gnome-power-manager manages this if it is enabled. acpi-support checks for gnome-power-manager and defers to gpm when gpm is running.
I also have this problem. Ciao! -- laptop mode is not disabled after plugging in AC power https://launchpad.net/bugs/80331 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
