Disable bluetooth:
/usr/sbin/rfkill block bluetooth
Set screen brightness:
/bin/echo 50 > /sys/class/backlight/intel_backlight/brightness
Disable bluetooth:
sudo systemctl disable bluetooth.service
Screen brightness level and keyboard LED status are saved/restored automatically at shutown/startup via systemd-backlight.service
. These services should be enabled:
sudo systemctl status systemd-backlight@*