Welcome to our peer-to-peer forums, where owners help owners. Need help now? Visit eSupport here.

English Community

ThinkPad NotebooksThinkPad: X Series Laptops
All Forum Topics
Options

52 Posts

08-08-2011

London

608 Signins

1395 Page Views

  • Posts: 52
  • Registered: ‎08-08-2011
  • Location: London
  • Views: 1395
  • Message 1 of 123

X220 3G mobile broadband problem with F5521gw

2011-10-11, 12:01 PM

Every several hours the connection drops, and without disabling and re-enabling the 3G mobile broadband F5521gw in Device Manager I am unable to re-connect.


I have tried different network operators in different areas, all the same problem regardless of signal strength.


Do I have a faulty modem?


I tried to install the latest driver from Lenovo but that doesn't seem to affect the driver version of the modem at all.


Any suggestions?

Reply
Answer
Options

2031 Posts

11-28-2007

Czech Republic

12107 Signins

124942 Page Views

  • Posts: 2031
  • Registered: ‎11-28-2007
  • Location: Czech Republic
  • Views: 124942

Re: X220 3G mobile broadband problem with F5521gw

2013-05-19, 19:42 PM

 I think I found solution that really works.

 

The disconnecting/reconnection issue has been discussed here for several months, confirmed by several customers (mostly in Europe region) without any solution. Good news is that I (hope) I finally found the solution. It is power management related issue. One of recent messages (posted by '790' 03-08-2013 06:13 PM) about Toshiba support advice with a driver installed command-line switch brought some light. I started to read about selective suspend feature of kernel drivers. Basically the idea is that the driver forces a network device to a low-power state when there is no traffic. The Ericsson driver also supports this feature but it seems to be broken. Since I don't have any documentation of the driver I started a try-and-fail approach modifying a driver related registry values that looks related ... and found one :smileyhappy:

 

My system configuration is:

X220

BIOS 1.38

Windows 7 x64 SP1

Ericsson F5521gw driver version 6.5.15

Ericsson F5521gw firmware R3B01

 

- I use Windows power manager and 'Balanced' schema. In advanced power profile settings I have:

   Wireless Adapter Settings

   + Power Saving Mode

      + On Battery: Maximum Performance

      + Plugged in: Maximum Performance

 

- In Device manager, Network adapters -> F5521gw Mobile Broadband Driver -> Properties, Power management tab I have:

  [X ] Allow the computer to turn off this device to save power

  [ ] Allow the device to wake the computer

 

Note that following registry values modification might cause damage to your system and data loss, you are doing it at your own risk !  I would strongly recommend to do backup of your data, check that you have created Windows recovery media and create restore point before continue.


The steps:

1. Run regedit.exe as an administrator

2. Locate 'HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\{36FC9E60-C465-11CF-8056-444553540000}' key

3. There will be several subkeys (on the left pane) named '0001', '0002' etc. You have to go through all of them and locate one that have value (on the right pane) name 'DriverDesc' and value 'F5521gw Mobile Broadband Device'. It should also contain value named 'EnableCR3840'

4. Locate value named 'EnableSelectiveSuspend' (on the right pane), it is supposed to have actual value 1

5. Change it to 0 (zero)

6. Close regedit

7. Restart the machine

 

After the registry value modification, the connection stays for 15+ hours a day (tested for 7 days yet) even without the continuous ping trick (before that, the connection had always dropped within few hours). Transition from 3G to 2G and back also works without a connection drop. The registry value modification might have the same impact as the driver setup command-line parameter posted by '790' but I have not tried that since the information was related to Toshiba OEM driver.

 

Another user of this forum has also confirmed it has made noticeable improvement for him. He uses newer version of the F5521gw driver 7.x for X230. So it seems to work for both 6.x and 7.x driver version.

 

Hope it helps.

 

Message to Lenovo support staff: Could you please verify this workaround and possibly provide official fix for the issue ?

__________________________________
ThinkPad (1992 - 2012): R51, X31, X220, Tablet 8.
Reply

Replies(122)
Options

2 Posts

10-11-2011

Finland

12 Signins

57 Page Views

  • Posts: 2
  • Registered: ‎10-11-2011
  • Location: Finland
  • Views: 57
  • Message 2 of 123

Re: X220 3G mobile broadband problem with F5521gw

2011-10-11, 15:30 PM
I have exactly the same problem even after replacing 3G mobile adapter with new one
Reply
Options

52 Posts

08-08-2011

London

608 Signins

1395 Page Views

  • Posts: 52
  • Registered: ‎08-08-2011
  • Location: London
  • Views: 1395
  • Message 3 of 123

Re: X220 3G mobile broadband problem with F5521gw

2011-10-12, 12:29 PM

So it's not likely a problem with the specific sample of the 3G adapter I've got?

Reply
Options

2029 Posts

12-02-2007

Australia

9435 Signins

247288 Page Views

  • Posts: 2029
  • Registered: ‎12-02-2007
  • Location: Australia
  • Views: 247288
  • Message 4 of 123

Re: X220 3G mobile broadband problem with F5521gw

2011-10-12, 23:12 PM

3G as a service offering is only semi-standardised in global terms, and local conditions (both at business and tecnology levels) have a significant impact on user experience.

 

I travel widely with 3G devices, including an F5521gw in an X220, and have found across all the devices that they may   work quite adequately in one country but may be  less than satisfactory in the next, mostly due to local variations in the way that ISPs provision their 3G services in each country.

