Thursday, March 15, 2012

T500+ubuntu 11.10 = slow wifi network access

News, November 2012: 

The problem described below went away with the upgrade to Ubuntu 12.10 (Linux kernel 3.5).  Thank goodness, and high time.
 
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There's a bug between the Thinkpad T500 and wireless n transmission.

Bug discussion here, fix here, thanks to Damon:

sudo rmmod iwlagn
sudo echo "options iwlagn 11n_disable=1" > /etc/modprobe.d/disable11n.conf
sudo modprobe iwlagn


5 comments:

  1. On upgrade to Precise Pangolin, 12.04, I had to change iwlagn to iwlwifi, as per
    https://bugs.launchpad.net/ubuntu/+source/linux/+bug/836250/com

    ReplyDelete
    Replies
    1. The end of the URL seems missing....

      Delete
    2. apologies - just omit the final "com".

      Delete
  2. This suggestion about disabling power management might be worth trying:

    https://bugs.launchpad.net/ubuntu/+source/linux/+bug/836250/comments/210

    ReplyDelete
  3. ... that says:

    "I've noticed an improvement by turning power
    management off:

    /sbin/iwconfig wlan0 power off

    If this works for you, put it in a file in /etc/pm/power.d to make it
    permanent."

    ReplyDelete