Mandriva bug http://qa.mandriva.com/show_bug.cgi?id=29059

gnome-power-manager calls gtk_status_icon_set_visible several times after each change, and under kde this make the icon disappear (until another icon is added to the tray). I don't know if the bug is in GtkStatusIcon or KDE tray and will investigate later but anyway the gnome-power-manager code should be simplified.

Currently it is basically :

gpm_tray_icon_set_image_from_stock() {
  if (stock_id != NULL) {
    gtk_status_icon_set_visible (GTK_STATUS_ICON (icon->priv->status_icon), TRUE);
  } else {
    gtk_status_icon_set_visible (GTK_STATUS_ICON (icon->priv->status_icon), FALSE);
  }
}

gpm_tray_icon_show(icon, enabled) {
  gtk_status_icon_set_visible (GTK_STATUS_ICON (icon->priv->status_icon), enabled);
}

gpm_tray_icon_sync(icon) {
  if (stock_id) {
    gpm_tray_icon_set_image_from_stock (icon, stock_id);
    gpm_tray_icon_show (icon, TRUE);
  } else {
    gpm_tray_icon_show (icon, FALSE);
  }
}

I think that testing stock_id both inside and outside gpm_tray_icon_set_image_from_stock is quite useless, so is calling gtk_status_icon_set_visible from inside and from outside.

So, here are 2 patches.