IMX8MP ANDOIRD too low HDMI sound

[shiva141]

Hi,

We are able to hear  output through HDMI, but if the media volume is adjusted below 50%, the sound becomes barely audible.

Settings -> Sound & Vibration -> Media Volume

Audio HDMI is registered under 

[ 13.899336] input: audio-hdmi HDMI Jack as /devices/platform/sound-hdmi/sound/card2/input2

We tried tinymix we didnt get any results.

evk_8mp:/ # tinymix -D 2
Mixer name: 'audio-hdmi'
Number of controls: 5
ctl type num name value

0 BOOL 1 HDMI Jack On
1 INT 8 Playback Channel Map 0 0 0 0 0 0 0 0
2 IEC958 1 IEC958 Playback Mask unknown
3 IEC958 1 IEC958 Playback Default unknown
4 BYTE 128 ELD 10 00 08 00 6b 10 .. .. .. .. .. .. 

Is there any suggestion to increase the HDMI-audio threshold so that audible sound  when below  50%.

[shiva141]

Hi
we added audio_gain_config.xml using device.mk in our asop image.
PRODUCT_COPY_FILES += \
$(IMX_DEVICE_PATH)/audio_gain_config.xml:/system/etc/audio_gain_config.xml


on target we found the audio_gain_config.xml
# ls /system/etc/audio_*
/system/etc/audio_effects.conf /system/etc/audio_gain_config.xml

issue persist , Please share what is next step

[Zhiming_Liu]

Hi

It looks like you need add audo gain config file in your aosp image, not prebuilt image.

https://github.com/Nemirtingas/android_device_samsung_grandprimevelte/blob/lineage-13.0/configs/audi...

Best Regards
Zhiming

[shiva141]

Hi ,

I would like to add 

- Target -imx8mp-evk

- prebuilt image from NXP  - android-13.0.0_2.0.0_image_8mpevk