No sound and no idea why

Forum / NoMachine for Raspberry Pi / No sound and no idea why


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    I thought I would give NoMachine a go with my new pi4.  All seemed to work okay however I cannot get it to play the sound on the pi4.  I am using the most up to date version on both devices with the client being on windows 10.

    In an afternoon of browsing I have done all of the hdmi_drive things and yet I still get no sound.  In Windows world I would expect that I might need to point the output to a specific output driver or something however the version of raspian I just downloaded does not seem to allow any audio other than AV or HDMI (mine defaults now to HDMI).

    Currently the relevant bit in config.txt looks like this. (cut and paste from the machine using NoMachine 🙂

    # uncomment if hdmi display is not detected and comp$



    # uncomment to force a specific HDMI mode (this will$




    # uncomment to force a HDMI mode rather than DVI. Th$

    # DMT (computer monitor) modes



    Any help you could give me would be gratefully received.


    Basically I have the same issue only using a plug in sound card and pulse audio.  I should see a stream but nothing is there.


    We aren’t ware of any problems with audio in RPi4 sessions.

    Are those fresh changes in the config.txt? You need to remember that the machine needs to be rebooted for changes to take effect.

    What is your Raspbian version and architecture? Did you install pulseaudio by yourself or it was installed by default? With what output devices do you have a problem – is it headphones/speakers pluged with jack or usb, or maybe is that hdmi output? Please connect to the session with NoMachine and execute commands in the terminal pactl list sinks >> /tmp/sinks.txt and pactl info | grep Default >> /tmp/sinks.txt then attach /tmp/sinks.txt file here.

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