[kmarc]

Hmmm, maybe I don't get it.

When I am using the headphones, and IF an application requests microphone, THEN I do want this switch to happen automatically. After the Microphone is not needed anymore, I want it to switch back to the HQ A2DP.

Am I missing something here?

[JoshTriplett]

HSP makes the headphone quality much worse, and mono. Even while using the mic, that's not ideal. You might not notice if you're just having a conversation, but if you're sharing a video or watching/playing a game, you want the audio output quality.

[kmarc]

I understand the quality issue, of course I also notice it.

But how else would my mic work? If it stays on A2DP, then there is no Mic input, so I used to have to manually switch it to HSP. With the solution I linked above, this is not manual.

[JoshTriplett]

Your headphone would have to support A2DP input. Some headphones do.

[kmarc]

Oh alright, that would make a difference then!

So... I am not sure it does support it, TBH. I have a Bose QuietComfort 35 (II), and on linux I definitely have the low quality HSP+ mic (other thatn the quality, works well) and for listening only, A2DP is working too.

On Android though, calls are _MUCH_ higher quality with the mic on. (still somewhat different than from output-only, but less degradation than under my desktop linux)