After updating to Ubuntu 21.10 that includes pulseaudio 15, my bluetooth headphone could not be set to A2DP anymore. When on this setting, no sound comes out. It is still working with HFP and HSP, but with low quality of course. It was working with A2DP before.
I followed the instruction from the post below that were for 16.04, but when I did that the headphone could not connect with bluetooth anymore: After updating to 16.04, bluetooth audio A2DP mode stopped working
I also followed these instruction but without improvement: Bluetooth Headphones refuse to use A2DP High Quality
Additionally, when the Bluetooth headset receive sound, my Bluetooth mouse is sluggish (has reaction delay). I describe the problem here: Buetooth mouse sluggish when bluetooth headset on
This happens both on Wayland and Xorg sessions.