It occurred to an acer laptop some day ago, but it was running kpowersave and not gnome-power-power-manager. Disabling kpowersave in the kde control center, and running gnome-power-manager solved the problem.
-- after suspend, power button causes power off https://launchpad.net/bugs/2882 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs