====== How to set critical power upper bound to 100% for testing ======
  * Search for "critical-power-level-spin-adjustment" in data/interfaces/xfpm-settings.ui
  * Set upper to 100
  * Search for "xfpm_settings_advanced" in settings/xfpm-settings.c
  * Replace "( val > 20 || val < 1)" with "( val > 100 || val < 1)"
  * make
  * sudo make installal level 
  * set critical level in xfce4-power-manager-settings **at least 2 points below current level** (displayed level often not up to date, compared to internal level)
  * xfce4-power-manager --restart

<note important>Lowering the critical level below the current level after xfce4-power-manager got started will not trigger any "on critical" action. (NO state change in xfpm-battery)</note>