Only suspicious errors in logs were
[config/dbus] couldn’t register object path

Most straightforward option for me seemed to be downgrading again to kde 3.5.9, but after that problem still occured and is described here and here.

Before you try above solutions first create new user (with no files in his HOME directory) and try to log in onto his account. If this works then the cause of your problem is some old/wrong config files in $HOME.

Unfortunately I don’t know which file was causing problem in my case but for sure it was not any file from .kde* directory (and previously only that files I had checked)

…almost three weeks of using xdm… (additionaly “turn off” option also dissapeard so in order to shutdown system I had to “poweroff” from root (saving session in kde obviously does not work in that case)).

Having that fixed I’m going to try on kde 4.2 soon again.

Tags: consolekit, gentoo, kdm, [config/dbus] couldn't register object path