I'm having the following problem on two machines which had Mageia 4 with the proprietary Nvidia driver.
The upgrade installed nvidia-current but the cards are no longer supported. I uninstalled these packages and installed the nvidia340 ones. On boot I get the starry splash screen but at the point where I should get the display manager it reverts back to the text virtual terminal.
If I log in as root and restart prefdm.service the Display Manager starts correctly and I can log in. I've captured the service status for prefdm and systemd-logind along with errors from Xorg.log.
For my work system this isn't too much of a problem (I reboot very rarely), for my home machine it's a pain as I have to manually restart prefdm every time.
Any pointers appreciated.