Comment 101 for bug 1510344

Cristian Contescu (ckristi) wrote :

OK, apart from the dbus denying in #98 which helps with the turning fully on when the screen locks, in order to avoid the backlight turning on during boot time, you need to mask (it cannot be disabled) the systemd-backlight@leds\:dell\:\:kbd_backlight service:

sudo systemctl mask systemd-backlight@leds\:dell\:\:kbd_backlight.service

Hope it helps until a proper fix is released.