GPU lockup after upgrade from 11 to 12

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http://forums.fedoraforum.org – Hi, I just upgraded from F11 to F12 and get this error: [drm] nouveau 0000:01:00.0 GPU lockup - switching to software fbcon With Ctl-F2 I can switch to console and login, so the system is running. Anyone else with this problem and/or solution? Thanks. "ps -ef | grep Xsession" shows constant changing pid for Xsession, so I guess Xsession is continuously being restarted for some reason. (HowTos)