To conclude, I got the ivoler one, work perfectly !

I fix it by pluging the speakers directly to the screen, and not the steam deck. Was probably static sound.

Only in video ! Game work normally. How can I can change those settings in desktop mode ?

I have two hdmi cable, it does the same !

Still waiting for a good promo to update mine !

Tested to be sure, but it doesn’t work unfortunately !

I made a small video to show it. (Video is upside down for some reason)

To describe a bit more, you can see the setup in this picture.

I didn’t had any problem with the speaker when there were plugged in my PC.

You can say the parasite sound is playing when there were no sound for a “long” time.

It’s not a UI sounds, it’s a static sound, same as if you plug speaker when on.