Ubuntu – How to prevent WLAN connection from dropping permanently on a Fritz USB WLAN N stick


I have a desktop with a Fritz USB WLAN N stick and tried Ubuntu 12.04. Installation went fine and WLAN is working. However, connection drops permanent. Reconnecting manually fixes it but after a few minutes it drops again. It's connected to a Vodafone 802 box with WLAN N fix set. It seems that it works when I switch off N mode. But I need to test. Can someone confirm this issue or is there another solution?

I have another machine with 12.04 (HP 625 laptop) running where connection is stable.

Best Answer

Perhaps a dupe here. The tricks below worked for me a day but now they are again not working, irritating! So this case is not resolved at least with Thinkpad X220.

I. Generic partial solution

The tip by this article here does not solve it but makes it a bit better:

$ sudo /etc/init.d/networking restart

The fix is still missing, investigating.

II. Some Intel models

Apparently a fix by Chili555 here is

$ sudo modprobe -r iwlwifi
$ sudo modprobe iwlwifi 11n_disable=1

so send feedback to Intel to fix this stupid recurring bug, this is old! The latter apparently works for Intel Ultimate-N 6300. I tested this on X220 Lenovo Thinkpad -laptop and it worked, hopefully a lasting solution -- this makes very bad reputation to Intel as non-professional provider!

Perhaps related, a ton of material in google but hard to find the relevant

  1. Some summary of things, looks similar as my found solutions or hacks, here

  2. [BUG] The recurring bug already filled by Redhat here.

  3. [RESOLVED] Dell 1390 wireless (BCM4311) Ubuntu 12.04 no wireless icon in unity

  4. [Reported? Bug?] https://askubuntu.com/questions/142951/cannot-connect-to-wlan-with-increased-frequency

  5. [Resolved, related?] https://answers.launchpad.net/ubuntu/+source/gnome-nettool/+question/199216

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