[MinnowBoard] How to get HDMI audio to work on MinnowBoard MAX (under Linux)?

[Berth-Olof Bergman]

Hi Gerard,

I have viewed the schematics on Minnowboard Max and the HD Audio is not connected at all. The LP Audio (Low Power Audio) is connected however.

To get HDMI audio to work, you need the get either the HD Audio or LP Audio to work. On the Minnowboard Max you thus need to use the LP Audio. The normal scenario for Linux (HD Audio and HDMI) are not available for Minnowboard Max. 

To use the LP Audio, your firmware needs to setup LP Audio correctly. You need a driver in Linux that support LP audio as well. Once you have a working LP audio in Linux it can be directed to the HDMI port.

Best regards,

B-O

> 16 jul 2015 kl. 09:02 skrev Gerard Bucas <gerard.b at tekmagic.net>:
> 
> Hi Berth-Olaf
> 
> Thanks for your response. 
> 
> Can you tell me if you have actually got HDMI audio working (eg: when playing back a video with an embedded audio track) on a minnowBoard MAX running Linux?
> 
> I have tried various firmware settings and can't seem to get it working. 
> 
> If I know it is supposed to work I can start digging a lot deeper as at this stage I sort of concluded that it simply doesn't work (maybe not implemented in hardware?). 
> 
> Does anyone know if it works on minnowBoard MAX running Windows? If yes that would of course also imply that it is a software problem as opposed to a hardware issue.
> 
> Thanks 
> 
> Gerard
> 
> 
> 
> On Jul 16, 2015, at 8:38 AM, Berth-Olof Bergman <bo.bergman at winzenttech.com <mailto:bo.bergman at winzenttech.com>> wrote:
> 
>> Hi,
>> 
>> The audio has to be enabled for HDMI by the firmware. There may be reasons why it isn’t enabled. You have 3 possible audio connections, LP audio, HD audio and HDMI audio. Regarding LP and HD audio, they share some logic and can thus not be used simultaneously. You have to choose. There could be some constraint for HDMI audio as well. You need to check with documentation. Also check the schematics and see if audio is routed to HDMI. If it is, you probably can do some settings in the firmware that makes it work.
>> 
>> Best regards,
>> 
>> B-O Bergman
>> Winzent Technologies
>> 
>>> 16 jul 2015 kl. 01:11 skrev Gerard Bucas <gerard.b at tekmagic.net <mailto:gerard.b at tekmagic.net>>:
>>> 
>>> We can’t seem to get HDMI audio to work on our minnowBoard MAX under (yocto built) linux.
>>> 
>>> For example if one plays back things like a youtube video that has audio in a Chromium browser, there is no audio on a connected HDMI device that has speakers, etc.
>>> 
>>> Any ideas on what could be the problem or whether or not this is not supposed to work for some reason or other!?
>>> 
>>> Thanks!
>>> 
>>> Gerard Bucas
>>> 
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>> 

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