Bug#456541: Unplugging causes... [SOLVED]

[Neil Van Dyke]

I had manually changed the gconf settings shortly after reporting the 
problem myself, and was still seeing erratic AC->battery behavior.  
(Before updating gnome-power-manager, power management on my ThinkPad 
T42 had been perfect.)

I am not able to verify Carlos' solution at this time, since, by strange 
coincidence, my LCD backlight has stopped working.

It is conceivable that the power-management strangeness wore out the 
backlight tube, which previously had shown no signs of degradation, but 
that would be surprising.