HDMI Audio: no hw mixer

fga
fga New Member Posts: 3 ✭
in UP Board Linux

Hi,

We are able to use HDMI with audio using kernel driver snd_hdmi_lpe_audio, but it looks like the audio card does not define any controls, so it is not possible to have multiple
sources streaming towards HDMI/audio concurrently.
Has anyone had the same problem ? Is there a way to solve this ?.

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  • Wilbert
    Wilbert New Member Posts: 168 ✭✭✭

    Hi Sir,

    Please make sure your connected device supports HDMI Audio.
    I assisted in testing a lot of things here, and confirmed that if the connected screen does not have a speaker, there will be no Audio device under Linux, including the way of using an adapter.
    If there is a monitor that supports speakers, or an adapter that supports Audio, there will be an Audio device available for use.

    Best Regards,
    Wilbert Lee

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  • fga
    fga New Member Posts: 3 ✭

    Let me rephrase a bit the problem:

    • Streaming the audio through HDMI works (obviously using a screen with speakers), but we cannot concurrently stream audio to the HDMI (something required with most webrtc apps).
    • Defining an Alsa dmix PCM does not help either, since without hardware support the up-board does not cope with the heavy computing required by software-only mixing solutions.
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  • fga
    fga New Member Posts: 3 ✭

    Thanks @garyw . It looks however as a dead-end for us, since we need to use a wireless HDMI dongle to stream video and audio to a remote screen.

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  • Wilbert
    Wilbert New Member Posts: 168 ✭✭✭

    Hi Sir,

    You can try to refer to the following URL, there are adjustments for HDMI, can it solve your problem?
    https://github.com/up-board/up-community/wiki/Ubuntu_18.04

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