I don't know exactly, it is in the menu under the battery icon in the Indicator Applet, which can be configured by the Gnome Power Management. So, it's indeed a good question. It will be probably a gnome error.
I don't know exactly, it is in the menu under the battery icon in the Indicator Applet, which can be configured by the Gnome Power Management. So, it's indeed a good question. It will be probably a gnome error.