Comment 42 for bug 529052

I was also having the same problem in fluxbox (see bug #531339 for screenshot). In the last days, anyways, with the updates, the behavior has changed, but is not entirely fixed. I can report the following situation:

With AC adapter:
 * Start g-p-m. No problems/warnings on console during the entire lifetime of g-p-m
 * The icon displays OK in the systray.
 * When switching to battery, the icon goes and come back about 3 times, to finally dissapear
 * When switching back to AC, the icon comes and go about 3 times, to finally stay

With battery:
 * Start g-p-m. Got a warning (the only one during the lifetime of g-p-m):
(gnome-power-manager:6329): GLib-GObject-WARNING **: value "-nan" of type `gdouble' is invalid or out of range for property `percentage' of type `gdouble'
 * The icon displays OK in the systray.
 * Same behavior as explained before with AC adapter, but now icon stays while on battery, and hides when on AC.

Hope this helps.

Rodrigo