 

Something more in terms of an issue description, beyond "it doesn't work as I expected it to", is necessary to even start considering what your problems might be! :smileysurprised:


Cheers,

 

Bill

------------------------------
I don't work for Lenovo
Reply
Options

10 Posts

09-17-2011

Australia

9 Signins

68 Page Views

  • Posts: 10
  • Registered: ‎09-17-2011
  • Location: Australia
  • Views: 68
  • Message 5 of 123

Re: X220 3G mobile broadband problem with F5521gw

2011-11-18, 1:38 AM

Hi there Thinkfly,

 

I have the same problem with my X220T and Ericsson F5521gw WWAN card. I posted a message on the X220T forums a few weeks ago without any resolution.

 

http://forums.lenovo.com/t5/X-Series-Tablet-ThinkPad-Laptops/Ericsson-F5521gw-WWAN-disconnects-intermittently-and-cannot/m-p/565597

 

I have also sent my laptop back to Lenovo and had the WWAN card swapped, however it did not resolve the issue. I am in Australia. I've tried this with "3" and "Telstra". Telstra works better than 3, however both disconnect after a few hours & cannot reconnect without turning the computer off/on. I don't mind so much that the WWAN disconnects, but more annoying is the fact that I cannot reconnect without turning the computer off / on.

 

Interestingly, a guy from Germany with an HP laptop and an Ericsson F5521gw has the same problem and had his WWAN card changed, without any resolution.

 

Cheers,

 

Bob12345

 

 

Reply
Options

13 Posts

10-22-2011

Germany

128 Signins

344 Page Views

  • Posts: 13
  • Registered: ‎10-22-2011
  • Location: Germany
  • Views: 344
  • Message 6 of 123

Re: X220 3G mobile broadband problem with F5521gw

2011-11-21, 17:24 PM

Try opening a DOS-box and type "ping www.google.com -t" to generate some sort of keepalive traffic. That will keep the connection from being dropped because it's idle - that's the only way I figured out to keep a stable WWAN connection.

Cheers,

mark23

Reply
Options

99 Posts

05-13-2011

Denmark

753 Signins

2232 Page Views

  • Posts: 99
  • Registered: ‎05-13-2011
  • Location: Denmark
  • Views: 2232
  • Message 7 of 123

Re: X220 3G mobile broadband problem with F5521gw

2011-11-22, 11:14 AM

Friday and saturday last week i was attending a course and wanted to test the stability of the WAN connection since it seems that some people have issues.

The connection was running about 6 hours both days, and i didn't notice any drop-outs.  The mail was also running, polling the mail-server each minute.

/Henrik - Denmark
X220 - i7-2620, 8GB, 128GB Samsung 830 SSD (I just LOVE my X220!) - and still after 6 years of service, running Win10 like a charm!
Reply
Options

2029 Posts

12-02-2007

Australia

9435 Signins

247288 Page Views

  • Posts: 2029
  • Registered: ‎12-02-2007
  • Location: Australia
  • Views: 247288
  • Message 8 of 123

Re: X220 3G mobile broadband problem with F5521gw

2011-11-23, 1:36 AM

wrote:

Telstra works better than 3, however both disconnect after a few hours & cannot reconnect without turning the computer off/on. I don't mind so much that the WWAN disconnects, but more annoying is the fact that I cannot reconnect without turning the computer off / on. 

 


I have an X220 with a F5521gw, runnig on Win 7 x64, and it holds up a post-paid Telstra Mobile Broadband NextG connection for several hours (day long businesss workshops) without any issues.

 

Have you checked the power management option in the device driver for the WWAN card?  If it is enabled, you might want to try it disabling it.

 

Cheers,

 

Bill

------------------------------
I don't work for Lenovo
Reply
Options

99 Posts

05-13-2011

Denmark

753 Signins

2232 Page Views

  • Posts: 99
  • Registered: ‎05-13-2011
  • Location: Denmark
  • Views: 2232
  • Message 9 of 123

Re: X220 3G mobile broadband problem with F5521gw

2011-11-25, 6:51 AM

Despite my former post, i actually had problems yesterday.  3 times during the evening, i lost connection (eventhough the signal was fine) and it wasn't possible to re-connect until i rebooted the X220.

I will try again today ....... the driver is Ericsson 13/4-2011 5.28.4.0 (i use automatic update from Lenovo, so i guess it is the latest)

/Henrik - Denmark
X220 - i7-2620, 8GB, 128GB Samsung 830 SSD (I just LOVE my X220!) - and still after 6 years of service, running Win10 like a charm!
Reply
Options

10 Posts

09-17-2011

Australia

9 Signins

68 Page Views

  • Posts: 10
  • Registered: ‎09-17-2011
  • Location: Australia
  • Views: 68
  • Message 10 of 123

Re: X220 3G mobile broadband problem with F5521gw

2011-11-30, 2:46 AM

Can the people who haven't noticed problems so far try this?

 

1. Connect to 3G internet through Ericsson WWAN card.

2. While connected to the internet, carry the X220 somewhere with no reception e.g. into the basement levels and wait for it to disconnect.

3. Bring it back to ground level and try to reconnect

 

Does it reconnect or does it require power off/on cycle?

 

For me, it does require power off/on if I go through these steps.

Reply
Forum Home

Community Guidelines

Please review our Guidelines before posting.

Learn More

Check out current deals!

Go Shop
X

Save

X

Delete

X

No, I don’t want to share ideas Yes, I agree to these terms