Gdm: GdmDisplay: Session never registered, failing

Hi, On a recent system (Ryzen5 / NVidia Gtx1650) that I just updated to latest tumbleweed updates, I am now unable to login in gdm. The gdm login screen is displayed fine, and I can select my user and type the password which is correctly accepted. But after 1 or 2 seconds I am back on gdm login From what I could find in journactl, the corresponding error message is Gdm: GdmDisplay: Session never registered, failing I tried a couple of tricks (switch back to nouveau driver... run dracut again...) but I have not found so far how to fix it. thanks Paul