Unable to wake with external keyboard while lid is closed

Solution 1:

This related answer might be helpful:

• Wake up from suspend using wireless USB keyboard or mouse (for any Linux Distro)

You don't mention if your keyboard is wired or wireless. The basic steps are:

grep . /sys/bus/usb/devices/*/power/wakeup

And then (assuming 8 ports are returned) use:

sudo su
echo enabled > /sys/bus/usb/devices/usb1/power/wakeup
echo enabled > /sys/bus/usb/devices/usb2/power/wakeup
echo enabled > /sys/bus/usb/devices/usb3/power/wakeup
echo enabled > /sys/bus/usb/devices/usb4/power/wakeup
echo enabled > /sys/bus/usb/devices/usb5/power/wakeup
echo enabled > /sys/bus/usb/devices/usb6/power/wakeup
echo enabled > /sys/bus/usb/devices/usb7/power/wakeup
echo enabled > /sys/bus/usb/devices/usb8/power/wakeup
exit

See the accepted answer for all the steps.