Wired headphones produce a small and continuous hiss while the Deck is powered on. Hiss is very soft in volume, and increases in volume whenever any action is done (whether scrolling or highlighting a button, even if action doesn’t produce a UI sound).

My headphones: sony wh-1000xm5

How to reproduce:
- Plug-in headphone and cable. Leave headphones powered off.

Where/when this issue DOESN’T occur:
- When headphones are plugged into my Steam Deck LED model in the same manner
- When headphones are used with bluetooth
- When headphones are powered on (regardless whether Active Noise Cancellation is on or off)

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In desktop mode, changing audio profile from “SOF Vangogh” to “Off” eliminates the hiss. Hiss remains missing when profile change is reverted, though only up until a UI sound activated the Audio Coprocessor. Of course, this isn’t a true solution.

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This video contains audio of ambient noise as a reference. https://streamable.com/6ay1w8
This video captures audible hiss. Mic from phone is pointed toward headphone ear cup. https://streamable.com/77mevx

I should also mention that the hiss appears to correlate with UI movement. Note the following:
- Hiss is constant
- Hiss increases in volume when cursor floats above element.
- Hiss increases in volume when pop-up element appears
- Hiss returns to base volume when cursor doesn’t move
- Hiss, again, increases in volume when pop-up element expires and fades out
- Hiss, again, returns to base volume after fade-out animation ends

Please let me know if anyone of you have this issue as well.