power-off button and menus disappeared from gnome-2

[sysio]

Yesterday I (almost) successfully finished migrating my laptop to systemd and after some tweaks I brought my box to work but I noticed that power options (suspend, hibernate) disappeared from gnome2 panels and menus while the power-off button on a panel is greyed. I think it could happen after removing consolekit package but I have no idea what may be the real cause of the problem.

The only possibility to shutdown the system as a non-root user is to press Ctrl-Alt-Del and to click "Power off" although the dialog window lacks of suspend and hibernate options.

Another strange effect is that after pressing the hardware power-off button I see two or more dialog windows saying that weather report and clock applets were finished abnormally but no shutdown occurs.

I ran out of ideas - every hint will be highly appreciated.

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After some time...

I've downgraded my configuration i.e:
- installed back sys-auth/consolekit-0.4.6
- recompiled gnome-base/gdm-2.20.11-r1, net-misc/networkmanager-0.9.6.4, sys-auth/pambase-20120417-r3 and x11-apps/xdm-1.1.11-r3 with USE="consolekit"
and the desired buttons returned to their place.

Is it possible to have gnome-2 with systemd and without consolekit or I have to upgrade to gnome-3 to get rid of consolekit?

Is gdm-2.20 able to function without consolekit (it seems that this is the main reason of the anomalies).