Bluetooth sound going the wrong way between Linux and projector

OK, this seems like a dumb problem... I paired a Kubuntu PC to an Android TV projector. I wanted to play some music on the PC and hear it on the (good sound quality) projector. I already do that between my phone and the projector... But here the sound is going the wrong way: sound from the projector are played on the PC puny speakers ! I don't see any options to change direction in the KDE Bluetooth options. Edit: I've tried from 2 other Kubuntu laptops, they all have the sound going the wrong way after pairing. BT on laptop says the projector is a Multimedia Device . How do I change it to Hea

Question by dargaud on Super User, licensed CC BY-SA. We show a short excerpt and link to the original thread as credit.