Audio Noise through Gnome control centre for Left and Right Channel

Desktop
1

Hi Gnome Team,
We are using a custom RISC-V board running Ubuntu 22.04. The system supports two audio playback interfaces: HDMI and a speaker output via a 3.5mm jack connected to the ES8389 codec.
We are observing an issue where noise is introduced on the speaker output (3.5mm jack) during left/right channel testing using the GNOME Sound Control Panel (GUI) (and noise is inconsistent and observing noise spradically) Interestingly, the noise disappears automatically if the sound settings panel is closed and reopened.
However, when performing the same left/right channel test using the speaker-test utility from the terminal, the issue is not reproducible, and the audio output remains clean.
This behavior suggests a difference in how the GNOME audio stack (likely PipeWire/PulseAudio) configures or manages the audio path compared to direct ALSA playback via speaker-test.
We would appreciate guidance on identifying the root cause of this issue and recommendations for resolving it.

Regards,
Sharath

2

Hi! Sadly version of GNOME Ubuntu 22.04 is using is too ancient and is not supported for a long time now. You may have better luck with Ubuntu forums, or just updating your system to newer version

3

The control panel turns on the microphone to show the current input level in the UI. So my suspicion would be that enabling the microphone has the side effect of introducing the noise for some reason.