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11 Posts

01-28-2018

PL

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  • Posts: 11
  • Registered: ‎01-28-2018
  • Location: PL
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  • Message 61 of 62

Re: T440s, major WiFi and Bluetooth instability

2018-09-06, 14:45 PM

I had a similar problem with T440 / Win10. Wifi disconnected at different times. An asterisk is displayed next to the wifi icon. I have not found direct solution to this problem. Updating drivers etc. does not help. Things from forums and this list also did not help. https://support.lenovo.com/us/en/solutions/ht502846

I solved the problem by creating a script "reconnect_to_wifi.bat"

 

 

netsh wlan disconnect interface="Wi-Fi"
ping 127.0.0.1 -n 2 > nul
netsh wlan connect name="your_wifi_name_here"
exit 0

then i run Events Viewer, navigate to Application and Services>Microsoft>Windows>NetworkProfile>Operational

 

look for event with ID 10001, right click on it, and select Attach Task To This Event.

 

Click next until You have Action. Select to Run your reconnect_to_wifi.bat script. Now run Task Scheduler. Enter  Task Scheduler Library>Event Viewer Tasks>enter to Your new task and:

General > select - run whether user is logged or not

Conditions > unselect - Start the task only if computer is on AC

Settings > select > Stop the task if it runs ... 1 hour

Settings > select > If the running task does not end ....

select box> stop the existings instance

 

Works for me ! :)

 

If something is not working, try to debug. Enable tasks history:

http://gujiong.blogspot.com/2010/10/task-scheduler-history-disabled-to.html

and check if task starts.

 

Note that event with ID 10001 also trigger when you disconnect the network cable. Therefore, you should turn off this task when using a network cable or implement some checking in your .bat script.

 

 

 

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11 Posts

01-28-2018

PL

31 Signins

380 Page Views

  • Posts: 11
  • Registered: ‎01-28-2018
  • Location: PL
  • Views: 380
  • Message 62 of 62

Re: T440s, major WiFi and Bluetooth instability

2018-10-28, 15:22 PM

After testing for some time it turned out that the above complicated method also causes many problems. 

 

I found a different way. In the "advanced" tab of the network card's properties I switched off the 802.11n/ac mode and forced 2.4GHz 802.11g. Now the connection is very stable. Works for three weeks. No problems. Previously I had several disconnections a day. Only downside is transfer limit to around 20mbit/s (lack of n mode). If this is not a problem for You, I recommend to try this solution.

 

 My "advanced tab" window is similar to this, except I have two items.

First "Wireless mode 802.11a/b/g" - i set it to '3. 2,4 GHz 802.11g'
Second "Wireless mode 802.11n/ac" - i set it to 'disabled'

 

 

it is possible that these network cards have problems with the n mode. (maybe in hardware?)

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