SUMMARY STEPS TO REPRODUCE 1. Set up KDE to operate on 2 screens. Primary screen is screen #2, on the right. Secondary screen is to the left, rotated 90 degrees. Login is to occur on the primary screen. Sound should come out of the primary screen. 2. Set up sound to use HDMI output. Use PulseAudio Volume Control to select HDMI out and the primary screen for output. OBSERVED RESULT Half the time there is no sound and one has to go to the sound widget in panel and select HDMI as the Default Device. (The Default Device icon is messed up as well.) Every time the computer is rebooted the sound will default back to screen #1. The user must open PulseAudio Volume Control and reset the audio to come out of the primary screen. Sometimes this happens every time the computer goes to sleep and/or every time you log out. Thus every reboot or sleep you have to go in and reset and fiddle with the HDMI audio settings. EXPECTED RESULT 1) The HDMI output device should be retained across reboots, sleep, logouts, etc. 2) The selection of HDMI audio as the default should be retained across reboots, sleep, logouts, etc. SOFTWARE/OS VERSIONS Operating System: Fedora 32 KDE Plasma Version: 5.18.5 KDE Frameworks Version: 5.70.0 Qt Version: 5.13.2 Kernel Version: 5.6.16-300.fc32.x86_64 OS Type: 64-bit Processors: 12 × AMD Ryzen 5 3600X 6-Core Processor Memory: 62.8 GiB of RAM ADDITIONAL INFORMATION Video card and driver independent. Happens with both Intel and NVidia display adapters and Intel, nouveau and Nvidia drivers.
I can also confirm the bug. SOFTWARE/OS VERSIONS Operating System: openSUSE Tumbleweed 20210502 KDE Plasma Version: 5.21.4 KDE Frameworks Version: 5.81.0 Qt Version: 5.15.2 Kernel Version: 5.12.0-2-default OS Type: 64-bit Graphics Platform: X11 Processors: 8 × AMD Ryzen 7 4700U with Radeon Graphics Memory: 15.0 GiB of RAM Graphics Processor: AMD RENOIR
The setting should be able to be saved now.