The text in the dialog is wrong. What will wake the computer depends on BIOS settings. In my case only the power button wakes the computer and there is no way to change that. There's nothing wrong with acpi, or suspend, just the text is wrong. The second half of the sentance should be removed.
** Changed in: gnome-panel (Ubuntu) Status: Needs Info => Confirmed -- comment for "sleep" in log-out dialog says you can wake the computer up by pressing any key, but that doesn't work https://launchpad.net/malone/bugs/28527 -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs