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ilovecats
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Posts: 8
Registered: ‎12-09-2018
Location: US
Views: 1,713
Message 1 of 64

X1 Yoga 3rd Gen Crash on LTE (Fibocom L850-GL) during high speed download/heavy use

I have a X1 Yoga 3rd Gen equipped with the Fibocom L850-GL LTE modem, using a Verizon LTE sim.
 
I ran into this issue whenever I'm using the LTE connection at high speed, Windows 10 has a high chance of crashing (BSOD).
 
This can be easily reproduced by running a speed test on speedtest.net. I'm in an area with good LTE signal, and my speed on the Verizon sim can reach around 200 mbps. When running the speed test, whenever it goes past around 130mbps, it has a pretty high chance of crashing. It's almost as if the module cannot handle that speed (maybe heat/power related).
 
I'm on a clean installation of Windows 10 1809 with the latest Lenovo drivers (including the Fibocom modem) installed.
 
Anyone else is having this issue?
bianco17
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Posts: 11
Registered: ‎04-30-2018
Location: CH
Views: 1,614
Message 2 of 64

Re: X1 Yoga 3rd Gen Crash on LTE (Fibocom L850-GL) during high speed download/heavy use

I can confirm I have the same issue.

 

Same setup as you, just finished installing the Fibocom card and during my first tests I ran into exactly the same issue as you: Win 10 bluescreens 100% when I run an internet speedtest via LTE. Last thing I can see is download speed running past 100Mbps, and then boom, bluescreen.

 

Latest updates, firmware, drivers, etc.

 

Speedtests on ethernet or wifi are no problem.

 

This is really not good.

kazuki2018
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Registered: ‎09-09-2018
Location: JP
Views: 1,589
Message 3 of 64

Re: X1 Yoga 3rd Gen Crash on LTE (Fibocom L850-GL) during high speed download/heavy use

I have excatlly same issue on my X1 Yoga Gen3, after upgrading RS5, October update 2018.

I already update to new driver v2.0.1.44, but still same problems...

ilovecats
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Registered: ‎12-09-2018
Location: US
Views: 1,570
Message 4 of 64

Re: X1 Yoga 3rd Gen Crash on LTE (Fibocom L850-GL) during high speed download/heavy use

Good to know I'm not the only one. So chances are this is not my particular unit/card being defective, and hopefully it's not a hard design issue, rather a driver/firmware issue that can be fixed by a later release. However, I would not bet on Lenovo fixing this super quickly. Some users on Reddit mentioned that it took Lenovo a year to release a working firmware on a previous model Sierra LTE modem. Yikes.

 

I do wonder if this is related to W10 1809. I wiped and clean installed right away upon receiving my laptop so I did not have a chance to do any tests while on 1803. Really don't have the time to go back and forth just to diagnose this issue.

  


@ilovecatsI have excatlly same issue on my X1 Yoga Gen3, after upgrading RS5, October update 2018.

I already update to new driver v2.0.1.44, but still same problems...?

By any chance you can be certain that prior to the RS5 upgrade, the laptop did not exibit this issue? If we can be sure that it's just a matter of 1809, I won't mind just installing 1803 and stay on it till the issue is fixed.

 

 

ujda765
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Posts: 21
Registered: ‎07-14-2018
Location: US
Views: 1,559
Message 5 of 64

Re: X1 Yoga 3rd Gen Crash on LTE (Fibocom L850-GL) during high speed download/heavy use

As you said in another post, you installed wwan card and antenna by yourself?

 

So did you properly plug the tunable antenna connector into the camera module?

 

Because for LTE, a single channel download/upload speed is limited, to achieve high speed download/upload,  the wwan card must turn on Carrier Aggregation, which might need some operations on the antenna side. This might crash the OS if tunable antenna is not accessable.

ilovecats
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Posts: 8
Registered: ‎12-09-2018
Location: US
Views: 1,548
Message 6 of 64

Re: X1 Yoga 3rd Gen Crash on LTE (Fibocom L850-GL) during high speed download/heavy use

I bought mine off ebay which comes with LTE already installed. I assumed it's from factory, as I thought it'd be unlikely for the seller to install this module. Is it possible to check for sure?

 

My machine type model is 20LES27P00. I just checked under my warranty -> Machine Info, the WWAN card appears to be unmentioned, 

 

Processor: 1x Intel Core i5-8350U Processor(Core i5-8350U)
Memory: 1x 16GBLPDDR3-2133
Operating System: Windows 10 Pro 64(EN:English)
Hard Drive: 1x 512PCIeNVMeOPAL
Wireless Network: 1x Bluetooth Version 4.1
Ports: 1x RJ-45
Camera: 1x 720p HD Camera with MIC
Graphics: 1x
Monitor: Multitouch
Included Warranty: 3YR Onsite NBD
Included Service: Premier Support
 
Edit: However, I just checked https://support.lenovo.com/us/en/partslookup
I entered my serial number, and under "Parts - > As-Built", it does list the WWAN card model and "Installed 1". So I assume the card is factory installed?
 
ilovecats
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Posts: 8
Registered: ‎12-09-2018
Location: US
Views: 1,527
Message 7 of 64

Re: X1 Yoga 3rd Gen Crash on LTE (Fibocom L850-GL) during high speed download/heavy use

I ran some further tests today and interestingly, I couldn't reproduce the problem with Chrome browser. It crashes constantly with Edge browser, which is what I generally use on Laptops for better battery life, and on which I first noticed the problem.

 

Are those of you who're experencing the same issue happen to be using Edge? If so, can you try speedtest on Chrome?

bianco17
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Posts: 11
Registered: ‎04-30-2018
Location: CH
Views: 1,512
Message 8 of 64

Re: X1 Yoga 3rd Gen Crash on LTE (Fibocom L850-GL) during high speed download/heavy use

Yes, the antenna camera connector cable is installed. Actually the antenna was installed by an official service technician. But I had to redo some of the antenna cable routing when my card arrived and it turned out the antenna cables were too short because of improper routing.
bianco17
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Posts: 11
Registered: ‎04-30-2018
Location: CH
Views: 1,512
Message 9 of 64

Re: X1 Yoga 3rd Gen Crash on LTE (Fibocom L850-GL) during high speed download/heavy use

For me it crashes with any browser: Edge, Firefox, Chrome
kazuki2018
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Posts: 7
Registered: ‎09-09-2018
Location: JP
Views: 1,420
Message 10 of 64

Re: X1 Yoga 3rd Gen Crash on LTE (Fibocom L850-GL) during high speed download/heavy use

me too. It dosen't depend on any kind of web browser. Edge, Chrome, Firefox, everything. It is caused by highly big date transfer.....

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