Case: Solus 4.3 KDE PulseAudio Audio Device Disappears After Rebooting
Case: Windows 7 loads normally under VBox. Sound controls work, etc. Solus 4.2 loads as expected and sound controls work. Solus does not register VirtualBox in the Audio Volume -> Applications tab.
Case: After logging in, the sound control icon is displayed as muted. Clicking on it to display Audio Volume settings and sliders, appears blank – no settings and sliders. Audio Volume Settings window -> Audio tab has all settings present but grayed out, no audio device detected.