Merge branch 'master' of https://git.webhosting.rug.nl/p216149/docs

power_laptop

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+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
+