Acer Chromebook C720 F24 LXDE backlight

Confirm backlight driver is intel_backlight here:

ls /sys/class/backlight/

If so, then maximum backlight setting is provided /sys/class/backlight/intel_backlight/max_brightness file. Often this setting is 15, but in the C720 it is 937.

Via command line, the backlight can be set like so:
tee /sys/class/backlight/intel_backlight/brightness <<< 500

F24 LXDE print screen

You’ll need to install imagemagick. Use dnc/yum extender.

Edit /home/[USER]/.config/openbox/lxde-rc.xml with the following:

<!-- Screenshot -->
<keybind key="Print">
<action name="Execute">
<command>sh -c "import -window root ~/Pictures/$(date '+%Y%m%d-%H%M%S').png"</command>

Follow up with
# openbox –reconfigure