Randomly Not Able To Mute My Bluetooth Audio Device With Physical Volume Controls After Connection Is Made

[NKkrisz]

Your system information

• Steam client version: 1730853027
• SteamOS version: 3.6.20
• Opted into Steam client beta?: No
• Opted into SteamOS beta?: No
• Have you checked for updates in Settings > System?: Yes
• Steam Deck LCD (64GB Black Shielded Revision)

Please describe your issue in as much detail as possible:

I randomly can't fully mute my Bluetooth earbuds after connection is made without using the QAM slider to temporarily fix it.
The volume slider doesn't go fully to the left / mute and remains on a tiny value.

Steps for reproducing this issue:

1. This tested in Game Mode.
2. Try connecting a Bluetooth audio device (In my case it's Sony Linkbuds S that isn't trying to connect to anything else) with a volume value previously set that isn't mute (?) (Sometimes I see the volume slider slightly moving that will be different from previously set volume after connection is made)
3. Try adjusting the volume back to left / mute with physical volume buttons on the top of the Deck.
4. The volume slider doesn't go fully to the left / mute.

If the issue doesn't occur, repeat Step 2 & Step 3 until it does (seems to happen randomly for me).

Temporary fix: use QAM Volume slider to set to mute then it works properly again.

(I also tried disabling 3rd party CSS and Audio modifications which didn't help and I didn't make new screenshots.)