WiFi randomly turning off or disconnecting (lenovo t540p, Ubuntu 14.04)

Question

I installed Ubuntu 14.04 on my lenovo t540p. Everything is working good, however, the wireless keeps turning off or disconnecting from time to time.

This is my iwconfig:

eth0      no wireless extensions.

lo        no wireless extensions.

wlan0     IEEE 802.11abgn  ESSID:"tanquetao"  
          Mode:Managed  Frequency:2.437 GHz  Access Point: 14:CF:E2:0D:88:30   
          Bit Rate=144.4 Mb/s   Tx-Power=22 dBm   
          Retry  long limit:7   RTS thr:off   Fragment thr:off
          Power Management:on
          Link Quality=44/70  Signal level=-66 dBm  
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:66  Invalid misc:1324   Missed beacon:0

I would appreciate if anybody had some advice on how to fix this issue.

Solution

Disable Power Management

1. Bring interface down.

   sudo ifconfig wlan0 down
   

2. Disable Power Management.

   sudo iwconfig wlan0 power off
   

3. Bring the interface up again.

   sudo ifconfig wlan0 up
   

4. If it works, make it permanent by putting it into script or through pm-utils.

Disable n

If you have intel type of wireless card, you might want to try disabling n-wireless.

Comments

[David Foerster]

Please run the WiFi diagnostics and edit your question to include a link to its results.

[Fabby]

Any feed-back on the requests?

[Gustavo B Paterno]

Thanks for your reply! It did improved my internet concections. I also updated my kernel to the last version. Cheers