I noticed this: My system uses SLIM. I build the new system config which includes SDDM instead, reconfigure, and at the point where SDDM service probably gets started, SDDM segfaults the current X11 session.
This is a grave error with SDDM and needs some better way of handling the initial activation of the new display manager. -- ♥Ⓐ ng0 -- https://www.inventati.org/patternsinthechaos/