SUMMARY When bluetooth headphones autoconnect, volume doesn't change (but slider moves) when using media volume keys or moving slider in tray Volume control. When they are disconnected from bluetooth and reconnected, volume control works. Another way is to Deny the pairing in popup and pair manually via the Connect button in Bluetooth tray panel STEPS TO REPRODUCE 1. take headphones from their box so they activate bluetooth 2. a plasma notification pops up offering to pair the headphones (they are not set to trusted so I can deny it due to this bug) 3. Authoraize the pairing 4. Try to adjust volume using the volume keys or volume slider from plasma Volume systray widget OBSERVED RESULT Volume doesn't change but slider moves as if volume changed EXPECTED RESULT VOlume should adjust according to slider SOFTWARE/OS VERSIONS Linux/KDE Plasma: Gentoo 6.1.53-gentoo-r1 (64-bit) (available in About System) KDE Plasma Version: 5.27.8 KDE Frameworks Version: 5.110.0 Qt Version: 5.15.10 ADDITIONAL INFORMATION When Denying the pairing and connecting manually or disconnecting and pairing manualy, the volume control works.
This no longer seems to be an issue with plasma 6.1.4
Take that back still an issue. It is interesting that volume controlo beyond 100% works but everything from 1-100 is the same volume. Switching to speakers and back to headphones in system-tray doesn't help.