Audio is not working properly

santisg

Hi everyone,

When I play any type of audio in ubuntu it sounds noisy. It happens everywhere (browser, player, etc.). In Android it works perfectly. Is this normal?

Thanks.

mbt28

Hello,

Could you please provide more information about the noise? Is it kind of coil/whine sound at the backend?

santisg

Yes we can say it's like whine. I'm attaching some recordings that will help to understand:

This is how it sounds in android:
https://drive.google.com/file/d/ ... W8/view?usp=sharing

This is how it sounds in ubuntu:
https://drive.google.com/file/d/ ... HM/view?usp=sharing

I'm using the shipping firmware which I've reburned with same results:
Firefly-RK3288_DualBoot_201501271613.7z

Thank you very much and sorry it took me so long to reply.

santisg

Hi again,

I've tested the xubuntu image posted here and sound is working properly:
http://bbs.t-firefly.com/forum.p ... &extra=page%3D1

So it seems to be an issue the shipping image.. I am the only one?

Thanks.

sweckhoff

They are doing noise suppression in the HAL using Speex.  That would make a difference.

Sladoeg

I have the same issue with audio on T-Firefly RK3288 board and I have tried to flash different images, but for me it does not solve the problem. Same audio noise in HD youtube videos.

In WebRTC application I cannot get any sound from the analog output, but sometimes I can get the sound with noise exactly according the samples above.
https://janus.conf.meetecho.com/videoroomtest.html.

According my testing experience, there is the issue with Rockchip soundcard as Alsa drivers cannot fully support it.

For example, at the alsamixer control panel the Output2 level works incorrect, using the value of more than 3 points fully mutes the noisy sound from analog output jack.

Does anybody know how to fix the sound issue in RK3288 Firefly linux distributions?
The best way is to create new updated image of firmware by T-Firefly support team.

Thank you in advance.