XFCE Power Manager
http://goodies.xfce.org/projects/applications/xfce4-power-manager
battery
<_description>Modify the laptop display brightness
<_message>Authentication is required to modify the laptop display brightness
no
no
yes
@sbindir@/xfpm-power-backlight-helper
<_description>Suspend or hibernate the system
<_message>Authentication is required to place the system in suspend or hibernate mode
auth_admin
auth_admin
yes
@sbindir@/xfce4-pm-helper