After working fine, audio is unavailable: "No output or input devices found"

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Hello everyone,

I'm new to the KDE community and have found it's both large and welcoming! And someone pointed me here as one of the places to ask about this problem. Here's my scenario:

Fedora Server 38, fresh installation, NO GNOME (!!), then an installation of KDE with a few utilities from other distributions. At this point I had rhythmbox working just fine.

The next morning, rhythmbox NOT running, so I don't know WHEN the problem occurred and therefore exactly what changed, but to finish things off, I needed to add some scanner software, didn't know much about the available packates so I installed a number of packages for testing, including two non-scanner-related packages:

   gimp   skanlite   sane   gscan2pdf   simple-scan   kdenlive

I also had mounted some NFS disks from the local net and needed to update the system's authorization files, so I moved in configurations for a number of other users and groups so that the file permissions information is all available on this box (I run a modest server farm). It's possible but unlikely I botched the auth-files somehow.

OH, and if it might matter: I've had SERIOUS problems with "Wayland", I can't even log in successfully with it - the session always crashes - yet KDE's cog-wheel type icon there during login somehow disappeared, thus taking the "Xorg" login option away, and so, not taking the time to do it better, I'm now logging in to "multi-user mode" (textually,) and then running xinit with a pointer to the KDE startup program. This works fine but it does change the ownership of some running processes from root to my user-id. AND, notably, I was running rhythmbox and playing music as I worked after having done this, so I think it's unlikely it's related to this audio problem, but I don't really know that.

Later, when I decided to play something, I discovered that the speaker icon on the lower right has a red slash across it and when mouse-hovered over it says: "No output or input devices found"

Since then I've done a LOT of homework, including swapping out the whole operating system disk for one from one of the server systems, and thus proved the hardware is just fine.

Along the way I found that there was a conflicting version of piperwire, namely:

- package pipewire-pulseaudio-0.3.80-1.fc38.x86_64 from @System conflicts
  with pulseaudio provided by pulseaudio-16.1-4.fc38.x86_64 from fedora

So I fixed that.

Some software packages claim there's no audio hardware, but alsactl says there are either two or three "cards", depending on whether or not I've got a USB based plug-and-play controller plugged in. The other two are HDMI, and "Realtek ACL1220". There are SIX HDMI-capable monitors (all connected via "displayport" connectors - more on that in a moment), and while I've NEVER used them, these ASUS monitors MAY have built in speakers - I don't know. Meanwhile the Realtek is a garden-variety built-in affair that comes with the motherboard.

I've tried "dnf update", installed alsa-tools, alsa-ucm-utils, pulseaudio-utils and pulseaudio itself (which is when I found the conflict noted above), and tried using these as best I can as a Linux audio novice ... and everything else I can think of...

OK, short of a fresh installation and NOT installing things I now know I won't need, ideas?

Now, about the HDMI stuff: The video card's manufacturer claims one can have independent audio streams per display - but again, I don't use them.

Thanks - oh, and if there's a better forum for this, please point me there!

Regards,
Richard



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