Created attachment 73555 [details] proposed patch kwin crashes on xrandr event . from src/Xrandr.c switch (event->type - info->codes->first_event) { case RRScreenChangeNotify: scevent = (XRRScreenChangeNotifyEvent *) event; snum = XRRRootToScreen(dpy, ((XRRScreenChangeNotifyEvent *) event)->root); <--- snum is returned as -1 here on nx server if (scevent->rotation & (RR_Rotate_90 | RR_Rotate_270)) { dpy->screens[snum].width = scevent->height; reference: https://bugs.launchpad.net/ubuntu/+source/libxfixes/+bug/985202
Seems to be fixed by commit 4e4bbb85499cff052ce03e173b88f1083ba83f86
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