[plasmashell] [Bug 522436] Audio unmuting at random

https://bugs.kde.org/show_bug.cgi?id=522436

Steve Cossette <[email protected]> changed:

           What    |Removed                     |Added
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                 CC|                            |[email protected]

--- Comment #13 from Steve Cossette <[email protected]> ---
Okay so I'm on Fedora 44 and with Nate Graham's help, I believe we pinpointed
the cause.

This is what I do to reproduce this issue:

(NOTE: My network has several Apple and Chromecast devices on the network, I do
not think this would occur without them)
1- Mute sound globally
2- Disable wifi
3- Enable wifi, sound automatically gets unmuted

I did those steps while having pw-mon enabled, I can attach the log if you want
but it is 24000 lines. I fed it through a LLM, it gives the following
breakdown:

The timeline

Your log has 164 top-level events. Here's the relevant spine:

Line    What
2069, 2739      Start state: alsa_output.pci-0000_c4_00.6.HiFi__Speaker__ (node
69) has mute=true, softMute=true, channelVolumes=0.216007. Card 58's hw route
also mute=true. Both RAOP sinks (Steve-2.local id 45, Gazebo.local id 121)
mute=true. Everything muted — correct.
7492–7518       Wifi off. Both libpipewire-module-raop-sink instances (42, 104)
get torn down along with their nodes, ports and clients. Avahi lost the
services.
7520–8189       Wifi on. libpipewire-module-raop-discover recreates two sink
modules (93, 78) → brand-new nodes 120 (Gazebo) and 55 (Steve-2), both born
mute=false. Fresh objects, default state.
8740, 9291      WirePlumber restores mute=true on both new RAOP nodes. Node 69
still muted. So far, fine.
12135   Node 40 appears: Stream/Output/Audio, application.name = libcanberra,
application.process.binary = plasmashell, event.id = audio-volume-change,
event.description = "Volume Control Feedback Sound", media.role = alert,
target.object = 69
12683   Node 69: mute true→false, softMute true→false. channelVolumes unchanged
at 0.216007.
13611   Card 58's hw route follows: mute=false
13936, 14507    Both RAOP sinks unmuted too

IT then recommended to try the following to try to rule plasmashell out:

kquitapp6 plasmashell            # or: systemctl --user stop plasma-plasmashell
wpctl set-mute @DEFAULT_AUDIO_SINK@ 1
nmcli radio wifi off && sleep 5 && nmcli radio wifi on
wpctl get-volume @DEFAULT_AUDIO_SINK@   # still [MUTED]?
plasmashell &

I did so, and the mute state does remain after reenabling wifi. It does look
like it is something in plasmashell (maybe plasma-pa?)

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