I have tried this option

sudo gedit /etc/dbus-1/system.d/org.freedesktop.UPower.conf

and change setting

<allow  send_destination="org.freedesktop.UPower.KbdBacklight"

i have changed tag <allow> to <deny> but it didn't work.

Second option i have tried below command on terminal

 xset led 3

This command not work for me. Please help me out from this unnecessary bug.

  • 2
    Try echo 2 | sudo tee /sys/class/leds/lenovo::kbd_backlight/brightness – Kulfy Feb 4 at 21:04

At least with Thinkpad T480 model the keyboard led seems to be found under tpacpi::kbd_backlight:

So like proposed in comment section,

echo 2|sudo tee /sys/class/leds/tpacpi::kbd_backlight/brightness

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