Laptop: Lenovo T410

OS: Linux mint 18

Kernel: 4.4.0-47-generic

Network card (output from lspci):

03:00.0 Network controller: Intel Corporation Centrino Advanced-N 6200 (rev 35)
Subsystem: Intel Corporation Centrino Advanced-N 6200 2x2 AGN
Kernel driver in use: iwlwifi
Kernel modules: iwlwifi, wl

Network manager: network-manage 1.2.2-0ubunt

If I do a fresh start with my Laptop, the wifi accesspoints do not get shown at network-manager applet. But the known network connections get connected and work.

After sudo service network-manager restart it works like a charm and the available access points are visible in network-manager applet.

Strangely enough, after fixing it with the restart of network-manager and then suspend and wake up it still works. Seems to be just the first boot up where it is a problem.

Used to work like a charm in Linux Mint 17!

How to debug?

  • 1
    After boot systemctl status NetworkManager You get a Main PID: 804 in my case 804. journalctl _PID=804 – user192526 Nov 14 '16 at 22:12
  • 1
    It is possible that nm-applet is starting before something else that it needs is started. To test, try putting a delay in the nm-applet startup file, located at /etc/xdg/autostart/nm-applet.desktop. Change the line Exec=nm-applet to Exec=sh -c "sleep 30; nm-applet" &. – Paul H. Nov 17 '16 at 21:57

Disable the power saving for your wireless card:

iw dev wlan0 set power_save off

Disable 802.11n and enable software encryption:

nano /etc/modprobe.d/iwlwifi.conf

Add the following lines:

options iwlwifi 11n_disable=1
options iwlwifi swcrypto=1

Unload the wl module:

rmmod wl
  • Seems to work! A short explanation would be nice, also for others :-) – Michael Nov 22 '16 at 12:47

On the nm bugzilla they mention this important commit. Update applet at least to 1.4.4.

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