Hi all,
I've found a workaround that works: if suspend is forced with
"pm-suspend" instead of using KDE menu, all works fine and there are
no segfaults in logs.
So I wrote this script
#!/bin/bash
qdbus org.freedesktop.ScreenSaver /ScreenSaver Lock
sudo pm-suspend
pm-suspend is declared with NOPASSWD in sudoers of course