saivert
commented
2 hours ago That sets the sound card output as the default output. Same as in pavucontrol. If it fails to actually set it as default for some reason then you need to check if the same happens with pavucontrol or your desktop environment sound control panel. It may be that some other policy is in effect. I'm simply writing to the default.configured.audio.sink metadata key here which is what wpctl does as well. See if you can replicate the issue with wpctl. If so it is a pipewire issue.
when hovering over this button, no information comes up (unlike the mute and 'lock channels' buttons, for example) i was digging into the code a bit and figured it might be a button to set the device as default, but that doesn't seem to be case (i toggled it on for headphones, but when i load a new video to play, it still uses my speakers)