How to use HDMI audio?

Chip Platform Rockchip
1

The analog audio is working fine, but no matter what I do, I cannot seem to get the HDMI audio to output to my sound system at all.

I used to have this problem with Raspberry Pi, but was able to change something in boot.txt to force it to always emit audio no matter if it can detect that it should or not. Maybe I need a similar change here?

Can anyone help me to get HDMI audio output working with my firefly?

2

Hi
Have you try PulseAudio Volume Control?

3

@isle yes, I have. It’s exactly the same behaviour. My amp doesn’t even show the audio LEDs, so I’m pretty confident that the audio mode of the HDMI output is not even being enabled. I need some way to get it to ignore the EDID or similar, I think, just like with my Raspberry Pi

4

How can I change the kernel command line issued by the bootloader? I think that may hold the answer.

5

Ok, I figured out how to change kernel command line with rkflashtool – tried adding hdmi.audio=1 as I had seen for sunxi, but no change, so apparently that is not the parameter name for rockchip (surprise, surprise).

Are there good docs on what arguments the rockchip kernel wants somewhere?

6

Hi
which firmware did you use? or did you make it by yourself ?

7

@isle I’m using the latest dual-boot firmware image

8

When I play audio over the RKSPDIFCARD device the light on the optical port comes on, and it goes off again when the audio stops. So something is happening. But not hearing anything over HDMI and no lights on my amp to show that it’s receiving any audio signal.

9

I just booted to the Android, just to try that. No matter what audio device I pick, sound comes out of the analog port and nothing over HDMI.

10

Hi
did the system recognised the HDMI sound card when you insert your sound system?
what did you get from “cat /proc/asound/cards”?

11

現代生活の速いペースの途方もないストレスの下で、220-1202証明書を学ぶことに固執することは、競争力のある人間として自分を証明するために必要になります。 220-1202練習問題は、最も有用な試験サポート資料として一般的に知られており、グローバルなインターネットストアフロントから入手できます。長年の努力の末、当社の220-1202試験の資料とサービスは、膨大な数のお客様から評価と称賛を受けました。ますます多くの受験者が試験計画ユーティリティとして220-1202学習教材を選択します。

12

Thank you for sharing this incredible article, it’s truly breathtaking! The CTFL-UT practice test pdf content is impressive, and it’s available to you at no cost.

13

I’m very thankful for your article, it left a lasting impression. Free access to the RePA_Sales_S authorized exam dumps test materials. Best of luck on your exams!