HDMI Audio: no hw mixer

fga

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 ?.

Br,

garyw

@fga
UP-BOARD has no HW audio codec on the board, maybe you can try to use USB audio device for workaround.

Wilbert

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

fga

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.

fga

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.

Wilbert

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