SUMMARY After connection to my device, so ATH-ANC900BT, I can see it was recognized as "Audio device". I can see also audio control buttons line (play, pause, etc.). It doesn't work even I link this device to play audio for given application, for example Firefox, Clementine. When I click onto "Pause" button then happens nothing I tried also turn on "Media Player" in Task Bar, but it didn't help STEPS TO REPRODUCE 1. connect audio device via bluetooth 2. link it with source of sound, for example Firefox 3. start playing sound in given application 4. open proper device in Bluetooth and click "Pause" button OBSERVED RESULT clicking onto buttons doesn't bring any effect EXPECTED RESULT clicking onto buttons should allow control of audio, so i.e. pause of it SOFTWARE/OS VERSIONS Linux/KDE Plasma: (available in About System) KDE Plasma Version: 5.24.4 KDE Frameworks Version: 5.92 Qt Version: 5.15.3 ADDITIONAL INFORMATION