Wifi problems after restart or suspend

Question

when I restart or suspend my machine I suddenly cannot connect to my wifi network, what I read on other posts is to use this line code:

sudo killall NetworkManager

This help when I'm just using my wireless network, but when I'm with the cable the network icon change and try to find the cable network.

Answer 1

I will have to investigate further to find an automatic solution, but this problem occasionally happens to me as well.

The solution I use is to run

sudo restart NetworkManager

This restarts network manager cleanly and re-establishes any connections you had.

There was a bug in older Ubuntu systems where this would occur and you had to add a command to one of the files uses by pm-utils, but it seems this problem is not exactly the same as the previous one.

Answer 2

This seems a rather frequent problem even in Loki and ubuntu 16.04: 16.04 LTS wifi connection issues and it happened very often on my system.

After following this answer it got less frequent I guess.

What it says is:

1. Get details of your PCI wireless card by running sudo lshw -class network
2. Get your card model info according to the product line. For instance, as you can see in the question description it says product: RTL8723BE PCIe Wireless Network Adapter so the model of my card is RTL8723BE
3. Open or create /etc/pm/config.d/config and add SUSPEND_MODULES="rtl8723be"(replace rtl8723be with your own model number) Then run echo "options rtl8723be fwlps=N" | sudo tee /etc/modprobe.d/rtl8723be.conf and reboot.

It rarely happens now and when it does I use the command service network-manager restart.

That can be associated with a shortcut key. I prefer a desktop launcher to run from Slingshot:

gedit ~/.local/share/applications/restart_wifi.desktop

with:

[Desktop Entry]
Icon=urserver
Name=Restart Wifi
Type=Application
Exec=bash -c 'service network-manager restart'
Categories=Network;