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I am helping a friend troubleshoot her new Lenovo Yoga 2, running a fresh install of Ubuntu 14.04. She's getting kicked off of wireless networks a lot, and her connection is super slow. I'm running 14.04 on a Lenovo X1 and using the same wireless network and not having any trouble.

When I run nm-tool I see (among other things):

Capabilities:
   Speed:           54 Mb/s

She sees:

Capabilities:
   Speed:           9 Mb/s

Similarly, iwconfig shows a much slower connection for her:

hilary@hilary:~$ iwconfig
lo        no wireless extensions.
wlan0     IEEE 802.11bgn  ESSID:"Young Turnip"  
          Mode:Managed  Frequency:2.437 GHz  Access Point: 00:22:6B:87:D6:6B   
          Bit Rate=11 Mb/s   Tx-Power=16 dBm   
          Retry  long limit:7   RTS thr:off   Fragment thr:off
          Power Management:on
          Link Quality=34/70  Signal level=-76 dBm  
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:1  Invalid misc:126   Missed beacon:0

I see Bit Rate=54 Mb/s when I run iwconfig.

I spotted this question: https://askubuntu.com/questions/387922/slow-wireless-connection-on-lenovo But I'm not clear on what he's actually disabling there.

Per My wireless/WiFi connection does not work. What information is needed to diagnose the issue?, here are the full diagnostics: script results

How do we troubleshoot this?

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Amanda
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1 Answers1

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  1. Maybe it make a difference if you disable the power save options with:

    sudo iw dev wlan0 set power_save off

  2. Also you can try if it makes a difference if you disable the 11n extension with the following:

    sudo su
echo "options iwlwifi 11n_disable=1" >> /etc/modprobe.d/iwlwifi.conf

    You need to reboot after this.

You can monitor the speed with

 watch -d -c "sudo nm-tool |grep -i speed "
rubo77
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