Hi everyone!
I have some issues with sound in my laptop. When charger is plugged in, battery is full and there is no source of sound, there is very loud and irregular buzzing in headphones. To add salt to injury, even when this hiss isn't present there is a 2nd one although much quieter and less annoying - sounds like a regular coil whine - and this one persists even when disconnected from power grid/something is playing. It only occurs in stuff plugged into audio jack. External DAC sounds like a dream.
I tried to mitigate it with *sudo tee /etc/modprobe.d/snd-hda-intel.conf <<<'options snd-hda-intel power_save=0'* command and it changed nothing. Also tried to mute built-in microphone in pavucontrol to no avail.
I believe it isn't problem with ground loop or anything like that as I didn't experience it in Windows/majority of live ISOs.

But! I figured out a way to make it stop:
When *nvidia-settings* is open, all the noise stops. I assume it's the GPU's fault then.
So, does anyone have an idea how to achieve this behavior without having to keep nvidia-settings open or/and why this is at all happening?
I don't know what info can be useful but I'm using Acer Nitro 5 AN515-55 (Intel i5-10300H with NVIDIA GeForce RTX 3060 Mobile), ArchLinux, pipewire/wireplumber/alsa, LXQt

Thanks for reading and thank you in advance for trying to help! <3
Cheers

Hello, kozak243 & welcome to LQ.

You might have a simple way out of this. In a console, run 'sudo alsamixer'
You'll find a page there (F6?) where it puts up a slider for all the inputs and outputs. Mute the microphone boost and half the outputs. If the sound hasn't stopped, unmute them and mute the other half. Then you can narrow it down. I don't know pipewire, socan't suggest anything clever there.

It's worth noting that noises at those frequencies can come from dud capacitors also. Nvidia settings might ground the inputs to the onboard sound, presuming the video has a hdmi or display port output.

Hi, business_kid!
I tried what you suggested. I muted/brought to 0 everything in alsamixer and (with turned off sound and all there is) the noise was unaffected so I didn't even play with it further. Changing 'master' just added pops with every step in volume on top of buzz on top of buzz ^^7
And yes, this laptop has HDMI port built-in so you are probably correct about grounding. I don't know if it matters but this port isn't - and never was - used. For me 1 display is more than enough.