with pavucontrol. I have pipewire installed on 
this machine. If I select the "Output Devices" tab, and unlock the 
volume control for the 5.1 audio device, I see 6 controls, with these 
labels:

Front Left, Front Right, Rear Left, Rear Right, Front Center and 
Subwoofer

These labels seem appropriate, and as I adjust the controls the volume 
of the appropriate channel changes. However, if I go to the "Playback" 
tab, and unlock the volume control for the application (I'm trying this 
with VLC), I see 6 controls with the these labels:

Front Left, Front Right, Side Left, Side Right, Front Center and 
Subwoofer

Those "side" labels seem like something for a 7.1 device, not a 5.1 
device. As I adjust the controls they are mixed up, as follows:

Front Left controls the front left channel (i.e. OK)

Front right controls the front right channel(i.e. OK)

Side Left controls the front centre channel

Side Right controls the subwoofer channel

Front Center controls the rear left channel

Subwoofer controls rear right channel

I'm not sure if this is a bug, or if there might be some configuration 
problem on my machine. Has anyone else experienced something like this?

Regards,

Steve