View Full Version : [SOLVED] ThinkPad X220 with Intel Centrino N 1000 WiFi - SLOW

July 16th, 2011, 04:40 AM
I just did a clean install of Xubuntu 11.04 on a ThinkPad X220 with an Intel Centrino Wireless-N 1000 WiFi card, and my download speeds never exceed 50 kB/s on a great connection, where my other laptops get ~1 MB/s down.

Any ideas? This is absolutely killing me. I just spent over $1000 on this laptop!

July 16th, 2011, 04:50 AM

Apparently, this WiFi card screws up on Linux when "N" network support is enabled. Disable N network support, and it works beautifully. To do so, do the following:

sudo vi /etc/modprobe.d/iwlagn.conf

Add the following line to this file (which was probably empty before):

options iwlagn 11n_disable50=1 11n_disable=1

Be happy.

January 16th, 2012, 10:52 PM
In my case (x220 i5) the fix breaks wireless completely. The interface disappears.

Is there a better set of drivers?

By the way on Ubuntu 11.10:

$ uname -a
Linux sawtooth-x220l 3.0.0-14-generic-pae #23-Ubuntu SMP Mon Nov 21 22:07:10 UTC 2011 i686 i686 i386 GNU/Linux

January 29th, 2012, 01:31 PM
The Intel Centrino N 1000 didn't work for me. I disabled N, installed wicd, and got reasonable use out of it for only short periods.

Because of the lenovo bios whitelist for approved wireless mini-pcie cards, you can't just upgrade the hardware to something that works

Check out the thinkwiki wiki page about it the wireless-n 1000

If there is no software fix on the horizon and you must get it working, then try using a lenovo approved Intel centrino N-6205 from ebay or a reseller you trust that guarentees the device will be 'whitelisted' in the bios