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:
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.
Cheers,
Cristi