Created attachment 1149839 [details] backtrace of the sddm-greeter crash I installed from the F23 KDE i686 live image, then updated to latest stable F23 packages, removed knode, and did dnf system-upgrade to F24 with updates-testing enabled. Upgrade ran successfully and the upgraded system boots, but sddm displays only this: https://www.happyassassin.net/temp/sddm24.png and abrt records an sddm-greeter crash. Attaching the backtrace for the crash.
*** This bug has been marked as a duplicate of bug 1329715 ***