For few days now, pressing the power button of my Thinkpad T30, instead of
asking whether I want to shutdown or restart the machine, gradually darkens the
screen a little, then stops darkening and hangs in this state forever. No window
is shown, no keys work, no visible (behind the "dark glass", but visible)
windows show any updates. I can move the mouse cursor, though.

In this state, all I can do is kill X using alt-ctrl-backspace. I can also
switch to tty1 and kill gnome-session, or switch back to vt 7, where I see some
screen corruption at the top, which doesn't refresh to proper screen content.

On tty1 I checked if some program is looping taking whole CPU, but nothing like
that takes place.

I also checked for some messages in Xorg.0.log (suspecting "radeon" driver bug),
but it doesn't change between before and after pushing the button.

If I set the button function to suspend, it suspends without problem. Only
"asking" locks my session for good.

Everything used to work in FC7t4, but stopped with some of this week's updates
(which included gnome-power-manager, gnome-session and xorg-x11-server-Xorg,
every one of them is suspected). Now it's reproducible every time, so I can
provide every information you need.