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Thread: Ubuntu 18.04 not recognising sound hardware, showing dummy output

  1. #1
    Join Date
    Mar 2013
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    8

    Exclamation Ubuntu 18.04 not recognising sound hardware, showing dummy output

    Here is my alsa setup, please advise as I have removed and reinstalled ALSA and also installed generic sound drivers for ubuntu:

    http://alsa-project.org/db/?f=508f12...7429dd21ed8501

    Now ubuntu 18.04 not seeing my built in sound card on ASRock FM2A55M-DGS (5.1 CH HD Audio (Realtek ALC662 Audio Codec))
    Problem started because I could only get stereo 2 channel with default ubuntu install, so tried to get Realtek drivers so I could access full 5.1 surround sound.

  2. #2
    Join Date
    Jun 2007
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    14,486

    Re: Ubuntu 18.04 not recognising sound hardware, showing dummy output

    so tried to get Realtek drivers
    1. Remove the Realtek drivers by running make uninstall in the appropriate directory. For instance, if you used your Downloads folder:
    Code:
    cd ~/Downloads/Rt-Linux-HDaudio-5.18/alsa-driver-RTv5.18/alsa
    sudo make uninstall
    2. Reinstall the linux-modules packages:
    Code:
    sudo apt-get install --reinstall linux-modules-`uname -r` linux-modules-extra-`uname -r`
    3. Reboot.
    Is sound back?
    Last edited by Yellow Pasque; March 17th, 2020 at 03:03 AM.

  3. #3
    Join Date
    Mar 2013
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    8

    Re: Ubuntu 18.04 not recognising sound hardware, showing dummy output

    Step 1.

    sean@ubuntuPC:~/Downloads/Rt-Linux-HDaudio-5.18/alsa-driver-RTv5.18/alsa$ sudo make uninstall
    [sudo] password for sean:
    rm -rf /include/sound
    rm -f /snd*.o /persist.o /isapnp.o
    rm -f /sbin/init.d/alsasound
    rm -f /etc/rc.d/init.d/alsasound
    rm -f /etc/init.d/alsasound

    Step 2. reinstall the linux modules packages.

    Step 3. Rebooting....

    Thanks Yellow Pasque now sound settings show both hdmi and line out again.
    Line Out is still only Analog Stereo Output, is it possible to use the full potential of this output, on windows it is 5.1 Surround Sound?

  4. #4
    Join Date
    Feb 2008
    Location
    Texas
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    29,647
    Distro
    Ubuntu 20.04 Focal Fossa

    Re: Ubuntu 18.04 not recognising sound hardware, showing dummy output

    For users that may try the commands in the above post please be aware that the commands are dangerous if done in the wrong directory or with certain options you could wipe out your entire system.
    Last edited by wildmanne39; March 17th, 2020 at 02:57 AM.

  5. #5
    Join Date
    Jun 2007
    Beans
    14,486

    Re: Ubuntu 18.04 not recognising sound hardware, showing dummy output

    Quote Originally Posted by mrsean View Post
    Line Out is still only Analog Stereo Output, is it possible to use the full potential of this output, on windows it is 5.1 Surround Sound?
    Can you run the alsa info script again? Are you playing actual surround sound sources or are you trying to create a surround effect by copying output to the rear speakers?

    Quote Originally Posted by wildmanne
    For users that may try the commands in the above post please be aware that the commands are dangerous if done in the wrong directory or with certain options you could wipe out your entire system.
    Sorry about that. I've edited it to be more specific. Hopefully, it's (a little) better.

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