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bsuggsx
Blue Screen Again
Posts: 3
Registered: ‎08-13-2019
Location: US
Views: 123
Message 1 of 3

X1 Yoga 2nd Gen (20JG) - EM7455 Constantly Drops Connectivity

We have a number of X1 Yoga 2nd Gen (20JG) w/ EM7455 LTE cards. We have updated all drivers on some machines but we continue to have issues w/ the card at time dropping connectivity to LTE and it not returning until a reboot or a disable/enable of the LTE card.

When the connectivity hangs you are unable to ping any IP addresses.

 

This occurs randomly but is seen within an hour of waking up from a sleep. 

 

Lastest driver as of July 29, 2019 has helped some but not fixed the problem. We have tested newer firmware version for Verizon but in those cases when the connectivity issues happen the entire card resets itself losing connectivity anyway.

 

We have tested on Windows 10 1803 and 1903 w/ similar results.

 

Any suggestions would be appreciated. 

bsuggsx
Blue Screen Again
Posts: 3
Registered: ‎08-13-2019
Location: US
Views: 77
Message 2 of 3

Re: X1 Yoga 2nd Gen (20JG) - EM7455 Constantly Drops Connectivity

To recreate we do the following.

 

1. Unplug laptop, login, and have cellular enabled and in-use.

2. Sleep machine and close lid for 30mins.

3. Wake machine and login

      - We have a script running connection test against external sites.

4. Card will work between 10-30mins before crashing.

 

bsuggsx
Blue Screen Again
Posts: 3
Registered: ‎08-13-2019
Location: US
Views: 44
Message 3 of 3

Re: X1 Yoga 2nd Gen (20JG) - EM7455 Constantly Drops Connectivity

Current workaround is to disable Selective Suspend for the Sierra Wireless Card

 

Open Device Manager and expand Network Adapters.

Right click on the EM7455 card and choose Properties.

Click on the Advanced tab.

Change the Selective Suspend option to Disabled.  Click Ok and reboot.

 

You can also use powershell to disable it.

Disable-NetAdapterPowerManagement -Name <ConnectionName or Variable> -SelectiveSuspend

And we're back...

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