[lug] Forcing a Sound Device

stimits at comcast.net stimits at comcast.net
Sat Nov 11 15:51:07 MST 2017

I've tried a number of things to get a change in the default audio on my Fedora/KDE system. For whatever reason, no matter what I do, every playback device wants to start with the built in analog audio of the motherboard. I can change this to use the HDMI or USB audio...as soon as a song or video ends, it reverts. If I watch a video and go to full screen...it reverts. I don't have the analog audio on the motherboard connected.
Various mixers have allowed me to change default audio device. Until the song or video ends...then it reverts to being default.
One of the things I tried was to blacklist the motherboard's kernel module for the device...but apparently other things depend on this despite no other module depending on this. I can remove the module, and no other module reports needing it, but no mixer or audio application works after that. The USB headset has its own digital audio, and the video card for HDMI has its audio...I do not believe the integrated audio should have any effect unless other programs mistakenly demand to open integrated audio.
I've also tried settings in pulse audio's default.pa, but these seem to fail as well.
Does anyone have any idea how I can summarily ban the motherboard's integrated audio? I'm about to try disabling it in the BIOS, but this is a multi-boot system and I suspect this will cause other issues which I won't be able to set right again once it happens (short of a full system restore). I'd love to find a file I can remove write permission to and set SElinux permissions to deny write to anyone or anything...ever...but I don't know where this default setting is coming from if the mixer GUI's set a value and then it reverts. I cannot find the file. I suspect it is in udev.
There are too many mechanisms for audio...pulse, alsa, KDE, gnome, systemd, udev. I really wish there were just one mechanism and it worked.
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