Please mention whether you’re on stable, beta, or a different update channel. There’s a good chance most bugs on the stable update channel have been fixed already, so anyone on the beta update can let people know if the bug they’re facing is already fixed.
My problem is not headphone specific but Bluetooth specific. It boils down to one of these questions, where there are multiple of to find. My deck also does not provite an answer and I can hear the audio quality difference massively between A2DP and other Codecs.
What kind of Daw are you using on Linux btw? I only know of Bitwig with Linux support. And I still did not get around to giving that a proper try.