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Thread: Sound card confusion

  1. #1
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    Default Sound card confusion

    Desktop XFCE. Pulse Audio in use.

    Objective - Have two separate sound outputs so that they can have different volumes set simultaneously. One to an amplifier, the other to headphones.
    My on-board sound is SBx00 Azalea (Intel HDA) and is set as default and feeds into an audio amplifier via a 3.5mm micro audio plug. My nVidia GT218 video card provides an HDMI output which I cannot use having no HDMI devices. So I installed an Audigy Sound Blaster card to provide an output to headphones. But it disables the Azalea so I have no sound while offering me (via YaST) the nVidia HDMI and the Sound Balster. The Azalea does not show up in YaST or pavucontrol.

    Is there a workaround? Any suggestion would be appreciated.

  2. #2

    Default Re: Sound card confusion

    Quote Originally Posted by ionmich View Post
    Desktop XFCE. Pulse Audio in use.

    Objective - Have two separate sound outputs so that they can have different volumes set simultaneously. One to an amplifier, the other to headphones.
    My on-board sound is SBx00 Azalea (Intel HDA) and is set as default and feeds into an audio amplifier via a 3.5mm micro audio plug. My nVidia GT218 video card provides an HDMI output which I cannot use having no HDMI devices. So I installed an Audigy Sound Blaster card to provide an output to headphones. But it disables the Azalea so I have no sound while offering me (via YaST) the nVidia HDMI and the Sound Balster. The Azalea does not show up in YaST or pavucontrol.

    Is there a workaround? Any suggestion would be appreciated.
    You need to install
    Code:
    paprefs
    Run the command paprefs in the terminal and enable
    simultaneous output.
    Code:
    check the box in add virtual output on all local sound cards
    Then open pavucontrol and look for simultaneous sound and select it.
    People who do not break things first will never learn to create anything

  3. #3
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    Default Re: Sound card confusion

    Quote Originally Posted by conram View Post
    You need to install
    Code:
    paprefs
    Run the command paprefs in the terminal and enable
    simultaneous output.
    Code:
    check the box in add virtual output on all local sound cards
    Then open pavucontrol and look for simultaneous sound and select it.
    Thanks for the speedy response.

    I followed your instructions. When I selected "Simultaneous Output" in the paprefs menu it showed that "Add virtual output device for simultaneous output on all local sound cards" had already been selected. That's because I had already added virtual outputs via YaST yesterday. However when I started pavucontrol the Azalea card was still not shown. It still does show in YaST as being the default device but the Other>Master Volume screen shows no volume control and the Other>Play Test Sound does not produce sound.

    Then while in YaST I enabled the Sound Blaster as device 1 thinking this might unlock the Azalea. It's Other>Master Volume screen shows all kinds of controls but not a Master Volume control. And when tested it also produced no sound.

  4. #4
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    Default Re: Sound card confusion

    Perhaps this might provide a hint. When I try to play an online music stream using mpg123 it errors out...

    Code:
    Playing MPEG stream 1 of 1: mp3 ...ICY-NAME: Radio Swiss Classic
    ICY-URL: http://www.radioswissclassic.ch
    
    
    MPEG 1.0 L III cbr128 44100 j-s
    
    
    ICY-META: StreamTitle='Joseph Wölfl - Konzert für Klavier und Orchester Nr. 6 D-Dur op. 49 "Der Kuckuck"';
    [src/libout123/modules/alsa.c:241] error: Fatal problem with alsa output, error -32.
    [src/libout123/libout123.c:654] error: Error in writing audio (Success?)!
    [src/libout123/buffer.c:415] error: writing to buffer memory failed (11)
    main: [src/mpg123.c:809] error: Deep trouble! Cannot flush to my output anymore!

  5. #5
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    Default Re: Sound card confusion

    Success. I left the Sound Blaster plugged in. I added another (generic) sound card and deleted the on-board Azalea from inside YaST. Now I finally have two separate sound outputs. I am still curious as to why the Azalea creates a problem and will report further if I find a solution.

  6. #6
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    Default Re: Sound card confusion

    Sound Blasters have always been a problem. Note are you in the audio group?

  7. #7
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    Default Re: Sound card confusion

    Quote Originally Posted by gogalthorp View Post
    Sound Blasters have always been a problem. Note are you in the audio group?
    I don't know what the "audio group" is. Please enlighten me.

  8. #8
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    Default Re: Sound card confusion

    Is you user in the audio group can go to Yast - users to confirm/change

  9. #9
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    Default Re: Sound card confusion

    Quote Originally Posted by gogalthorp View Post
    Is you user in the audio group can go to Yast - users to confirm/change
    Thanks. Click! The penny finally dropped. Sometimes my age gets in the way. No, my user was not in the audio group but is now. I have always found groups mysterious and never understood why they exist. I need to do some reading.

    Thanks again.

  10. #10
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    Default Re: Sound card confusion

    Quote Originally Posted by ionmich View Post
    Thanks. Click! The penny finally dropped. Sometimes my age gets in the way. No, my user was not in the audio group but is now. I have always found groups mysterious and never understood why they exist. I need to do some reading.

    Thanks again.
    For the most part ACLs are used, but it does seem that some situations still require explicit audio group membership. I'm not sure what the underlying reason is.

    For example...
    Code:
    dean@linux-kgxs:~> getfacl /dev/snd/controlC0
    getfacl: Removing leading '/' from absolute path names
    # file: dev/snd/controlC0
    # owner: root
    # group: audio
    user::rw-
    user:dean:rw-
    group::rw-
    mask::rw-
    other::---
    
    dean@linux-kgxs:~> groups
    users sys tty lp vboxsf vboxguest
    dean@linux-kgxs:~>
    As you can see, my user is not a member of the audio group and sound just works for me.

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