lukasjapan/bt-speaker

AVRCP with iPhone: Strange Volume behaviour

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Thank you for this piece of software, it's just fantastic. Love the simplicity, especially compared to other solutions! ๐Ÿ˜Š

I've got a strange issue with AVRCP from my iPhone running iOS11:
I always output the sound through the audio jack, so I set cardindex = 1. If I connect from macOS I can set the volume remotly without problems. With the iPhone I can also set volume, but if its set to 48% or above output switches to HDMI (iPhone jumps 6%, from 42>48% on 1 button press). When I set to 42% or lower it switches back to jack since I've set that in config.

Any idea where to search for debug?

Even if i disable alsa, it switches from jack to HDMI and back between 42 and 48%. Any idea what's going on here?