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24 Posts

05-17-2010

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X1C (7th Gen) Fibocom L850-GL WWAN / LTE repeatedly connects & disconnects

2019-12-10, 15:48 PM

Hello,

 

I own a 7th Gen Thinkpad X1 Carbon.  Everything was great until yesterday, when my Fibocom L850-GL WWAN / LTE began to repeatedly disconnect and reconnect (causing the Windows 10 noises for connecting and disconnecting hardware to occur nonstop).  I have a US T-Mobile SIM card in the SIM tray.

 

When you look on device manager, the Fibocom L850-GL will literally continually disappear and reappear, strangely with settings intact.  During the times it is connected I switched "Selective Suspend" to "disabled" and unchecked "Allow the computer to turn this device off to save power" in "Power Management."  These setting evidently remain intact when I check them. 

 

Drivers are the latest offered by Lenovo.  I've disabled, uninstalled, reinstalled, applied latest drivers, and still have the same issues. 

 

Can anyone advise?

 

Thanks

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24 Posts

05-17-2010

US

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  • Posts: 24
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  • Message 2 of 7

Re: X1C (7th Gen) Fibocom L850-GL WWAN / LTE repeatedly connects & disconnects

2019-12-10, 20:50 PM

Here is a link to a video showing what is going on.  You can see it cycle 3 times, disconnecting and reconnecting, within about a minute.  You can see the Fibocom L850-GL disappearing and reappearing in the Device Manager window. My laptop is literally doing this nonstop while powered on.

 

https://1drv.ms/v/s!Al4XMsJMaXlig8N5AFLAOYzf44RZJg?e=brCjSk

 

 

 

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24 Posts

05-17-2010

US

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  • Posts: 24
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  • Message 3 of 7

Re: X1C (7th Gen) Fibocom L850-GL WWAN / LTE repeatedly connects & disconnects

2019-12-11, 17:37 PM

Bump?  Can anyone help?  My Laptop is effectively unusable right now

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4779 Posts

04-25-2008

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Re: X1C (7th Gen) Fibocom L850-GL WWAN / LTE repeatedly connects & disconnects

2019-12-11, 17:45 PM

Hi redgrenadine, Try an Emergency Reset (use a paperclip to operate the button in the pinhole on the bottom). This often clears up interface misbehavior.

I don't work for Lenovo. I'm a crazy volunteer!
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24 Posts

05-17-2010

US

74 Signins

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  • Posts: 24
  • Registered: ‎05-17-2010
  • Location: US
  • Views: 443
  • Message 5 of 7

Re: X1C (7th Gen) Fibocom L850-GL WWAN / LTE repeatedly connects & disconnects

2019-12-11, 17:51 PM

Just did it.  Still having the issue

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24 Posts

05-17-2010

US

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  • Posts: 24
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  • Message 6 of 7

Re: X1C (7th Gen) Fibocom L850-GL WWAN / LTE repeatedly connects & disconnects

2019-12-12, 19:36 PM

Bump - can anyone from Lenovo help?

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2 Posts

12-14-2019

GB

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  • Message 7 of 7

Re: X1C (7th Gen) Fibocom L850-GL WWAN / LTE repeatedly connects & disconnects

2019-12-14, 19:22 PM

It's a firmware issue. Bios update caused me to lose my WWAN card, but I contacted Lenovo to send a new one with an updated model firmware and it was immediately detected upon installation. I've now got my new card up and running without problems.

There doesn't seem to be a way around the issue other than to do so, to my knowledge. Keep in mind that the FIbocom 850-GL only detects on Windows and not Linux due to using only PCI-E rather than USB like the 830-EB.

Just phone them up and see what they can do. They'll issue a ticket and send the new part if you're still under warranty.

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