Created attachment 117759 [details] kwin crash report see full error description here: https://bugs.kde.org/show_bug.cgi?id=402907 (I created a this new bugreport according to Christoph Feck) Short summary: Using an older nvidia graphics driver 390.87 as primary/only card and switching to virtual (text) terminals and back to gui crashes kwin (see attachment) This might be a problem related to compositing effects, because switching them off first and then returning from text to gui seems fine.
That's probably the background contrast effect, though could you please install debug packages and submit a new backtrace?
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This bug has been in NEEDSINFO status with no change for at least 30 days. The bug is now closed as RESOLVED > WORKSFORME due to lack of needed information. For more information about our bug triaging procedures please read the wiki located here: https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging Thank you for helping us make KDE software even better for everyone!