I have HDMI Sony wireless headphones. Connected between my Multimedia stereo monitor and laptop. Issue is that I cant get auto switch sound in headphones then base station is on and restore it back. I have to do it manually. Second problem is channels. In Ubuntu Unity I can easily set 7.1 for headphones, but in KDE I can do only stereo(just no any options about this), once after boot with enabled headphones I've got 7.1 in sound output selection, but not sound! Any workaround ?? Suggestions?

KDE Plasma 5.9.4
KDE Frameworks 5.31.0