SUMMARY I have bose on ear wireless headphones. When no music plays headphones goes to some sleep mode while still connected. This mode is huge battery saver. But with kmail running there are always ON, which means battery drains STEPS TO REPRODUCE 1. Connect bluetooth headphones 2. Start kmail OBSERVED RESULT Can hear noise in headphones. It looks like kmail opens some sound stream on start. EXPECTED RESULT When start kmail, headphones stays off, because no sound plays. SOFTWARE/OS VERSIONS Linux/KDE Plasma: openSUSE Tumbleweed (available in About System) KDE Plasma Version: 5.18.5 KDE Frameworks Version: 5.70.0 Qt Version: 5.14.1
Could be because of QtWebEngine. Please test if this also happens if you start the Falkon browser.
OK, openSUSE Tumbleweed was upgraded to QT 5.15 and problems are gone. I think we can close this issue. Thanks
Thanks for the update; changing status.
The right reason was process named speech-dispatcher-dummy. I couldn't find kmail option to disable tts, but this command resolved all problems: mkdir -p ~/.config/speech-dispatcher && echo "DisableAutoSpawn" >> ~/.config/speech-dispatcher/speechd.conf