No sound on Bluetooth Audio System

• /e/ version:0.21-20220112156786
• Device model(s): Fairphone 4
• Device rooted: yes/no

Summary

No sound during playback after connecting to Bluetooth device (Device is https://www.nubert.de/nupro-x-3000-rc/p3349/) Device name in log "nubert X-2 A6E1"

The problem

Connect to Bluetooth device and start audio playback

What is the current behavior?

No audio output from Bluetooth Device

What is the expected correct behavior?

Audio from Bluetooth device

Technical informations

Relevant logs (adb logcat) btlog.log

Relevant screenshots

Solutions

Workaround

Looks like it is only a Problem with aptX HD audio enabled Here is a log without aptX and the sound works btlog_noaptX.log

Please don't close the ticket as this is only a workaround, my goal is to use aptX

Possible fixes