I'm also seeing on upower 0.9.15-3git1 on 12.04. I don't remember this happening earlier from before my mouse showed up as a "power supply" in the applet, so perhaps there is a relation with the mouse.
I'm also seeing on upower 0.9.15-3git1 on 12.04. I don't remember this happening earlier from before my mouse showed up as a "power supply" in the applet, so perhaps there is a relation with the mouse.