[Techtalk] Automatic shutdown when pressing power button

[Tiera]

Hi!

We have a mythtv box at home. We used to have Ubuntu hoary with gnome on
it. When we had that we could press the power button on the computer and
that would shut down the system nicely, ie not just killing the power,
it would shut down just as if you had written "shutdown -h now". We've
now upgraded the box to Ubuntu Breezy and fluxbox instead of gnome. The
nice power button functionality we had before doesn't work anymore now.
I'm guessing gnome had something to do with it, but I'm not sure. I'm
not even sure what you would call this functionality so I don't know
what to google for. Does anyone have any pointers? I would love to be
able to shut down the box properly by just pressing the power button again.

/Tiera