howto power tune your laptop:

     upower -d
     upower -d | more
   
check for bluetooth/webcam modules:   
   
     lsmod | grep bt
     lsmod | grep uvc
   
remove them:    
   
     modprobe -r btusb
     modprobe -r uvcvideo
     echo "modprobe -r uvcvideo" >> /etc/rc.local
     echo "modprobe -r btusb" >> /etc/rc.local
  
install nvidia drivers:  
   
     add-apt-repository ppa:graphics-drivers/ppa
     apt update
     apt dist-update
     apt dist-upgrade
     apt install nvidia-390
        
enable Linux laptop mode:        
        
     echo 5 > /proc/sys/vm/laptop_mode 
     echo "echo 5 > /proc/sys/vm/laptop_mode" >> /etc/rc.local 
     cat /proc/sys/vm/laptop_mode 
  
select your Graphics driver of your choice:  
  
     sudo prime-select intel
     sudo prime-select select
     sudo prime-select query
     upower -d
     
     root@ger-xiaomi:~# upower -d | grep rate
     energy-rate:         5,61478 W
     History (rate):
     energy-rate:         5,61478 W