09-25-2011 04:35 AM - edited 09-25-2011 01:26 PM
Hello, I am new to this forum and wish you all a happy autumn in the northern hemisphere, and a happy spring in the southern hemisphere.
Anyway, I found this forum when I was googling solutions to my problem.
My problem is, I have a good (old) lenovo X200(7458) but recently the networking part of it became quite faulty.
Currently I live in a guesthouse of my company and they only provides wired network connection there.
The ethernet controller of my X200 is Intel 82567LM (well, at least this is what was being recognized by Windows).
When my X200 is running Windows 7 Pro 64-bit, sometimes the wired connection will be dropped and a "unidentified network" would come out, all of a sudden when I was using it (the network used to work fine).
After days of observation, this sudden drop of network seem to have no particular patterns or time, it drops randomly, disregarding the "on time" and "packets received".
What's worse is if the connection is lost and an "unidentified network" was found, even simple reboot cannot bring the network connectivity back...
When the connection is lost, I have tried to "pint 192.168.1.1" (which is the ip of the modem) and sometimes it says request time-out sometimes it says destination unreachable. This however should not be the problem of the modem, because even if I use another port of the modem, the problem remains (while my flatmate can access the internet using the same modem without any difficulties).
I have done some googling about the problem, and seems many people have experienced this problem.
I have tried almost all the suggestions found on the internet but none of them worked for me.
These suggestions includes:
1. disable IPv6
2. "ipconfig /release"; "ipconfig /renew"
3. update the driver to the latest edition
4. hardcode the default gateway and DNS instead of using DHCP
5. replace the CAT cable
6. reset IP with "netsh int ip reset c:\resetlog.txt" (not a direct solution but with the reset and several rebooting, sometimes the connectivity will come back... )
And since I do not own any Apple products and I never use iTunes, I do not have the infamous "Bonjour service" on my computer.
I have also tested if it has something to do with the wireless network but seems it's not relevant. I kept my Intel 5100AGN (built-in) off yesterday and today but I got my wired connection lost like before.
I suspect that this might be a hardware problem instead of a software one but that cannot explain why I sometimes can keep online for ten to fifteen hours without any interrupts. Moreover the network seems to be more stable on my Ubuntu 11.04 (sometimes it cannot get connected as well but if it got connected, 90% of time it won't drop the connection).
If you have any suggestions or knowledge about this problem, please help. I really need the internet to work. Keep losing the connectivity is frustrating and post a direct damage on my productivity.
09-18-2012 02:30 AM
I had same problems with my two Lenovo x200 Laptops. After several days experiment, I found the cause & solution finally. The problem is caused by Intel's AMT (http://downloadmirror.intel.com/20921/eng/Intel(R)
Warning: after disable the Intel ME, remember not to re-enable it in BIOS, otherwise, Lenovo x200 BIOS will complain and cause some errors to your x200 BIOS, then your laptop will refuse to boot (black screen, no any response except the battery & Power LED lighting). If you had done so and this happened to you, i.e., your laptop won't boot, please do following:
1. Power off your laptop;
2. remove battery from your laptop and disconnect power supply;
3. disassemble your laptop and find the BIOS battery;
4. disconnect the BIOS battery;
5. push down the Power On button for at least 5 seconds;
6. after done this, reconnect BIOS battery and reassemble your laptop.
7. connect the power or battery, power on it, your Laptop will reboot again.