I installed Ubuntu 12.04 LTS on my Thinkpad x220.

When I connect to a wireless network, the network speed starts out normal. But after a certain period of time (say, 10 minutes), the network speed progressively slows down. Eventually it disconnects completely, and I cannot even ping the router.

Why could this be happening? I have only had this problem with 12.04.

2 Answers 2


Try creating a file /etc/modprobe.d/iwlwifi-11n-disable with the following content and then rebooting.

options iwlwifi 11n_disable=1

Also read the following bug reports to see if you have the same symptoms.


This is happening on my lenovo u310 with Ubuntu LTS 12.04 as well. Any help would be very appreciated.

The only thing is that, I had tried to uninstall chromium browser completely, so after using synaptic package manager to uninstall packages, I had deleted chrome folders from AppData/local ans AppData/roaming. After that wifi crawls to a stop on any network in a few minutes.

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