[lug] Forcing a Sound Device

Alan Robertson alanr at unix.sh
Sun Nov 12 08:12:20 MST 2017

I use KDE on Ubuntu (Kubuntu) and always use a non-default audio device.
Here's how I make that happen on Kubuntu:
right click the speaker icon, and bring up Audio Volume Settings.

Click on the configuration tab (far right tab).

For all your unwanted audio devices, click on Profile and select "off".
Click OK.

It works for Kubuntu - don't know about Fedora.

  Alan Robertson
  alanr at unix.sh

On Sat, Nov 11, 2017, at 03:51 PM, stimits at comcast.net wrote:
> 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.>  
> Thanks!
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