[Bug 33820] Pressing power button displays dialog, it does not switch off computer

[moreati]

Public bug report changed:
https://launchpad.net/malone/bugs/33820

Description changed to:
    In Dapper Flight 4 pressing the ACPI power button doesn't switch off
    the computer as expected.

    Instead it presents a modal dialog asking whether I wish to shut
    down/reboot/logout/switch user.

    This is contrary to Windows, Breezy, every other Distribution I know
    and my long established expectation. If I press the power button,
    ever, it is to switch it off _now_. There is no ambiguity in my
    mind. It isn't easy to depress the power button without intending
    to.

    The last thing I want is a dialog asking 'Didn't you want to logout
    or do something else, unrelated to pressing the power button?'. If I
    wanted that, I'd go to Microsoft.