This multi-boot machine runs three separate instances of openSUSE - Leap 15.3 (default); Leap 15.2 (deprecated); Tumbleweed (for fun) Each installation uses the KDE Plasma desktop Recently – I can’t say exactly when but in the last few days – I‘ve lost sound in the 15.3 default installation. 15.2 and Tumbleweed remain OK. In each of the three cases including 15.3, KDE’s Audio module in System Settings reports “built-in audio” (from the motherboard), with output analogue stereo. Oddly, perhaps, the Yast sound module shows the soundcard as “not configured” in all three.* What I don’t get is how sound can work without configuring the sound card through YAST in two of the installations but not the third. More particularly, I can’t see what might have changed in the 15.3 installation to stop it working, where it worked until recently. Any suggestions? Preferably in words of one syllable, since I’m a bear of very little brain. ……………….. *Any attempt to recover the situation by configuring the card through YAST in the 15.3 installation returns “An error occurred during the installation of Comet Lake PCH cAVS. The kernel module snd-sof-pci for sound support could not be loaded. This can be caused by incorrect module parameters, including invalid IO or IRQ parameters.” -- Robin K Wellington "Harbour City" New Zealand