Or wait, that's Intel graphics HDMI? Then it's a totally different bug from what I had in mind. In anyway, if you still have 5.5.y kernel, try to boot with it and check whether HDMI works. If you don't have, it may be still found in TW history repo http://download.opensuse.org/history/ Or you can my old kernel packages, OBS home:tiwai:kernel:5.5 repo, too. http://download.opensuse.org/repositories/home:/tiwai:/kernel:/5.5/standard/ If you have a working case, please take alsa-info.sh output on both working and non-working situations, and attach them to Bugzilla. Thanks.