Version: (using Devel) Installed from: Compiled sources xserver crashes often when trying to change plasma/plasmoids/desktop settings. I had this on 4.1.x and now on 4.2beta1 (4.1.80). Kubuntu 8.10, 64bit, nvidia driver 177.80 and 180.11beta Steps to reproduce: - right click on desktop - appearance settings - wait a few seconds (or click on design select box) -> crash
Created attachment 29121 [details] xorg.log
Created attachment 29122 [details] gdb, but not much info in it i think
I once reported a similar (maybe the same) bug on launchpad, i dont know why i got more gdb output on that day: https://bugs.launchpad.net/kdelibs/+bug/290799
According to your Xorg.0.log your crash is in the X driver for your video card. (Plasma can't crash X directly, but it can expose bugs in the video drivers.)
Just tested a bit further. Disabling triplebuffer seems to solve the crash, so you seem to be right. Had that in my config since long time, as i read it should improve performance on nvidia cards (the old known issue, that should be gone now with actual drivers.) But maybe that helps someone finding this bug report.