flask.session.clear()
References :
flask.session.clear - Nullege Python Samples
# vi /etc/X11/xorg.confSection "Device" Identifier "Card2" Driver "nvidia" BusID "PCI:1:0:0" Option "RegistryDwords" "EnableBrightnessControl=1" EndSection
if no /etc/X11/xorg.conf
# X :1 -configure# mv xorg.conf.new /etc/X11
boot with argument acpi_backlight=vendor
$ xbacklight -dec 20
$ xbacklight -inc 20