This kernel module exposes a multicolor led device for each of the 4 keyboard zones. Note: some parts(wmi query function) are taken from hp-wmi driver.
echo "R G B" >> /sys/class/leds/keyboard\:rgb\:zone0/multi_intensity
Make all leds white.
echo "255 255 255" >> /sys/class/leds/keyboard\:rgb\:zone0/multi_intensity
echo "255 255 255" >> /sys/class/leds/keyboard\:rgb\:zone1/multi_intensity
echo "255 255 255" >> /sys/class/leds/keyboard\:rgb\:zone2/multi_intensity
echo "255 255 255" >> /sys/class/leds/keyboard\:rgb\:zone3/multi_intensity