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Since updating to F20, GNOME now no longer gives me any low-battery notifications, or performs any low-battery actions. When the battery runs low, it just silently continues draining until there is none left and the laptop powers off hard. Before I upgraded from F19, I got a battery (sorry) of low-power notifications, followed by hibernation. I don't know how to make this report any more useful, sorry. But please let me know how to give you the information you need to fix it, since I'm losing work at least once per day thanks to this bug.
based on upstream comment this bug looks fixed already. https://bugzilla.gnome.org/show_bug.cgi?id=709576#c15