How to fix no access point showing up at Network Manager

fixNetworkManager.txt

I am having issue with Network Manager in linux when I enable and disable my wifi through hardware switch.
All the accees points are not showing up in Network Manager, but I still connected to internet.

So here is what I do to get all access point listing issue fixed:
1. open /etc/NetworkManager/NetworkManager.conf and edit this:
     managed=true
2. open /etc/network/interfaces and add this:
     # This is a list of hotpluggable network interfaces.
     # They will be activated automatically by the hotplug subsystem.
     auto wlp3s0
     iface wlp3s0 inet dhcp



EDIT: After I set managed=true, my laptop will wait for 5min41s to startup the network interface, so don't set it
1. set managed=false
2. remove the things that you add in step 2 above
3. just "$service network-manager restart" every time you see your access points went missing.