Wifi losing connection, weak signal, Intel 7260 adapter

Question

I yesterday upgraded from Windows to Ubuntu 15.04 but I have problem with my wireless adapter Intel Corporation Wireless 7260 (rev 73). It randomly loses internet connection. Restarting adapter always helps. (same it did with Windows, except that sometimes restarting adapter didn't help).

Additionally, I have weaker connection then I had with Windows. Thank you!

Solution

You can try this option. Run in terminal

sudo tee /etc/modprobe.d/iwlwifi-opt.conf <<< "options iwlwifi 11n_disable=1"

and reboot.

If this does not help, some other options can be used.

It looks like this adapter does not work well in 802.11n mode. So disabling it improves connection.

There are some other options, that may be tuned.

power_save=0
bt_coex_active=0
swcrypto=1

You can also try to disable not all 802.11n, but partially. It can be selected by 11n_disable=2, 11n_disable=4 or 11n_disable=8 instead of 11n_disable=1.

You can apply them the same way as with 11n_disable=1. You can use any combination of these options, e.g.

sudo tee /etc/modprobe.d/iwlwifi-opt.conf <<< "options iwlwifi power_save=0 swcrypto=1"

You can enable all of them and remove one by one to test which one does the trick.

Every new setting overwrites the previous one.

To completely remove the options, remove /etc/modprobe.d/iwlwifi-opt.conf by running

sudo rm /etc/modprobe.d/iwlwifi-opt.conf

Please do not forget to comment on which options worked for you.

Explanation of the options can be found by

 modinfo iwlwifi | grep parm

Comments

[Léo Léopold Hertz 준영]

Please, specify your hardware in the body of the question. Is this Zenbook or Lenovo?

[david8]

This will disable 802.11n, right?

[Pilot6]

Yes, it will. But it is revertable. Try it first.

[david8]

Intresting, it looks, that signal is better!

[david8]

Thank you! How is it possible? Is there any solution without disabling wifi N?

[Pilot6]

I updated the answer. You can try others.

[david8]

I will try other, but probably disabling N is not a problem, since most serevrs won't let me download more then 10 Mb/s

[david8]

First - powersave, second - BT and WiFi at once, third - disabling HW encryption?

[Pilot6]

I would try as I wrote first. Powersave and encryption. If you do not use bluetooth, it is unlikely may cause problems. All use just all of them.

[Yanick Nedderhoff]

I fixed this before under Ubuntu 15.04 or maybe 14.10 by adding the line options iwlwifi 11n_disable=1 to /etc/modprobe.d/iwlwifi.conf. That didn't work anymore after the 15.10 upgrade, so I tried your solution, which seems to work. How come the filename has changed to iwlwifi-opt.conf?

[Pilot6]

File name makes no difference. You can add it to the original iwlwifi.conf. I made a new file to keep the old one.

[this.foo]

@YanickNedderhoff i only have iwlwifi.conf on 15.10 . no iwlwifi-opt.conf . BTW it works

[Pilot6]

No one has iwlwifi-opt.conf in any distro. I made a new file with this command to keep the default iwlwifi.conf.