This script controll keyboard backlight on IBM ThinkPad X-series

ThinkLight

#!/bin/bash

# Vadim Zaliva [email protected]
# based on https://gist.github.com/hadess/6847281

if [[ $EUID -ne 0 ]]; then
   echo "This script must be run as root" 1>&2
   exit 1
fi


usage() {
   echo "This script controll keyboard backlight on IBM ThinkPad X-series"
   echo "Usage: ThinkLight [0|1|2]"
   echo "   0 - off"
   echo "   1 - medium"
   echo "   2 - full"
}

if [ "$#" -ne 1 ];then
   usage
   exit 1
fi

case "$1" in
        0)
            b="\x03"
            ;;
        1)
            b="\x43"
            ;;
        2)
            b="\x83"
            ;;
        *)
            usage
            exit 1
esac


sudo modprobe -r ec_sys
sudo modprobe ec_sys write_support=1

echo -n -e "$b" | sudo dd of="/sys/kernel/debug/ec/ec0/io" bs=1 seek=13 count=1 conv=notrunc 2> /dev/null

@razvan9921 copy and paste into .sh, then chmod +x .sh, then sudo ./.sh 0|1|2

Works on P52. Thank you!

Works perfectly with ubuntu 18.04 on t480s! Thank you!

Thanks for the many insights!
Kinda works on my Ideapad Flex 5i (14iil05)
address is 0xc2 (194 dec) and values are 0x00, 0x01 and 0x02 for off, low, hi, respectively.
echo -n -e 1 | sudo dd of="/sys/kernel/debug/ec/ec0/io" bs=1 seek=194 count=1 conv=notrunc
also, address 0xcc (204 dec) seems to report the current state of the kb backlit (0x50 = off; 0x70 = on) but writing to it does nothing =|
is there an address for the backlight timeout?

Doesn't seem to work on Lenovo E480

@omamkaz Sorry I do not have this model to test and help. For what it's worth it does not work on my Carbon X1 either.
But you can use Fn+SPACE keyboard sequence.

Fn+SPACE also Not work!, Thanks for your response

@vzaliva are you know where I can find some solution for this problem

@omamkaz sorry, I do not know. I think Fn+SPACE was supported in firmware. Try to boot windows and see if it works there. Perhaps you have a hardware problem.

@omamkaz sorry, I do not know. I think Fn+SPACE was supported in firmware. Try to boot windows and see if it works there. Perhaps you have a hardware problem.

Ok, Thanks

Thanks for the many insights!
Kinda works on my ThinkBook 14 G2 ITL (20VD00CNRA)
address is 3 dec and values are 0x1c, 0x1d and 0x1e for off, low, hi, respectively.
echo -n -e "\x1c" | sudo dd of="/sys/kernel/debug/ec/ec0/io" bs=1 seek=3 count=1 conv=notrunc

Thanks for the many insights! Kinda works on my ThinkBook 14 G2 ITL (20VD00CNRA) address is 3 dec and values are 0x1c, 0x1d and 0x1e for off, low, hi, respectively. echo -n -e "\x1c" | sudo dd of="/sys/kernel/debug/ec/ec0/io" bs=1 seek=3 count=1 conv=notrunc

How do you determine if your addresses and values are different and what they actually are?